Sample records for geophysical drill cores

  1. Preliminary Fracture Description from Core, Lithological Logs, and Borehole Geophysical Data in Slimhole Wells Drilled for Project Hotspot: the Snake River Geothermal Drilling Project

    NASA Astrophysics Data System (ADS)

    Kessler, J. A.; Evans, J. P.; Shervais, J. W.; Schmitt, D.

    2011-12-01

    The Snake River Geothermal Drilling Project (Project Hotspot) seeks to assess the potential for geothermal energy development in the Snake River Plain (SRP), Idaho. Three deep slimhole wells are drilled at the Kimama, Kimberly, and Mountain Home sites in the central SRP. The Kimama and Kimberly wells are complete and the Mountain Home well is in progress. Total depth at Kimama is 1,912 m while total depth at Kimberly is 1,958 m. Mountain Home is expected to reach around 1,900 m. Full core is recovered and complete suites of wireline borehole geophysical data have been collected at both Kimama and Kimberly sites along with vertical seismic profiles. Part of the geothermal assessment includes evaluating the changes in the nature of fractures with depth through the study of physical core samples and analysis of the wireline geophysical data to better understand how fractures affect permeability in the zones that have the potential for geothermal fluid migration. The fracture inventory is complete for the Kimama borehole and preliminary analyses indicate that fracture zones are related to basaltic flow boundaries. The average fracture density is 17 fractures/3 m. The maximum fracture density is 110 fractures/3 m. Fracture density varies with depth and increases considerably in the bottom 200 m of the well. Initial indications are that the majority of fractures are oriented subhorizontally but a considerable number are oriented subvertically as well. We expect to statistically evaluate the distribution of fracture length and orientation as well as analyze local alteration and secondary mineralization that might indicate fluid pathways that we can use to better understand permeability at depth in the borehole. Near real-time temperature data from the Kimama borehole indicate a temperature gradient of 82°C/km below the base of the Snake River Plain aquifer at a depth of 960 m bgs. The measured temperature at around 1,400 m depth is 55°C and the projected temperature at 2,000 m depth is 102°C. The rock types at Kimama and Kimberly are primarily basalt and rhyolite, respectively, with interbedded thin sedimentary layers. We identify anomalies in the physical properties of igneous rocks using porosity logs (neutron and acoustic), lithology logs (gamma ray and magnetic susceptibility) and fracture/saturation logs (televiewer and electrical resistivity). The core will be used to constrain the geophysical data and confirm the ability to identify permeability in fracture zones and saturated zones through analysis of the wireline log data. The matrix porosity of these igneous lithologies is near zero aside from porosity from vugs and vesicles. However, open and sealed fractures indicate that mineralizing fluids form connected pathways in the rock. Core samples show a series of alteration phases, including amygdaloidal fine-grained calcite and secondary clays. The geophysical data will be used to predict anomalies in lithology and identify open fractures and saturated zones with high permeability.

  2. HYDRATE CORE DRILLING TESTS

    SciTech Connect

    John H. Cohen; Thomas E. Williams; Ali G. Kadaster; Bill V. Liddell

    2002-11-01

    The ''Methane Hydrate Production from Alaskan Permafrost'' project is a three-year endeavor being conducted by Maurer Technology Inc. (MTI), Noble, and Anadarko Petroleum, in partnership with the U.S. DOE National Energy Technology Laboratory (NETL). The project's goal is to build on previous and ongoing R&D in the area of onshore hydrate deposition. The project team plans to design and implement a program to safely and economically drill, core and produce gas from arctic hydrates. The current work scope includes drilling and coring one well on Anadarko leases in FY 2003 during the winter drilling season. A specially built on-site core analysis laboratory will be used to determine some of the physical characteristics of the hydrates and surrounding rock. Prior to going to the field, the project team designed and conducted a controlled series of coring tests for simulating coring of hydrate formations. A variety of equipment and procedures were tested and modified to develop a practical solution for this special application. This Topical Report summarizes these coring tests. A special facility was designed and installed at MTI's Drilling Research Center (DRC) in Houston and used to conduct coring tests. Equipment and procedures were tested by cutting cores from frozen mixtures of sand and water supported by casing and designed to simulate hydrate formations. Tests were conducted with chilled drilling fluids. Tests showed that frozen core can be washed out and reduced in size by the action of the drilling fluid. Washing of the core by the drilling fluid caused a reduction in core diameter, making core recovery very difficult (if not impossible). One successful solution was to drill the last 6 inches of core dry (without fluid circulation). These tests demonstrated that it will be difficult to capture core when drilling in permafrost or hydrates without implementing certain safeguards. Among the coring tests was a simulated hydrate formation comprised of coarse, large-grain sand in ice. Results with this core showed that the viscosity of the drilling fluid must also be carefully controlled. When coarse sand was being cored, the core barrel became stuck because the drilling fluid was not viscous enough to completely remove the large grains of sand. These tests were very valuable to the project by showing the difficulties in coring permafrost or hydrates in a laboratory environment (as opposed to a field environment where drilling costs are much higher and the potential loss of equipment greater). Among the conclusions reached from these simulated hydrate coring tests are the following: Frozen hydrate core samples can be recovered successfully; A spring-finger core catcher works best for catching hydrate cores; Drilling fluid can erode the core and reduces its diameter, making it more difficult to capture the core; Mud must be designed with proper viscosity to lift larger cuttings; and The bottom 6 inches of core may need to be drilled dry to capture the core successfully.

  3. Ultrasonic Drilling and Coring

    NASA Technical Reports Server (NTRS)

    Bar-Cohen, Yoseph

    1998-01-01

    A novel drilling and coring device, driven by a combination, of sonic and ultrasonic vibration, was developed. The device is applicable to soft and hard objects using low axial load and potentially operational under extreme conditions. The device has numerous potential planetary applications. Significant potential for commercialization in construction, demining, drilling and medical technologies.

  4. Creating Classroom Activities About Ocean Drilling Geophysics Through Scientist-Teacher Collaboration

    Microsoft Academic Search

    M. J. Passow; G. Guerin

    2007-01-01

    How can examples of geophysical data used in research be effectively taught to middle and high school students with only general science knowledge? Logging data, or logs, are continuous measurements of physical properties made in situ and at high resolution by lowering instruments into boreholes after completion of coring. As part of the Integrated Ocean Drilling Program (IODP) \\

  5. Integrated deep drilling, coring, downhole logging, and data management in the Chicxulub Scientific Drilling Project (CSDP), Mexico

    Microsoft Academic Search

    Lothar Wohlgemuth; Eckhard Bintakies; Jochem Kück; Ronald Conze; Ulrich Harms

    2004-01-01

    Impact structures in the solar system are mainly recognized and explored through remote sensing and, on Earth, through geophysical deep sounding. To date, a continuous scientific sampling of large impact craters from cover rocks to target material has only seldom been performed. The first project to deep-drill and core into one of the largest and well-preserved terrestrial impact structures was

  6. Downhole geophysical data from recent deep drilling in the center of the Thuringian Basin, Germany

    NASA Astrophysics Data System (ADS)

    Methe, Pascal; Goepel, Andreas; Kukowski, Nina

    2014-05-01

    In the framework of the INFLUINS (Integrated Fluid Dynamics in Sedimentary Basins) project, a 1.179 meter deep scientific borehole was drilled in summer 2013. The drill site is situated in the north of Erfurt, in the center of the Thuringian Basin on the crossing point of two seismic reflection profiles, which were acquired in 2011. An almost complete sequence from Keuper to the base of the Buntsandstein was drilled. Drilling, geophysical measurements and well construction were conducted for three depth intervals. First, drilling was undertaken to a depth of 313 m down to the top of the Middle Muschelkalk. Then, the Middle and Upper Muschelkalk were drilled to a depth of 515 m and the third part of the drilling campaign was finished at a depth of 1.179 m at the base of the Lower Buntsandstein. Coring was done in the depth intervals of 285 m to 420 m and 520 m to 914 m. With the help of the borehole geophysical measurements, which were done along the entire depth, stratigraphic information obtained through core samples can be extrapolated from cored sections into those depth sections, where no coring was done. Immediately after finishing drilling through a certain depth interval, borehole geophysical measurements were conducted in the open hole. Using the caliper and inclination instruments, the geometry of the well was determined. In addition, milieu, gamma-ray, spectral gamma-ray, acoustic borehole television, sonic, susceptibility, dipmeter, gamma-gamma, neutron-neutron and the dual latero-log were measured to get information about rock properties. Within rock-salt bearing depth intervals, embedded cm-thin layers of clay can be geophysically resolved. This will e.g. enable to determine and contrast the physical properties of these alternating sequences with high accuracy. Besides the in-situ well measurements rock-physical parameters of the core samples were acquired with a Multi-Sensor Core Logger (MSCL). Here, we present the new data set and discuss some preliminary results. Unexpectedly and contrary to them being prominent aquifers, like at the edges of the Thuringian Basin, the Middle Muschelkalk and Middle Buntsandstein sequences are characterized by very low porosities and no macroscopically recognizable fluid transport here.

  7. Test report for core drilling ignitability testing

    SciTech Connect

    Witwer, K.S.

    1996-08-08

    Testing was carried out with the cooperation of Westinghouse Hanford Company and the United States Bureau of Mines at the Pittsburgh Research Center in Pennsylvania under the Memorandum of Agreement 14- 09-0050-3666. Several core drilling equipment items, specifically those which can come in contact with flammable gasses while drilling into some waste tanks, were tested under conditions similar to actual field sampling conditions. Rotary drilling against steel and rock as well as drop testing of several different pieces of equipment in a flammable gas environment were the specific items addressed. The test items completed either caused no ignition of the gas mixture, or, after having hardware changes or drilling parameters modified, produced no ignition in repeat testing.

  8. Barberton drilling project - Buck Reef Chert core BARB3

    NASA Astrophysics Data System (ADS)

    Hofmann, Axel; Karykowski, Bartosz; Mason, Paul; Chunnet, Gordon; Arndt, Nick

    2013-04-01

    As part of the ICDP-sponsored Barberton drilling project a single drill core (BARB3) with a total length of 899 m was obtained from the c. 3.4 Ga old Buck Reef Chert (BRC). The BRC is an unusually thick (up to 350 m) sequence of predominantly black-and-white banded chert and banded ferruginous chert that are steeply dipping. It overlies a shallow intrusive to extrusive sequence of dacitic volcanic rocks of the Hooggenoeg Formation and is separated from ultramafic lapillistone of the Kromberg Formation by a >150 m thick ultramafic sill. Drilling commenced in the ultramafic sill at an angle of c. 45° and c. 200 m of serpentinized peridotite were intersected. The remaining c. 700 m of the core include a great variety of chert lithofacies and minor intrusive mafic to intermediate igneous rocks. The base of the BRC was not intersected. Geophysical logging was done up to a depth of 847 m and included acoustic televiewer, gamma ray, resistivity, magnetic field and caliper logs. Stratigraphic and geophysical logs will be presented that will form the basis of follow-up studies on the BARB3 core. Abundance of organic matter, sulphides and Fe-bearing carbonates in specific intervals or associated with specific facies of the chert succession reflect changes in the oceanic, environmental and/or hydrothermal conditions in a shallow marine early Archaean setting. Evaluating the different processes will require a combined sedimentological, mineralogical, and geochemical approach that will provide insights into the habitat of early life, geochemical cycles and marine/hydrothermal conditions.

  9. Drilling Active Faults in Northern Europe: Geological and Geophysical Data Sets on Postglacial Faults in Finland

    NASA Astrophysics Data System (ADS)

    Kukkonen, I. T.

    2011-12-01

    Postglacial faults represent a special type of intraplate earthquake-generating faults which were formed at the late stages of or immediately after the Weichselian glaciation in northern Europe at about 9000 - 15 000 years B.P. In northern Finland, Sweden and Norway 14 postglacial faults are known with fault scarps up to 30 m high and up to 160 km long. The faults are mostly interpreted as SW-NE oriented thrust faults dipping 30-50° SE. Many of the faults are still seismically active, indicating that the structures may have a significant role in releasing seismic energy in the otherwise seismically quiet continental area. In Finland, four postglacial faults are known, the Suasselkä (fault scarp length 50 km), Pasmajärvi (5 km), Venejärvi (10 km) and Ruostejärvi (4 km) faults. The scarp heights of these faults range from 0 to 12 m. The ICDP drilling project DAFNE (Drilling into Active Faults in Northern Europe) is currently under preparation. The project aims at drilling 1-3 km deep research boreholes into a postglacial fault which is seismically active. The project will study the structure, tectonics, deformation, seismicity, stress field, hydrogeology, and deep biosphere of postglacial faults. The presentation reviews the postglacial faults in Finland and the status of geological and geophysical data available on the structures. Existing data and maps on Precambrian rocks and Quaternary sediments, shallow drill cores, excavation pits, low-altitude airborne magnetic, EM and radiometric data, various surface geophysical data sets, reflection seismic surveys, and seismic monitoring of the faults are discussed with a particular view on surveying for potential drilling targets.

  10. Scientific Drilling of Impact Craters - Well Logging and Core Analyses Using Magnetic Methods (Invited)

    NASA Astrophysics Data System (ADS)

    Fucugauchi, J. U.; Perez-Cruz, L. L.; Velasco-Villarreal, M.

    2013-12-01

    Drilling projects of impact structures provide data on the structure and stratigraphy of target, impact and post-impact lithologies, providing insight on the impact dynamics and cratering. Studies have successfully included magnetic well logging and analyses in core and cuttings, directed to characterize the subsurface stratigraphy and structure at depth. There are 170-180 impact craters documented in the terrestrial record, which is a small proportion compared to expectations derived from what is observed on the Moon, Mars and other bodies of the solar system. Knowledge of the internal 3-D deep structure of craters, critical for understanding impacts and crater formation, can best be studied by geophysics and drilling. On Earth, few craters have yet been investigated by drilling. Craters have been drilled as part of industry surveys and/or academic projects, including notably Chicxulub, Sudbury, Ries, Vredefort, Manson and many other craters. As part of the Continental ICDP program, drilling projects have been conducted on the Chicxulub, Bosumtwi, Chesapeake, Ries and El gygytgyn craters. Inclusion of continuous core recovery expanded the range of paleomagnetic and rock magnetic applications, with direct core laboratory measurements, which are part of the tools available in the ocean and continental drilling programs. Drilling studies are here briefly reviewed, with emphasis on the Chicxulub crater formed by an asteroid impact 66 Ma ago at the Cretaceous/Paleogene boundary. Chicxulub crater has no surface expression, covered by a kilometer of Cenozoic sediments, thus making drilling an essential tool. As part of our studies we have drilled eleven wells with continuous core recovery. Magnetic susceptibility logging, magnetostratigraphic, rock magnetic and fabric studies have been carried out and results used for lateral correlation, dating, formation evaluation, azimuthal core orientation and physical property contrasts. Contributions of magnetic studies on impact age, cratering, target-impactite stratigraphy, ejecta, impact dynamics, hydrothermal alterations and post-impact processes are presented. The challenges and perspectives of drilling studies of impact craters are discussed.

  11. Concepts and Benefits of Lunar Core Drilling

    NASA Technical Reports Server (NTRS)

    McNamara, K. M.; Bogard, D. D.; Derkowski, B. J.; George, J. A.; Askew, R. S.; Lindsay, J. F.

    2007-01-01

    Understanding lunar material at depth is critical to nearly every aspect of NASA s Vision and Strategic Plan. As we consider sending human s back to the Moon for brief and extended periods, we will need to utilize lunar materials in construction, for resource extraction, and for radiation shielding and protection. In each case, we will be working with materials at some depth beneath the surface. Understanding the properties of that material is critical, thus the need for Lunar core drilling capability. Of course, the science benefit from returning core samples and operating down-hole autonomous experiments is a key element of Lunar missions as defined by NASA s Exploration Systems Architecture Study. Lunar missions will be targeted to answer specific questions concerning lunar science and re-sources.

  12. ROPEC - ROtary PErcussive Coring Drill for Mars Sample Return

    NASA Technical Reports Server (NTRS)

    Chu, Philip; Spring, Justin; Zacny, Kris

    2014-01-01

    The ROtary Percussive Coring Drill is a light weight, flight-like, five-actuator drilling system prototype designed to acquire core material from rock targets for the purposes of Mars Sample Return. In addition to producing rock cores for sample caching, the ROPEC drill can be integrated with a number of end effectors to perform functions such as rock surface abrasion, dust and debris removal, powder and regolith acquisition, and viewing of potential cores prior to caching. The ROPEC drill and its suite of end effectors have been demonstrated with a five degree of freedom Robotic Arm mounted to a mobility system with a prototype sample cache and bit storage station.

  13. Geophysical investigations in deep horizontal holes drilled ahead of tunnelling

    USGS Publications Warehouse

    Carroll, R.D.; Cunningham, M.J.

    1980-01-01

    Deep horizontal drill holes have been used since 1967 by the Defense Nuclear Agency as a primary exploration tool for siting nuclear events in tunnels at the Nevada Test Site. The U.S. Geological Survey had developed geophysical logging techniques for obtaining resistivity and velocity in these holes, and to date 33 horizontal drill holes in excess of 300 m in depth have been successfully logged. The deepest hole was drilled to a horizontal depth of 1125 m. The purposes of the logging measurements are to define clay zones, because of the unstable ground conditions such zones can present to tunnelling, and to define zones of partially saturated rock, because of the attenuating effects such zones have on the shock wave generated by the nuclear detonation. Excessive attenuation is undesirable because the shock wave is used as a tunnel closure mechanism to contain debris and other undesirable explosion products. Measurements are made by pumping resistivity, sonic and geophone probes down the drill string and out of the bit into the open hole. Clay zones are defined by the electrical resistivity technique based on empirical data relating the magnitude of the resistivity measurement to qualitative clay content. Rock exhibiting resistivity of less than 20 ??-m is considered potentially unstable, and resistivities less than 10 ??-m indicate appreciable amounts of clay are present in the rock. Partially saturated rock zones are defined by the measurement of the rock sound speed. Zones in the rock which exhibit velocities less than 2450 m/sec are considered of potential concern. ?? 1980.

  14. Recent Developments and Adaptations in Diamond Wireline Core Drilling Technology

    Microsoft Academic Search

    D. M. Thomas; D. L. Nielson; B. B. Howell; M. Pardey

    2001-01-01

    Scientific drilling using diamond wireline technology is presently undergoing a significant expansion and extension of activities that has allowed us to recover geologic samples that have heretofore been technically or financially unattainable. Under the direction and management of DOSECC, a high-capacity hybrid core drilling system was designed and fabricated for the Hawaii Scientific Drilling Project (HSDP) in 1998. This system,

  15. Drilled core holes key to coalbed methane project

    SciTech Connect

    Willis, C. (River Gas Corp., Northport, AL (United States))

    1995-03-06

    An efficient system of drilling core holes for data followed by drilling, fracing, and producing gas wells helped develop economic quantities of coalbed methane. The objective of the Drunkards Wash, Utah, project is to explore for and produce commercial quantities of methane from medium-depth coal seams in east central Utah. Current gas production rates are exceeding the projections made prior to development and used for initial economic feasibility. The paper describes the coring program, drilling operations, completion practices, and production operations.

  16. An innovative optical and chemical drill core scanner

    NASA Astrophysics Data System (ADS)

    Sjöqvist, A. S. L.; Arthursson, M.; Lundström, A.; Calderón Estrada, E.; Inerfeldt, A.; Lorenz, H.

    2015-05-01

    We describe a new innovative drill core scanner that semi-automatedly analyses drill cores directly in drill core trays with X-ray fluorescence spectrometry, without the need for much sample preparation or operator intervention. The instrument is fed with entire core trays, which are photographed at high resolution and scanned by a 3-D profiling laser. Algorithms recognise the geometry of the core tray, number of slots, location of the drill cores, calculate the optimal scanning path, and execute a continuous XRF analysis of 2 cm width along the core. The instrument is equipped with critical analytical components that allow an effective QA/QC routine to be implemented. It is a mobile instrument that can be manoeuvred by a single person with a manual pallet jack.

  17. Fracture zone drilling through Atotsugawa fault in central Japan - geological and geophysical structure -

    NASA Astrophysics Data System (ADS)

    Omura, K.; Yamashita, F.; Yamada, R.; Matsuda, T.; Fukuyama, E.; Kubo, A.; Takai, K.; Ikeda, R.; Mizuochi, Y.

    2004-12-01

    Drilling is an effective method to investigate the structure and physical state in and around the active fault zone, such as, stress and strength distribution, geological structure and materials properties. In particular, the structure in the fault zone is important to understand where and how the stress accumulates during the earthquake cycle. In previous studies, we did integrate investigation on active faults in central Japan by drilling and geophysical prospecting. Those faults are estimated to be at different stage in the earthquake cycle, i.e., Nojima fault which appeared on the surface by the 1995 Great Kobe earthquake (M=7.2), the Neodani fault which appeared by the 1891 Nobi earth-quake (M=8.0), the Atera fault, of which some parts have seemed to be dislocated by the 1586 Tensyo earthquake (M=7.9), and Gofukuji Fault that is considered to have activated about 1200 years ago. Each faults showed characteristic features of fracture zone structure according to their geological and geophysical situations. In a present study, we did core recovery and down hole measurements at the Atotsugawa fault, central Japan, that is considered to have activated at 1858 Hida earthquake (M=7.0). The Atotsugawa fault is characterized by active seismicity along the fault. But, at the same time, the shallow region in the central segment of the fault seems to have low seismicity. The high seismicity segment and low seismicity segments may have different mechanical, physical and material properties. A 350m depth borehole was drilled vertically beside the surface trace of the fault in the low seismicity segment. Recovered cores were overall heavily fractured and altered rocks. In the cores, we observed many shear planes holding fault gouge. Logging data showed that the apparent resistance was about 100 - 600 ohm-m, density was about 2.0 - 2.5g/cm3, P wave velocity was approximately 3.0 - 4.0 km/sec, neutron porosity was 20 - 40 %. Results of physical logging show features of fault fracture zone that were the same as the fault fracture zones of other active faults that we have drilled previously. By the BHTV logging, we detected many fractures of which the strikes are not only parallel to the fault trace bur also oblique to the fault trace. The observations of cores and logging data indicate that the borehole passed in the fracture zone down to the bottom, and that the fracture zone has complicate internal structure including foliation not parallel to the fault trace. The core samples are significant for further investigation on material properties in the fracture zone. And we need data of geophysical prospecting to infer the deeper structure of the fracture zone.

  18. Ultrasonic/Sonic Mechanisms for Drilling and Coring

    NASA Technical Reports Server (NTRS)

    Bar-Cohen, Yoseph; Sherrit, Stewart; Dolgin, Benjamin; Askin, Steve; Peterson, Thomas M.; Bell, Bill; Kroh, Jason; Pal, Dharmendra; Krahe, Ron; Du, Shu

    2003-01-01

    Two apparatuses now under development are intended to perform a variety of deep-drilling, coring, and sensing functions for subsurface exploration of rock and soil. These are modified versions of the apparatuses described in Ultrasonic/Sonic Drill/Corers With Integrated Sensors (NPO-20856), NASA Tech Briefs, Vol. 25, No. 1 (January 2001), page 38. In comparison with the drilling equipment traditionally used in such exploration, these apparatuses weigh less and consume less power. Moreover, unlike traditional drills and corers, these apparatuses function without need for large externally applied axial forces.

  19. Selected data fron continental scientific drilling core holes VC-1 and VC-2a, Valles Caldera, New Mexico

    SciTech Connect

    Musgrave, J.A.; Goff, F.; Shevenell, L.; Trujillo, P.E. Jr.; Counce, D.; Luedemann, G.; Garcia, S.; Dennis, B.; Hulen, J.B.; Janik, C.; Tomei, F.A.

    1989-02-01

    This report presents geochemical and isotopic data on rocks and water and wellbore geophysical data from the Continental Scientific Drilling Program core holes VC-1 and VC-2a, Valles Caldera, New Mexico. These core holes were drilled as a portion of a broader program that seeks to answer fundamental questions about magma, water/rock interactions, ore deposits, and volcanology. The data in this report will assist the interpretation of the hydrothermal system in the Jemez Mountains and will stimulate further research in magmatic processes, hydrothermal alteration, ore deposits, hydrology, structural geology, and hydrothermal solution chemistry. 37 refs., 36 figs., 28 tabs.

  20. Characterization of Seismogenic Faults of Central Japan by Geophysical Survey and Drilling

    NASA Astrophysics Data System (ADS)

    Ikeda, R.; Omura, K.; Matsuda, T.

    2004-12-01

    Integrated investigations on seismogenic faults by geophysical survey and drilling are indispensable to better understand deep structure and physical properties of a fault fracture zone. In central Japan, three large active faults, Neodani, Atotsugawa and Atera faults, exist and are remarkable for research because of the potentiality of a scale of magnitude 7 to 8 class earthquake and the different characteristics of the seismogenic activities in these faults. Each individual fault shows its own characteristic features, which may reflect different stages in an earthquake cycle. High seismicity is concentrated with a clear lineation on and around the Atotsugawa fault, which is recognized as aftershocks from the latest event of the 1858 Hida earthquake (M=7.0). On the other hand, extremely low seismicity is found around the Atera fault, of which some parts seemed to be dislocated by the 1586 Tensyo earthquake (M=7.9). As an example of the results of study at the Atera fault, we obtained a wide variety of fault structures, composed materials, states of crustal stress and strengths of the fault from the geophysical survey (resistivity and gravity) and in-situ borehole experiments. Our findings are as follows: (1) The fracture zone around the Atera fault shows a very wide and complex fracture structure, from approximately 1 km to 4 km wide. (2) The average slip rate was estimated to be 5.3 m /1000 yr by the distribution of basalt in the age of 1.5 Ma as determined by radioactive dating. We inferred that the Atera fault has been repeatedly active in recent geologic time; however, it is in a very weak state at present. (3) Stress magnitude decreases in the area closer to the center of the fracture zone. These are important results to evaluate fault activity. Recent in-situ downhole measurements and coring through active faults have provided us with new insights into the physical properties of fault zones. In the vicinity of the epicenter of the 1995 Hyogo-ken Nanbu (Kobe) earthquake, we have conducted an integrated study by using 1,000 m to 1,800 m deep drilling wells. In particular, the Nojima-Hirabayashi borehole was drilled to a depth of 1,838 m and directly intersected the Nojima fault. Three possible fault strands were detected at depths of 1,140 m, 1,313 m and 1,800 m. Major results obtained from this study include the following: (1) Shear stress around the fault zone is very small, and the orientation of the maximum horizontal compression is perpendicular to the surface trace of faults. (2) From the results of a heat flow study, the lower cut-off depth of the aftershocks was estimated to be roughly 300 _E#8249;C. (3) Cores were classified into several types of fault rocks, and an asymmetric distribution pattern of these fault rocks in the fracture zones was identified. (4) Country rock is characterized by very low permeability and high strength. (5) Resistivity structure can be explained by a model of a fault extending to greater depths but with low resistivity. The integrated study by geophysical survey, drilling and core analyses, downhole measurements and long-term monitoring directly within these fault zones, provide us with characteristic features and dynamics of active faults.

  1. Commercial geophysical well logs from the USW G-1 drill hole, Nevada Test Site, Nevada

    USGS Publications Warehouse

    Muller, D.C.; Kibler, J.E.

    1983-01-01

    Drill hole USW G-1 was drilled at Yucca Mountain, Nevada Test Site, Nevada, as part of the ongoing exploration program for the Nevada Nuclear Waste Storage Investigations. Contract geophysical well logs run at USW G-1 show only limited stratigraphic correlations, but correlate reasonably well with the welding of the ash-flow and ash-fall tuffs. Rocks in the upper part of the section have highly variable physical properties, but are more uniform and predictably lower in the section.

  2. Data from core analyses, aquifer testing, and geophysical logging of Denver Basin bedrock aquifers at Castle Pines, Colorado

    USGS Publications Warehouse

    Robson, S.G.; Banta, E.R.

    1993-01-01

    This report contains data pertaining to the geologic and hydrologic characteristics of the bedrock aquifers of the Denver basin at a site near Castle Pines, Colorado. Data consist of a lithologic- description of about 2,400 ft of drill core and laboratory determinations of mineralogy, grain size, bulk and grain density, porosity, specific yield, and specific retention for selected core samples. Water-level data, atmospheric-pressure measurements, aquifer-compression measurements, and borehole geophysical logs also are included.

  3. Drilling report and core logs for the 1981 drilling of Kilauea Iki lava lake, Kilauea volcano, Hawaii, with comparative notes on earlier (1967-1979) drilling experiences

    SciTech Connect

    Helz, R.T.; Wright, T.L.

    1983-01-01

    The purpose is: (1) to describe the 1981 drilling of Kilauea Iki lava lake, (2) to present the logs for the drill core recovered during the 1981 drilling, and (3) to present a summary of some of the field observations made during the 1967, 1975, 1976 and 1979 drillings that are relevant to the crystallization history of Kilauea Iki lava lake. This report supplements logs for the 1967-1979 core presented in Helz et al. (1980). 21 references, 4 figures, 4 tables.

  4. Heave Compensation Evaluation and Formation Strength Estimation from Drill String Acceleration Measurements While Coring

    Microsoft Academic Search

    G. Guerin; D. Goldberg; A. Meltser

    2001-01-01

    One of the recurring challenges in deep-sea drilling has been to maintain a precise control of coring depths, and to limit the influence of surface heave on drill bit motion. Operating in water depths between 1 and 6 km, the Ocean Drilling Program has relied on a drill string heave compensator to collect more than 200 km of cores, with

  5. Drilling-induced core fractures and in situ stress

    Microsoft Academic Search

    Yongyi Li; Douglas R. Schmitt

    1998-01-01

    The relationship between the shapes of drilling-induced core fractures and the in situ state of stress is developed. The stress concentrations at the well bore bottom are first determined using a complete three-dimensional finite element analysis. Existing in situ compressional stresses generate large tensions in the immediate vicinity of the bottom hole which are sufficient to rupture the rock. Tensile

  6. Discarded Drill Cores from the Blackbird Cobalt-Copper Mine

    USGS Multimedia Gallery

    Blocks of biotitic meta-sandstone from the lower part of the Gunsight Formation, and drill core from the underlying banded siltite unit of the Apple Creek Formation, lying on the dump of the lower workings of the Copper Queen mine, southeast of the Blackbird cobalt-copper mine area....

  7. Development of a drilling and coring test-bed for lunar subsurface exploration and preliminary experiments

    NASA Astrophysics Data System (ADS)

    Shi, Xiaomeng; Deng, Zongquan; Quan, Qiquan; Tang, Dewei; Hou, Xuyan; Jiang, Shengyuan

    2014-07-01

    Drill sampling has been widely employed as an effective way to acquire deep samples in extraterrestrial exploration. A novel sampling method, namely, flexible-tube coring, was adopted for the Chang'e mission to acquire drilling cores without damaging stratification information. Since the extraterrestrial environment is uncertain and different from the terrestrial environment, automated drill sampling missions are at risk of failure. The principles of drilling and coring for the lunar subsurface should be fully tested and verified on earth before launch. This paper proposes a test-bed for conducting the aforementioned experiments on earth. The test-bed comprises a rotary-percussive drilling mechanism, penetrating mechanism, drilling medium container, and signal acquisition and control system. For granular soil, coring experiments indicate that the sampling method has a high coring rate greater than 80%. For hard rock, drilling experiments indicate that the percussive frequency greatly affects the drilling efficiency. A multi-layered simulant composed of granular soil and hard rock is built to test the adaptability of drilling and coring. To tackle complex drilling media, an intelligent drilling strategy based on online recognition is proposed to improve the adaptability of the sampling drill. The primary features of this research are the proposal of a scheme for drilling and coring a test-bed for validation on earth and the execution of drilling experiments in complex media.

  8. Petrophysical and paleomagnetic data of drill cores from the Bosumtwi impact structure, Ghana

    NASA Astrophysics Data System (ADS)

    Elbra, T.; Kontny, A.; Pesonen, L. J.; Schleifer, N.; Schell, C.

    Physical properties from rocks of the Bosumtwi impact structure, Ghana, Central Africa, are essential to understand the formation of the relatively young (1.07 Ma) and small (10.5 km) impact crater and to improve its geophysical modeling. Results of our petrophysical studies of deep drill cores LB-07A and LB-08A reveal distinct lithological patterns but no depth dependence. The most conspicuous difference between impactites and target lithologies are the lower bulk densities and significantly higher porosities of the suevite and lithic breccia units compared to meta-graywacke and metapelites of target lithologies. Magnetic susceptibility shows mostly paramagnetic values (200-500 × 10-6 SI) throughout the core, with an exception of a few metasediment samples, and correlates positively with natural remanent magnetization (NRM) and Q values. These data indicate that magnetic parameters are related to inhomogeneously distributed ferrimagnetic pyrrhotite. The paleomagnetic data reveals that the characteristic direction of NRM has shallow normal (in a few cases shallow reversed) polarity, which is in agreement with the Lower Jaramillo N-polarity chron direction, and is carried by ferrimagnetic pyrrhotite. However, our study has not revealed the expected high magnetization body required from previous magnetic modeling. Furthermore, the LB-07A and LB08-A drill cores did not show the predicted high content of melt in the rocks, requiring a new interpretation model for magnetic data.

  9. Axel rover NanoDrill and PowderDrill: Acquisition of cores, regolith and powder from steep walls

    NASA Astrophysics Data System (ADS)

    Zacny, K.; Paulsen, G.; Chu, P.; Hedlund, M.; Spring, J.; Osborne, L.; Matthews, J.; Zarzhitsky, D.; Nesnas, I. A.; Szwarc, T.; Indyk, S.

    This paper describes development and testing of low-mass, low-power drills for the Axel rover. Axel is a two-wheeled tethered rover designed for the robotic exploration of steep cliff walls, crater walls and deep holes on earth and other planetary bodies. The Axel rover has a capability to deploy scientific instruments and/or samplers in the areas of interest to scientists currently inaccessible by conventional robotic systems. To enable sample recovery, we developed two drills: NanoDrill for acquisition of 25 mm long and 7 mm diameter cores and PowderDrill for acquisition of either in situ regolith/soil or drilled cuttings from depths of up to 15 mm. Both drills have been successfully tested in laboratory in limestone and sandstone rocks and on-board the Axel rover in the Mars Yard at NASA JPL. The drills managed to acquire limestone and sandstone cores and powder, with an average power of less than 5 Watts. The penetration rate of the NanoDrill was ~2 mm/min and of the PowderDrill it was ~9 mm/min. After sample acquisition, both drills successfully ejected of the acquired samples (cores and powder).

  10. Infrared Spectroscopy for Rapid Characterization of Drill Core and Cutting Mineralogy

    NASA Astrophysics Data System (ADS)

    Calvin, W. M.; Kratt, C.; Kruse, F. A.

    2009-12-01

    Water geochemistry can vary with depth and location within a geothermal reservoir, owing to natural factors such as changing rock type, gas content, fluid source and temperature. The interaction of these variable fluids with the host rock will cause well known changes in alteration mineral assemblages that are commonly factored into the exploration of hydrothermal systems for economic metals, but are less utilized with regard to mapping borehole geology for geothermal energy production. Chemistry of geothermal fluids and rock alteration products can impact production factors such as pipeline corrosion and scaling and early studies explored the use of both silica and chlorites as geothermometers. Infrared spectroscopy is particularly good at identifying a wide variety of alteration minerals, especially in discrimination among clay minerals, with no sample preparation. The technique has been extensively used in the remote identification of materials, but is not commonly used on drill core or chips. We have performed several promising pilot studies that suggest the power of the technique to sample continuously and provide mineral logs akin to geophysical ones. We have surveyed a variety of samples, including drill chip boards, boxed core, and drill cuttings from envelopes, sample bottles and chip trays. This work has demonstrated that core and drill chips can be rapidly surveyed, acquiring spectra every few to tens of cm of section, or the vertical resolution of the chip tray (typically 10 feet). Depending on the sample type we can acquire spectral data over thousands of feet depth at high vertical resolution in a fraction of the time that is needed for traditional analytical methods such as XRD or TEM with better accuracy than traditional geologic drill or chip logging that uses visual inspection alone. We have successfully identified layered silicates such as illite, kaolinite, montmorillonite chlorite and prehnite, zeolites, opal, calcite, jarosite and iron oxides and hydroxides in geothermal drill samples. We are currently developing automated analysis techniques to convert this detailed spectral logging data into high-vertical-resolution mineral depth profiles that can be linked to lithology, stratigraphy, fracture zones and potential for geothermal production. Also in development are metrics that would link mapped mineralogy to known geothermometers such as Na-K, Mg depletion, discrimination among illite, montmorillonite, and beidellite, and kaolinite crystallinity. Identification of amorphous and crystalline silica components (chalcedony, crystobalite and quartz) can also constrain silica geothermometry. The degree of alteration and some mineral types have been shown to be a proxy for host rock permeability, natural circulation, and the potential for reservoir sealing. Analysis of alteration intensity is also under way. We will present a synthesis of results to date.

  11. Miniature CVD-Diamond Coring Drills for Robotic Sample Collection and Analysis

    NASA Astrophysics Data System (ADS)

    Vaniman, D. T.; Trava-Airoldi, V. J.; Bish, D. L.; Chipera, S. J.

    2003-03-01

    Chemical vapor deposition (CVD) can be used to fabricate small diamond core drills that are relatively transparent to X-rays and to infrared radiation, allowing the drill to double as a sample holder.

  12. Hyaloclastites and the slope stability of Hawaiian volcanoes: Insights from the Hawaiian Scientific Drilling Project's 3-km drill core

    Microsoft Academic Search

    Peter Schiffman; Robert J. Watters; Nick Thompson; Anthony W. Walton

    2006-01-01

    Core samples recovered during the Hawaiian Scientific Drilling Project (HSDP) drilling project reveal that the upper 1 km of the submarine flank of Mauna Kea is comprised mainly of hyaloclastites. Progressive, very low-temperature alteration of these hyaloclastites has been accompanied by systematic transformations in physical properties of these deposits. Hyaloclastite deposits which directly underlie ca. 1 km of subaerially-emplaced lavas

  13. Comparison of core control and geophysical investigations, silica sand deposits, Dawmat Al Jandal, Al Jawf at Saudi Arabia

    NASA Astrophysics Data System (ADS)

    Alsulaimani, Ghassan Salem

    This thesis is a summary of a comprehensive geophysical investigation in southern Dawmat Al Jandal, Al Jawf in Saudi Arabia. This research demonstrates that the acquisition of both core control and geophysical data is superior to the acquisition of core control alone. Coring is expensive and is limited in subsurface coverage. Geophysical surveying, however, is a relatively rapid and cost-effective means of deriving information about the subsurface between core holes. Ground penetrating radar (GPR), Multichannel Analysis of Surface Waves (MASW), and Seismic Refraction methods were used as exploration techniques to locate surficial mineral deposits within the study area. During the course of these investigations, the author tries to review the acquired 1620 meters of ground penetrating radar (GPR) data to image internal reflections (if any) within the sand and the top of the underlying sandstone; 27 MASW field records were acquired at each core hole location, which generated 1-D and 2-D shear wave velocity profiles, and 27 seismic refraction profiles were acquired, which did not image the top of the sandstone. The purpose was to estimate the thickness of the sand and to map bedding planes within the sand to better understand depositional environments under the same conditions, based on the high-resolution 2-D surveys, mostly performed in mining areas. The Geophysical investigations were successful and proved to be useful methods for the exploration of shallow subsurface areas where the results are equal to, or slightly different from, the corresponding with of the core holes' values. Therefore, geophysical surveying does not remove the need for core control, but when it is properly applied it can optimize exploration rating programs by maximizing the rate of ground coverage and minimizing the amount of core drilling that is required.

  14. Research core drilling in the Manson impact structure, Iowa

    NASA Technical Reports Server (NTRS)

    Anderson, R. R.; Hartung, J. B.; Roddy, D. J.; Shoemaker, E. M.

    1992-01-01

    The Manson impact structure (MIS) has a diameter of 35 km and is the largest confirmed impact structure in the United States. The MIS has yielded a Ar-40/Ar-39 age of 65.7 Ma on microcline from its central peak, an age that is indistinguishable from the age of the Cretaceous-Tertiary boundary. In the summer of 1991 the Iowa Geological Survey Bureau and U.S. Geological Survey initiated a research core drilling project on the MIS. The first core was beneath 55 m of glacial drift. The core penetrated a 6-m layered sequence of shale and siltstone and 42 m of Cretaceous shale-dominated sedimentary clast breccia. Below this breccia, the core encountered two crystalline rock clast breccia units. The upper unit is 53 m thick, with a glassy matrix displaying various degrees of devitrification. The upper half of this unit is dominated by the glassy matrix, with shock-deformed mineral grains (especially quartz) the most common clast. The glassy-matrix unit grades downward into the basal unit in the core, a crystalline rock breccia with a sandy matrix, the matrix dominated by igneous and metamorphic rock fragments or disaggregated grains from those rocks. The unit is about 45 m thick, and grains display abundant shock deformation features. Preliminary interpretations suggest that the crystalline rock breccias are the transient crater floor, lifted up with the central peak. The sedimentary clast breccia probably represents a postimpact debris flow from the crater rim, and the uppermost layered unit probably represents a large block associated with the flow. The second core (M-2) was drilled near the center of the crater moat in an area where an early crater model suggested the presence of postimpact lake sediments. The core encountered 39 m of sedimentary clast breccia, similar to that in the M-1 core. Beneath the breccia, 120 m of poorly consolidated, mildly deformed, and sheared siltstone, shale, and sandstone was encountered. The basal unit in the core was another sequence of sedimentary clast breccia. The two sedimentary clast units, like the lithologically similar unit in the M-1 core, probably formed as debris flows from the crater rim. The middle, nonbrecciated interval is probably a large, intact block of Upper Cretaceous strata transported from the crater rim with the debris flow. Alternatively, the sequence may represent the elusive postimpact lake sequence.

  15. Comparison and analysis of subglacial bedrock core drilling technology in Polar Regions

    NASA Astrophysics Data System (ADS)

    Wang, Jinsong; Cao, PinLu; Liu, ChunPeng; Talalay, P. G.

    2015-06-01

    The Gamburtsev Mountains, located in East Antarctica, is the direct geomorphological cause of the formation of Dome A. Drilling the core of the Gamburtsev subglacial mountains is one of the primary goals of modern polar research, which is important to understand its formation and evolution process, the ice sheet formation of Dome A, glacial motion, climate change, and so on. This paper describes the status and progress of subglacial bedrock drilling technology. Existing subglacial bedrock drilling technologies are also discussed, including common rig rotary drilling, wire-line core drilling, coiled tubing drilling, and electromechanical drilling. Results of this paper will provide valuable information for Chinese subglacial bedrock core drilling project in the Gamburtsev mountains.

  16. Comment on “Antarctic drill extracts new core for climate studies”

    NASA Astrophysics Data System (ADS)

    Waddington, E. D.; Grootes, P. M.; Denton, G. H.; Drewry, D. J.

    The March 15 issue of Eos reported completion of a new ice core drilled to bedrock in Antarctica (Antarctic drill extracts new core for climate studies, Eos, 75(11), 129). A paleoclimate record over a large part of the last ice age—possibly 60,000 years or longer—is expected from the site, identified in the article as McMurdo Dome.We wish to clarify two points. First, the 200,000 year paleoclimate record reported in the March 15 story is incorrect. Second, we wish to forestall future confusion in the literature in regard to the name McMurdo Dome used in the Eos article. On the basis of an airborne radio-echo sounding survey, Drewry [1980] first recognized the existence of an ice dome of approximately 30×80 km on the East Antarctic Plateau west of the Dry Valleys. Because the dome is the source of Taylor Glacier in Taylor Valley, he called the feature Taylor Dome. However, in the absence of an official name, the variant, McMurdo Dome, was also used in the literature [Denton et al., 1989], and for operations and field planning within the U.S. Antarctic Program.

  17. Core-log integration studies in hole-A of Taiwan Chelungpu-fault Drilling Project

    NASA Astrophysics Data System (ADS)

    Wu, Yun-Hao; Yeh, En-Chao; Dong, Jia-Jyun; Kuo, Li-Wei; Hsu, Jui-Yu; Hung, Jih-Hao

    2008-09-01

    Taiwan Chelungpu-fault Drilling Project (TCDP) was initiated to understand the physical mechanisms involved in the large displacements of the 1999 Taiwan Chi-Chi earthquake. Continuous measurements of cores (including laboratory work) and a suite of geophysical downhole logs, including P- and S-wave sonic velocity, gamma ray, electrical resistivity, density, temperature, electrical borehole images and dipole-shear sonic imager, were acquired in Hole-A over the depth of 500-2003 m. Integrated studies of cores and logs facilitate qualitative and quantitative comparison of subsurface structures and physical properties of rocks. A total of 10 subunits were divided on the basis of geophysical characteristics. Generally, formation velocity and temperature increase with depth as a result of the overburden and thermal gradient, respectively. Gamma ray, resistivity, formation density, shear velocity anisotropy and density-derived porosity are primarily dependent on the lithology. Zones with changes of percentage of shear wave anisotropy and the fast shear polarization azimuth deduced from Dipole Shear-Imager (DSI) are associated with the appearance of fractures, steep bedding and shear zones. The fast shear wave azimuth is in good agreement with overall dip of the bedding (approximately 30° towards SE) and maximum horizontal compressional direction, particularly in the Kueichulin Formation showing strong shear wave velocity anisotropy. Bedding-parallel fractures are prevalent within cores, whereas minor sets of high-angle, NNW-SSE trending with N- and S-dipping fractures are sporadically distributed. The fault zone at depth 1111 m (FZA1111) is the Chi-Chi earthquake slip zone and could be a fluid conduit after the earthquake. The drastic change in fast shear wave polarization direction across the underlying, non-active Sanyi thrust at depth 1710 m reflects changes in stratigraphy, physical properties and structural geometry.

  18. Drilling and geophysical logs of the tophole at an oil-and-gas well site, Central Venango County, Pennsylvania

    USGS Publications Warehouse

    Williams, John H.; Bird, Philip H.; Conger, Randall W.; Anderson, J. Alton

    2014-01-01

    Collection and integrated analysis of drilling and geophysical logs provided an efficient and effective means for characterizing the geohydrologic framework and conditions penetrated by the tophole at the selected oil-and-gas well site. The logging methods and lessons learned at this well site could be applied at other oil-and-gas drilling sites to better characterize the shallow subsurface with the overall goal of protecting freshwater aquifers during hydrocarbon development.

  19. OCEAN DRILLING PROGRAM LEG 100 SCIENTIFIC PROSPECTUS

    E-print Network

    , navigation, drill pipe severing, logging winch, laboratory, and geophysical systems are operational; 4) to acquire instrumentation data on ship systems; 5) to acquire cores from areas of scientific interest; and

  20. Use of Tracers To Investigate Drilling-Fluid Invasion and Oil Flushing During Coring

    Microsoft Academic Search

    A. Brown; F. T. Marriott

    1988-01-01

    This work develops a method in which chemical tracers in the drilling fluid help determine mud filtrate invasion and the degree of oil flushing during coring of steamed and unsteamed heavy-oil formations. Salts of iodide and bromide were added to the drilling fluid while Well TO3 was cored through the Lombardi and Aurignac zones at San Ardo field in California.

  1. Agglutinates as recorders of regolith evolution - Application to the Apollo 17 drill core

    SciTech Connect

    Laul, J.C.; Smith, M.R.

    1984-11-15

    Chemical data are reported for agglutinates from 26 depth intervals of the Apollo 17 deep drill core, and the compositions of the agglutinates are compared with those of the soils in which they occur. The agglutinate sequence suggests a scenario in which several closely-spaced depositional events were involved in the formation of the drill core, rather than a continuous accumulation process.

  2. Joint laboratory investigations of the physical and mechanical properties of the COSC-1 drill core, Sweden

    NASA Astrophysics Data System (ADS)

    Almqvist, Bjarne S. G.; Schmitt, Douglas R.; Lebedev, Maxim; Ask, Maria; Wenning, Quinn; Zappone, Alba; Berthet, Théo; Malehmir, Alireza

    2015-04-01

    The Caledonian orogen is an early to middle Paleozoic mountain chain with size dimension similar to the Alpine-Himalayan orogen. Parts of the Caledonian orogen have been deeply eroded and provide excellent exposure of rocks that were emplaced into the middle and lower crust during orogenesis. These exposed rock units therefore provide the possibility to study processes of mountain building that are often inaccessible in more modern orogens, and represent the targets for the Collisional Orogeny in the Scandinavian Caledonides deep drilling project (COSC-1). The main target of COSC-1 was the high grade Seve nappe complex. Temperature estimates indicate granulite facies conditions at the top of this nappe, grading to lower amphibolitic conditions downwards through the nappe. Discovery of micro-diamond included in garnets from the nearby Åreskutan mountain hints at an ultra-high pressure origin in parts of the Seve nappe complex. The COSC-1 deep drilling project presents a unique opportunity to study the laboratory physical properties of a 2.5 km drill core, which can be correlated to downhole logging measurements and for the interpretation of surface geophysical experiments. In a joint effort that comprises five laboratories, the physical properties the COSC drill core are investigated. Measurement schemes and preliminary results from this cooperative effort are presented. The physical properties suite of measurements on the core includes (i) density, (ii) porosity, (iii) ultrasonic wave velocity and anisotropy at elevated confining pressure, (iv) seismic attenuation and (v) permeability (and anisotropy of permeability). Mechanical properties include uniaxial and triaxial compressive strength at different confining pressures, and subsequent calculation of internal and residual friction angles. The joint investigations will also serve to cross-validate and calibrate different laboratory techniques that are used to measure physical properties. The rock units investigated includes layers of gneiss, amphibolite, calc-silicates, migmatite and sparse meta-gabbro and marble. More mafic units (amphibolite and meta-gabbro) can be separated from the gneisses and migmatite based on density and sonic velocities, measured with active gamma log and full wave form sonic log. Deformation is prevalent in rocks throughout the 2500 m deep borehole, but a more than 300 m thick package of strongly sheared mylonites stands out at the bottom of the borehole. Laboratory measurements of density and ultrasonic velocities are critical on core material that comes from depths greater than 1600 m, because borehole density and sonic logs are lacking at these depths. In addition, the ultrasonic laboratory measurements serve as the only method to directly evaluate seismic anisotropy in the solid rock mass. Additional results and analysis are expected to yield data that will be useful for integration with surface and downhole geophysical data (e.g. vertical seismic profiling data), constraining the state of in-situ stress, and provide insights into the emplacement processes of the Seve nappe complex, and its relationship to the underlying lower-grade Särv and Jämtlandian nappes.

  3. The Chicxulub Multiring Impact Crater and the Cretaceous/Paleogene Boundary: Results From Geophysical Surveys and Drilling

    NASA Astrophysics Data System (ADS)

    Urrutia-Fucugauchi, J.; Perez-Cruz, Ligia

    2010-03-01

    The Chicxulub crater has attracted considerable attention as one of the three largest terrestrial impact structures and its association with the Cretaceous/Paleogene boundary (K/Pg). Chicxulub is a 200 km-diameter multi-ring structure formed 65.5 Ma ago in the Yucatan carbonate platform in the southern Gulf of Mexico and which has since been buried by Paleogene and Neogene carbonates. Chicxulub is one of few large craters with preserved ejecta deposits, which include the world-wide K/Pg boundary clay layer. The impact has been related to the global major environmental and climatic effects and the organism mass extinction that mark the K/Pg boundary, which affected more than 70 % of organisms, including the dinosaurs, marine and flying reptiles, ammonites and a large part of the marine microorganisms. The impact and crater formation occur instantaneously, with excavation of the crust down to 25 km depths in fractions of second and lower crust uplift and crater formation in a few hundreds of seconds. Energy released by impact and crustal deformation generates seismic waves traveling the whole Earth, and resulting in intense fracturing and deformation at the target site. Understanding of the physics of impacts on planetary surfaces and modeling of processes of crustal deformation, rheological behavior of materials at high temperatures and pressures remain a major challenge in geosciences. Study of the Chicxulub crater and the global effects and mass extinction requires inter- and multidisciplinary approaches, with researchers from many diverse fields beyond the geosciences. With no surface exposures, geophysical surveys and drilling are required to study the crater. Differential compaction between the impact breccias and the surrounding carbonate rocks has produced a ring-fracture structure that at the surface reflects in a small topographic depression and the karstic cenote ring. The crater structure, located half offshore and half on-land, has been imaged by different geophysical aerial, land and marine methods including gravity, magnetics, electromagnetics and seismic refraction and reflection. The impact lithologies and carbonate sequence have been cored as part of several drilling projects. Here we analyze the stratigraphy of Chicxulub from borehole logging data and core analyses, with particular reference to studies on CSDP Yaxcopoil-1 and UNAM Santa Elena boreholes. Analyses of core samples have examined the stratigraphy of the cover carbonate sequence, impact breccia contact and implications for impact age, K/Pg global correlations and paleoenvironmental conditions following impact. The K/Pg age for Chicxulub has been supported from different studies, including Ar/Ar dating, magnetic polarity stratigraphy, geochemistry and biostratigraphy. A Late Maastrichtian age has also been proposed for Chicxulub from studies in Yaxcopoil-1 basal Paleocene carbonates, with impact occurring 300 ka earlier predating the K/Pg boundary. This proposal calls attention to the temporal resolution of stratigraphic and chronological methods, and the need for further detailed analyses of the basal carbonate sections in existing boreholes and new drilling/coring projects. Stratigraphy of impact ejecta and basal sediments in Yaxcopoil-1 and UNAM boreholes indicates a hiatus in the basal sequence. Modeling of post- impact processes suggest erosion effects due to seawater back surge, block slumping and partial rim collapse of post-impact crater modification. Analyses of stable isotopes and magnetostratigraphic data for the Paleocene carbonate sequences in Yaxcopoil-1 and Santa Elena boreholes permit to investigate the post- impact processes, depositional conditions and age of basal sediments. Correlation of stable isotopes with the global pattern for marine carbonate sediments provides a stratigraphic framework for the basal Paleocene carbonates. The analyses confirm a K/Pg boundary age for the Chicxulub impact. References: Collins et al, 2008. Earth Planetary Science Letters 270, 221-230; Gulick et al, 2008. Nature Geoscience 1, 131-135; Hild

  4. Tecuamburro Volcano, Guatemala geothermal gradient core hole drilling, operations, and preliminary results

    Microsoft Academic Search

    S. Goff; G. Heiken; F. Goff; J. Gardner; W. Duffield; L. Martinelli; S. Aycinena; O. Castaneda

    1990-01-01

    A geothermal gradient core hole (TCB-1) was drilled to a depth of 700+ m at the Tecuamburro geothermal site, Guatemala during February and March, 1990. The core hole is located low on the northern flank of the Tecuamburro Volcano complex. Preliminary analysis of cores (>98% core recovery) indicates that the hydrothermal system may be centered in the 4-km-diameter Chupadero Crater,

  5. GRED STUDIES AND DRILLING OF AMERICULTURE STATE 2, AMERICULTURE TILAPIA FARM LIGHTNING DOCK KGRA, ANIMAS VALLEY, NM

    SciTech Connect

    Witcher, James

    2006-08-01

    This report summarizes the GRED drilling operations in the AmeriCulture State 2 well with an overview of the preliminary geologic and geothermal findings, from drill cuttings, core, geophysical logs and water geochemical sampling.

  6. Petrophysical analysis of geophysical logs of the National Drilling Company-U.S. Geological Survey ground-water research project for Abu Dhabi Emirate, United Arab Emirates

    USGS Publications Warehouse

    Jorgensen, Donald G.; Petricola, Mario

    1994-01-01

    A program of borehole-geophysical logging was implemented to supply geologic and geohydrologic information for a regional ground-water investigation of Abu Dhabi Emirate. Analysis of geophysical logs was essential to provide information on geohydrologic properties because drill cuttings were not always adequate to define lithologic boundaries. The standard suite of logs obtained at most project test holes consisted of caliper, spontaneous potential, gamma ray, dual induction, microresistivity, compensated neutron, compensated density, and compensated sonic. Ophiolitic detritus from the nearby Oman Mountains has unusual petrophysical properties that complicated the interpretation of geophysical logs. The density of coarse ophiolitic detritus is typically greater than 3.0 grams per cubic centimeter, porosity values are large, often exceeding 45 percent, and the clay fraction included unusual clays, such as lizardite. Neither the spontaneous-potential log nor the natural gamma-ray log were useable clay indicators. Because intrinsic permeability is a function of clay content, additional research in determining clay content was critical. A research program of geophysical logging was conducted to determine the petrophysical properties of the shallow subsurface formations. The logging included spectral-gamma and thermal-decay-time logs. These logs, along with the standard geophysical logs, were correlated to mineralogy and whole-rock chemistry as determined from sidewall cores. Thus, interpretation of lithology and fluids was accomplished. Permeability and specific yield were calculated from geophysical-log data and correlated to results from an aquifer test. On the basis of results from the research logging, a method of lithologic and water-resistivity interpretation was developed for the test holes at which the standard suite of logs were obtained. In addition, a computer program was developed to assist in the analysis of log data. Geohydrologic properties were estimated, including volume of clay matrix, volume of matrix other than clay, density of matrix other than clay, density of matrix, intrinsic permeability, specific yield, and specific storage. Geophysical logs were used to (1) determine lithology, (2) correlate lithologic and permeable zones, (3) calibrate seismic reprocessing, (4) calibrate transient-electromagnetic surveys, and (5) calibrate uphole-survey interpretations. Logs were used at the drill site to (1) determine permeability zones, (2) determine dissolved-solids content, which is a function of water resistivity, and (3) design wells accordingly. Data and properties derived from logs were used to determine transmissivity and specific yield of aquifer materials.

  7. REVIEW ARTICLE: Geophysical signatures of oceanic core complexes

    NASA Astrophysics Data System (ADS)

    Blackman, Donna K.; Canales, J. Pablo; Harding, Alistair

    2009-08-01

    Oceanic core complexes (OCCs) provide access to intrusive and ultramafic sections of young lithosphere and their structure and evolution contain clues about how the balance between magmatism and faulting controls the style of rifting that may dominate in a portion of a spreading centre for Myr timescales. Initial models of the development of OCCs depended strongly on insights available from continental core complexes and from seafloor mapping. While these frameworks have been useful in guiding a broader scope of studies and determining the extent of OCC formation along slow spreading ridges, as we summarize herein, results from the past decade highlight the need to reassess the hypothesis that reduced magma supply is a driver of long-lived detachment faulting. The aim of this paper is to review the available geophysical constraints on OCC structure and to look at what aspects of current models are constrained or required by the data. We consider sonar data (morphology and backscatter), gravity, magnetics, borehole geophysics and seismic reflection. Additional emphasis is placed on seismic velocity results (refraction) since this is where deviations from normal crustal accretion should be most readily quantified. However, as with gravity and magnetic studies at OCCs, ambiguities are inherent in seismic interpretation, including within some processing/analysis steps. We briefly discuss some of these issues for each data type. Progress in understanding the shallow structure of OCCs (within ~1 km of the seafloor) is considerable. Firm constraints on deeper structure, particularly characterization of the transition from dominantly mafic rock (and/or altered ultramafic rock) to dominantly fresh mantle peridotite, are not currently in hand. There is limited information on the structure and composition of the conjugate lithosphere accreted to the opposite plate while an OCC forms, commonly on the inside corner of a ridge-offset intersection. These gaps preclude full testing of current models. However, with the data in hand there are systematic patterns in OCC structure, such as the 1-2 Myr duration of this rifting style within a given ridge segment, the height of the domal cores with respect to surrounding seafloor, the correspondence of gravity highs with OCCs, and the persistence of corrugations that mark relative (palaeo) slip along the exposed detachment capping the domal cores. This compilation of geophysical results at OCCs should be useful to investigators new to the topic but we also target advanced researchers in our presentation and synthesis of findings to date.

  8. Density of basalt core from Hilo drill hole, Hawaii

    USGS Publications Warehouse

    Moore, J.G.

    2001-01-01

    Density measurements of 1600 samples of core from 889 to 3097 m depth below sea level in the Hawaii Scientific Drilling Program hole near Hilo, Hawaii show marked differences between the basaltic rock types and help define stratigraphy in the hole. Water-saturated densities of subaerial lava flows (occurring above 1079 m depth) have the broadest range because of the large density variation within a single lava flow. Water-saturated densities commonly range from 2.0 to 3.0 with an average of 2.55 ?? 0.24 g/cc. Dikes and sills range from 2.8 to 3.1 g/cc). Densities of hyaloclastite commonly range from 2.3 to 2.7, with an overall average of about 2.5 g/cc. The low-density of most hyaloclastite is due primarily to palagonitization of abundant glass and presence of secondary minerals in the interstices between fragments. Four principal zones of pillow lava, separated by hyaloclastite, occur in the drill core. The shallowest (1983-2136 m) is paradoxically the densest, averaging 3.01 ?? 0.10 g/cc. The second (2234-2470 m) is decidedly the lightest, averaging 2.67 ?? 0.13 g/cc. The third (2640-2790 m) and fourth (2918-bottom at 3097 m) are high, averaging 2.89 ?? 0.17 and 2.97 ?? 0.08 g/cc, respectively. The first pillow zone includes degassed pillows i.e. lava erupted on land that flowed into the sea. These pillows are poor in vesicles, because the subaerial, one-atmosphere vesicles were compressed when the flow descended to deeper water and higher pressure. The second (low-density, non-degassed) pillow zone is the most vesicle-rich, apparently because it was erupted subaqueously at a shallow depth. The higher densities of the third and fourth zones result from a low vesicularity of only a few percent and an olivine content averaging more than 5% for the third zone and about 10% for the fourth zone. The uppermost hyaloclastite extending about 400 m below the bottom of the subaerial basalt is poorly cemented and absorbs up to 6 wt% of water when immersed. Progressing downward the hyaloclastite absorbs less water and becomes better cemented. This change is apparently due to palagonitization of glass and addition of secondary minerals in the deeper older hyaloclastite, a process favored by the increase of temperature with depth. The cementation is largely complete at 1800 m depth where the temperature attains about 20??C. The zone of freshest, uncemented hyaloclastite represents the weakest rock in the drill hole and is a likely level for tectonic or landslide disruption. ?? 2001 Published by Elsevier Science B.V.

  9. Surface elevation change artifact at the NEEM ice core drilling site, North Greenland.

    NASA Astrophysics Data System (ADS)

    Berg Larsen, Lars; Schøtt Hvidberg, Christine; Dahl-Jensen, Dorthe; Lilja Buchardt, Susanne

    2014-05-01

    The NEEM deep drilling site (77.45°N 51.06°W) is located at the main ice divide in North Greenland. For the ice core drilling project, a number of buildings was erected and left on the snow surface during the five-year project period. The structures created snowdrifts that formed accordingly to the predominant wind direction on the lee side on the buildings and the overwintering cargo. To get access to the buildings, the snowdrifts and the accumulated snow were removed and the surface in the camp was leveled with heavy machinery each summer. In the camp a GPS reference pole was placed as a part of the NEEM strain net, 12 poles placed in three diamonds at distances of 2,5 km, 7,5 km and 25 km they were all measured with high precision GPS every year. Around the reference pole, a 1 km x 1 km grid with a spacing of 100 m was measured with differential GPS each year. In this work, we present results from the GPS surface topography measurements in and around the campsite. The mapping of the topography in and around the campsite shows how the snowdrifts evolve and are the reason for the lift of the camp site area. The accumulated snowdrifts are compared to the dominant wind directions from year to year. The annual snow accumulation at the NEEM site is 0.60 m. The reference pole in the camp indicates an additional snow accumulation of 0.50 m per year caused by collected drifting snow. The surface topography mapping shows that this artificially elevated surface extends up to several kilometers out in the terrain. This could have possible implications on other glaciological and geophysical measurements in the area i.e. pit and snow accumulation studies.

  10. Improved diamond coring bits developed for dry and chip-flush drilling

    NASA Technical Reports Server (NTRS)

    Decker, W. E.; Hampe, W. R.; Hampton, W. H.; Simon, A. B.

    1971-01-01

    Two rotary diamond bit designs, one operating with a chip-flushing fluid, the second including auger section to remove drilled chips, enhance usefulness of tool for exploratory and industrial core-drilling of hard, abrasive mineral deposits and structural masonry.

  11. Possible reasons of shock melt deficiency in the Bosumtwi drill cores

    Microsoft Academic Search

    N. Artemieva

    2007-01-01

    Pre-drilling numerical modeling of the Bosumtwi impact event predicted a 200 m thick coherent melt layer, as well as abundant highly shocked target material within the central part of the crater structure. However, these predictions are in disagreement with data from drill core obtained in 2004-2005. Here I provide a brief overview of previous results and discuss possible reasons behind

  12. Core drill's bit is replaceable without withdrawal of drill stem - A concept

    NASA Technical Reports Server (NTRS)

    Rushing, F. C.; Simon, A. B.

    1970-01-01

    Drill bit is divided into several sectors. When collapsed, the outside diameter is forced down the drill stem, when it reaches bottom the sectors are forced outward and form a cutting bit. A dulled bit is retracted by reversal of this procedure.

  13. Chattanooga shale (Devonian and Mississippian) from the Tennessee Division of Geology: U. S. Department of Energy cored drill holes Number 4 and 5, Hawkins County, Tennessee

    SciTech Connect

    Roen, J.B.; Wallace, L.G.; Milici, R.C.

    1980-01-01

    The Tennessee Division of Geology under contract to the Morgantown Energy Technology Center of the US Department of Energy has drilled eight NX coreholes in eastern Tennessee. The coring program was designed to retrieve continuous cores for a detailed study of the character of the Chattanooga Shale. The geophysical wire-line logging of the NX drill holes was performed by the US Geological Survey. The lithologic and wire-line log data in conjunction with two seismic surveys will be used to evaluate the hydrocarbon potential of the Chattanooga Shale in northeastern Tennessee. The purpose of this report is to present a detailed lithologic description and gamma-ray log of the Tennessee Division of Geology and US Department of Energy cored drill holes no. 4 and 5 (TDG-DOE no. 4 and no. 5). In spite of the overlap, no distinct marker beds were found to facilitate a positive correlation between the two cores. Reconstruction of the total Chattanooga section was based on detailed field mapping of the uppermost dark-gray shale below the base of the Grainger Formation and the projection of the beds. The total thickness of the Chattanooga Shale at the coring locations is estimated to be 1650 to 1700 ft.

  14. Layering in the Paleocene/Eocene boundary of the Millville core is drilling disturbance

    E-print Network

    Zeebe, Richard E.

    on the interpretation of rhythmic layering in the sediment core as annual couplets but here it is proposed that they are an artifact of drilling disturbance. When claystones are rotary cored they can fracture into "biscuits, multiple diffi- culties relating to swelling clays and high pressure in the hole were documented, including

  15. Drilling

    Microsoft Academic Search

    Kurt Walther; Mihael Brajdic; Welf Wawers

    \\u000a The non-contact and therefore wear-free drilling with laser radiation allows a high flexibility and the possibility for automatization.\\u000a A great variety of technical relevant materials like metals, alloys, high-strength materials, ceramics, multi layer systems,\\u000a semiconductors, carbon compounds, composites, diamond, or plastics can be drilled by laser radiation. Further advantages are\\u000a the reproducibility, the drilling velocity, and the achievable aspect ratio.

  16. U. S. Geological Survey core drilling on the Atlantic shelf

    Microsoft Academic Search

    J. C. Hathaway; C. W. Poag; P. C. Valentine; R. E. Miller; D. M. Schultz; F. T. Manheim; F. A. Kohout; M. H. Bothner; D. A. Sangrey

    1979-01-01

    The first broad program of scientific shallow drilling on the US Atlantic continental shelf has delineated rocks of Pleistocene to Late Cretaceous age, including phosphoritic Miocene strata, widespread Eocene carbonate deposits that serve as reflective seismic markers, and several regional unconformities. Two sites, off Maryland and New Jersey, showed light hydrocarbon gases having affinity to mature petroleum. Pore fluid studies

  17. Surface and core wetting effects of surfactants in oil-based drilling fluids

    Microsoft Academic Search

    L. Skalli; J. S. Buckley; Y. Zhang; N. R. Morrow

    2006-01-01

    Surfactants are used in oil-based drilling fluids to emulsify water and to ensure that cuttings are wetted by oil. The products used are based on drilling conditions and are essentially the same for traditional oil-based and synthetic oil-based fluids. Although much of these surface active materials adsorb on cuttings and filter cake, it is still likely that core samples are

  18. Volatiles in glasses from the HSDP2 drill core

    Microsoft Academic Search

    Caroline Seaman; Sarah Bean Sherman; Michael O. Garcia; Michael B. Baker; Brian Balta; Edward Stolper

    2004-01-01

    H2O, CO2, S, Cl, and F concentrations are reported for 556 glasses from the submarine section of the 1999 phase of HSDP drilling in Hilo, Hawaii, providing a high-resolution record of magmatic volatiles over ?200 kyr of a Hawaiian volcano's lifetime. Glasses range from undegassed to having lost significant volatiles at near-atmospheric pressure. Nearly all hyaloclastite glasses are degassed, compatible

  19. Development of a drill core database utilizing image analysis and geographic information systems

    SciTech Connect

    White, W.S.; Nash, G.D.; Nielson, D.L. [Univ. of Utah, Salt Lake City, UT (United States)

    1996-07-01

    Rock core is often obtained during a drilling project to help determine the lithology of the strata that is being drilled. However, after the project is over and lithologic logs have been produced from the core, the task of archiving the often large and unwieldy rock core begins. This study investigates digital analysis and archiving of rock core using conventional image processing and geographic information systems (GIS) software. As a case study, digital core images of the Ferron Sandstone Member of the Mancos Shale from central Utah were used. After digital photography of the core, a clustering algorithm in a commercial image analysis software package was used to identify lithologies. High resolution VisNear/SWIR spectroscopy and x-ray diffractometry were employed to further quantify the core lithologies and provide additional inputs for the GIS core database. The core archive includes images of the Ferron core, lithologic logs, photomicrographs, and spectral and x-ray information, in a customized GIS environment that is both easy to use, less costly, and more informative than conventional core archiving methods.

  20. Permeability and of the San Andreas Fault core and damage zone from SAFOD drill core

    NASA Astrophysics Data System (ADS)

    Rathbun, A. P.; Fry, M.; Kitajima, H.; Song, I.; Carpenter, B. M.; Marone, C.; Saffer, D. M.

    2012-12-01

    Quantifying fault-rock permeability is important toward understanding both the regional hydrologic behavior of fault zones, and poro-elastic processes that may affect faulting and earthquake mechanics by mediating effective stress. These include persistent fluid overpressures hypothesized to reduce fault strength, as well as dynamic processes that may occur during earthquake slip, including thermal pressurization and dilatancy hardening. To date, studies of permeability on fault rocks and gouge from plate-boundary strike-slip faults have mainly focused on samples from surface outcrops. We report on permeability tests conducted on the host rock, damage zone, and a major actively creeping fault strand (Central Deformation Zone, CDZ) of the San Andreas Fault (SAF), obtained from coring across the active SAF at ~2.7 km depth as part of SAFOD Phase III. We quantify permeability on subsamples oriented both perpendicular and parallel to the coring axis, which is nearly perpendicular to the SAF plane, to evaluate permeability anisotropy. The fault strand samples were obtained from the CDZ, which accommodates significant creep, and hosts ~90% of the observed casing deformation measured between drilling phases. The CDZ is 2.6 m thick with a matrix grain size < 10 ?m and ~5% vol. clasts, and contains ~80% clay, of which ~90% is smectite. We also tested damage zone samples taken from adjacent core sections within a few m on either side of the CDZ. Permeability experiments were conducted in a triaxial vessel, on samples 25.4 mm in diameter and ~20-35 mm in length. We conducted measurements under isotropic stress conditions, at effective stress (Pc') of ~5-70 MPa. We measure permeability using a constant head flow-through technique. At the highest Pc', low permeability of the CDZ and damage zone necessitates using a step loading transient method and is in good agreement with permeabilities obtained from flow-through experiments. We quantify compression behavior by monitoring the volumetric and axial strain in response to changes in effective stress. Permeability of the CDZ is systematically lower than that of the damage zone or wall rock, and decreases from 2x10 -19m 2 at 5 MPa effective stress to 5x10-21 m 2 at 65 MPa. Some damage zone samples exhibit permeabilities as low as the CDZ, but most values are ~10-30 times higher. For both the damage zone and CDZ, permeability anisotropy is negligible. Volumetric compressibility (mv) decreases from ~1x10-9 Pa-1 to ~1x10-10 Pa-1 and hydraulic diffusivity decreases from ~2x10-7 m2/s to 1.7x10-8 m2/s over a range of effective stresses from 10 to 65 MPa. Our results are consistent with published geochemical data from SAFOD mud gas monitoring, and from inferred pore pressures during drilling [Zoback et al., 2010], which together suggest that the fault has a low permeability and is a barrier to regional fluid flow along. Our results also demonstrate that the diffusivity of the fault core of CDZ is sufficiently low to result in effectively undrained behavior over timescales of minutes to hours, thus facilitating dynamic hydrologic processes that may impact fault slip, including thermal pressurization and dilatancy hardening.

  1. The Glomar Explorer as a Deep Ocean Drilling and Coring Ship

    Microsoft Academic Search

    S. Wetmore; J. McNary

    1979-01-01

    In early 1977 Global Marine Development Inc. (GMDI) conducted a study for the Scripps Institution of Oceanography (SIO) and the National Science Foundation (NSF) to determine the feasibility of utilizing the GLOMAR EXPLORER for deep water scientific drilling and coring. The large physical size, the massive load handling capability and the large center well of the GLOMAR EXPLORER allow a

  2. Late Quaternary palaeoenvironment of northern Guatemala: evidence from deep drill cores and seismic stratigraphy of Lake

    E-print Network

    Gilli, Adrian

    Late Quaternary palaeoenvironment of northern Guatemala: evidence from deep drill cores and seismic Lake Pete´n Itza´, northern Guatemala, in water depths ranging from 30 to 150 m, as part interstadials. Keywords Guatemala, lake level changes, lake sediments, palaeoclimatology, Pete´n Itza´, seismic

  3. Application of scientific core drilling to geothermal exploration: Platanares, Honduras and Tecuamburro Volcano, Guatemala, Central America

    Microsoft Academic Search

    S. J. Goff; F. E. Goff; G. H. Heiken; W. A. Duffield; C. J. Janik

    1994-01-01

    Our efforts in Honduras and Guatemala were part of the Central America Energy Resource Project (CAERP) funded by the United States Agency for International Development (AID). Exploration core drilling operations at the Platanares, Honduras and Tecuamburro Volcano, Guatemala sites were part of a geothermal assessment for the national utility companies of these countries to locate and evaluate their geothermal resources

  4. Mapping alteration minerals at prospect, outcrop and drill core scales using imaging spectrometry

    Microsoft Academic Search

    Fred A. Kruse; Richard L. Bedell; James V. Taranik; William A. Peppin; Oliver Weatherbee; Wendy M. Calvin

    2012-01-01

    Imaging spectrometer data (also known as ‘hyperspectral imagery’ or HSI) are well established for detailed mineral mapping from airborne and satellite systems. Overhead data, however, have substantial additional potential when used together with ground-based measurements. An imaging spectrometer system was used to acquire airborne measurements and to image in-place outcrops (mine walls) and boxed drill core and rock chips using

  5. Mapping alteration minerals at prospect, outcrop and drill core scales using imaging spectrometry

    Microsoft Academic Search

    Fred A. Kruse; Richard L. Bedell; James V. Taranik; William A. Peppin; Oliver Weatherbee; Wendy M. Calvin

    2011-01-01

    Imaging spectrometer data (also known as ‘hyperspectral imagery’ or HSI) are well established for detailed mineral mapping from airborne and satellite systems. Overhead data, however, have substantial additional potential when used together with ground-based measurements. An imaging spectrometer system was used to acquire airborne measurements and to image in-place outcrops (mine walls) and boxed drill core and rock chips using

  6. Discoveries Within the Ice: Plans of the Ice Coring and Drilling Science Community

    Microsoft Academic Search

    M. R. Albert; C. R. Bentley; M. Twickler

    2010-01-01

    The search for answers to questions about our changing climate creates an urgent need to discover the clues to the past archived in glaciers and ice sheets, and to understand current ice sheet behavior. Recognizing that U.S. scientific productivity in this area depends upon a mechanism for ensuring continuity and international cooperation in ice coring and drilling efforts, along with

  7. Low and high temperature susceptibility data of the Chicxulub Yax-1 drill core: link to magnetic carriers.

    NASA Astrophysics Data System (ADS)

    Elbra, T.; Pesonen, L. J.; Rebolledo-Vieyra, M.

    2005-05-01

    Temperature variations of weak-field magnetic susceptibility of Yax-1 drill core of the Chicxulub impact structure were examined in order to characterize magnetic minerals carrying the induced and remanent magnetization. Measurements were carried out at the Solid Earth Geophysics Laboratory, University of Helsinki, using KLY-3 kappabridge coupled with CS-3 temperature control. The applied temperature ranged from -192 °C to room temperature (low temperature treatment) and from ambient temperature to 700 °C (high temperature treatment). Both air and argon environments were used at high temperatures. Preliminary results show that in the impact samples there is a distinct change in the slope of the susceptibility vs. temperature curve at 450 °C. This possibly corresponds to titanomagnetite with relatively low Ti content. In some samples the data show also presence of nearly pure magnetite and/or pyrrhotite. Fe-Ti-oxides has been observed in impact rocks also before (Pilkington et al. 2004). Paleomagnetic data have previously (Elbra et al. 2004) shown that there are often two polarities present in same impact samples. Current data reveal also two magnetic carriers. We are now looking whether the polarity observations can be linked to these magnetic carriers. References Elbra, T., Pesonen, L.J., Kenkmann, T., Smit, J., 2004. A new preliminary paleomagnetic and petrophysical data of the Yaxcopoil drillcore, Chicxulub impact, Mexico. Geophysical Research Abstracts, EGU General Assembly, Nice, France. Volume 6. ISSN: 1029-7006. Pilkington, M., Ames, D. E.,Hildebrand A. R., 2004. Magnetic mineralogy of the Yaxcopoil-1 core, Chicxulub. Meteoritics & Planetary Science 39, Nr 6, 831-841

  8. A Mentoring Program Drills down on the Common Core

    ERIC Educational Resources Information Center

    Davis, Emily; Sinclair, Steve; Gschwend, Laura

    2015-01-01

    The Santa Cruz/Silicon Valley New Teacher Project--under the aegis of the New Teacher Center--devised a program to train teacher mentors to help new teachers incorporate the Common Core standards into their teaching. The three-year program yielded five critical lessons: Mentors need ongoing support to develop their readiness and willingness to…

  9. Preliminary report on the geology, geophysics and hydrology of USBM/AEC Colorado core hole No. 2, Piceance Creek Basin, Rio Blanco County, Colorado

    USGS Publications Warehouse

    Ege, J.R.; Carroll, R.D.; Welder, F.A.

    1967-01-01

    Approximately 1,400 feet of continuous core was taken .between 800-2,214 feet in depth from USBM/AEC Colorado core hole No. 2. The drill, site is located in the Piceance Creek basin, Rio Blanco County, Colorado. From ground surface the drill hole penetrated 1,120 feet of the Evacuation Creek Member and 1,094 feet of oil shale in the Parachute Creek Member of the Green River Formation. Oil shale yielding more than 20 gallons per ton occurs between 1,260-2,214 feet in depth. A gas explosion near the bottom of the hole resulted in abandonment of the exploratory hole which was still in oil shale. The top of the nahcolite zone is at 1,693 feet. Below this depth the core contains common to abundant amounts of sodium bicarbonate salt intermixed with oil shale. The core is divided into seven structural zones that reflect changes in joint intensity, core loss and broken core due to natural causes. The zone of poor core recovery is in the Interval between 1,300-1,450 feet. Results of preliminary geophysical log analyses indicate that oil yields determined by Fischer assay compare favorably with yields determined by geophysical log analyses. There is strong evidence that analyses of complete core data from Colorado core holes No. 1 and No. 2 reveal a reliable relationship between geophysical log response and oil yield. The quality of the logs is poor in the rich shale section and the possibility of repeating the logging program should be considered. Observations during drilling, coring, and hydrologic testing of USBM/AEC Colorado core hole No. 2 reveal that the Parachute Creek Member of the Green River Formation is the principal aquifer water in the Parachute Creek Member is under artesian pressure. The upper part of the aquifer has a higher hydrostatic head than, and is hydrologically separated from the lower part of the aquifer. The transmissibility of the aquifer is about 3500 gpd per foot. The maximum water yield of the core hole during testing was about 500 gpm. Chemical analyses of water samples indicate that the content of dissolved solids is low, the principal ions being sodium and bicarbonate. Although the hole was originally cored, to a depth of 2,214 feet, ,the present depth is about 2,100 feet. This report presents a preliminary evaluation of core examination, geophysical log interpretation and hydrological tests from the USBM/AEC Colorado core hole No. 2. The cooperation of the U.S. Bureau of Mines is gratefully acknowledged. The reader is referred to Carroll and others (1967) for comparison of USBM/AEC Col0rado core hole No. 1 with USBM/AEC Colorado core hole No. 2.

  10. Al26 depth profile in Apollo 15 drill core

    Microsoft Academic Search

    K. Nishiizumi; J. R. Arnold; J. Klein; R. Middleton

    1984-01-01

    Accelerator mass spectrometry is used in a study of galactic cosmic ray production profiles based on cosmic ray-produced Al-26 in the Apollo 15 long core. The results, which are in general agreement with earlier nondestructive counting data, are of significantly higher precision, yet systematically lower. The half-attenuation length for Al-26 production is presently calculated to be 122 g\\/sq cm, after

  11. The ICDP Hotspot Scientific Drilling Program: Overview of geophysical logging and seismic imaging through basaltic and rhyolitic volcanic deposits

    NASA Astrophysics Data System (ADS)

    Schmitt, D. R.; Liberty, L. M.; Kessler, J. A.; Kueck, J.; Kofman, R. S.; Bishop, R. A.; Shervais, J. W.; Evans, J. P.; Champion, D. E.

    2012-12-01

    The recently completed ICDP Hotspot drilling program consisted of drilling of three scientific drill holes each to at least 1800 m depth across the Snake River Plain of Idaho. The three boreholes include i) Kimama: thick sequences of basalt flows with sediment interbeds; ii) Kimberley: near surface basalt flows overlying rhyolite deposits, and iii) Mountain Home: geothermally altered basalts overlain by lacustrine sediments. The program consisted of high resolution 2D surface tied to vertical and walk-a-way borehole seismic profiles and an extensive suite of full waveform sonic, ultrasonic televiewer, electrical resistivity, magnetic susceptibility, and hydrogen index neutron logging. There are a number of highlights out of this work. First, seismic imaging beneath basalt flows is a classic problem in reflection seismology and has long been believed to be due to rapid attenuation of the downgoing seismic pulse. Here, however, we observed strong arrivals at all depths suggesting that seismic energy is penetrating such formations and that issues in imaging may be a result of the heterogeneous nature of the formations. Second, the neutron log responses correlate well with the structure of individual basalt flows. High and low backscattered neutron counts correspond to massive low porosity basalt rock and with the higher porosity and sediment filled flow tops, respectively. Third, the ultrasonic borehole televiewer information is being used to orient the nearly complete sets of core in order to obtain information on the azimuths of natural and drilling induced core fractures. This together with examination of borehole breakouts and drilling induced tensile fractures on the wellbore wall will allow for semi-quantitative stress estimates across the Snake River Plain. Finally, the Mountain Home borehole provides an unique opportunity to study the geothermally altered basalts. There are a number of correlations between, for example, the sonic and electrical logs that must relate to the style of alteration.

  12. Use of tracers to investigate drilling-fluid invasion and oil flushing during coring

    SciTech Connect

    Brown, A.; Marriott, F.T. (Texaco, Inc., Houston, TX (US))

    1988-11-01

    This work develops a method in which chemical tracers in the drilling fluid help determine mud filtrate invasion and the degree of oil flushing during coring of steamed and unsteamed heavy-oil formations. Salts of iodide and bromide were added to the drilling fluid while Well TO3 was cored through the Lombardi and Aurignac zones at San Ardo field in California. Vertical core plugs, taken from the periphery to the center of the retrieved whole core, were analyzed for tracer concentration. Tracer analyses indicated minimal filtrate invasion in the not-yet-steamflooded Lombardi zone and complete filtrate invasion in the steamflooded Aurignac zone. Tracer and oil saturation analyses showed the Lombardi zone to be uniform from top to bottom with an average oil saturation of 42.5% and an average porosity of 31.1%. Interpretation of tracer and oil saturation data permitted the construction of a layered model for the Aurignac zone. The layers ranged from an average oil saturation of 8% in the steamflooded layer to 37% in the bottom layer. The data showed that significant oil flushing (6%) occurred only in cores taken from the hot-waterflooded layer just below the steam zone. Vertical core-plug porosities and saturations, as determined by a unique calculating scheme, were compared with conventional and Elkins-corrected values. The comparison indicated that misapplication of the Elkins method in high-temperature formations may result in significant errors.

  13. Comparative evaluation of the indigenous microbial diversity vs. drilling fluid contaminants in the NEEM Greenland ice core.

    PubMed

    Miteva, Vanya; Burlingame, Caroline; Sowers, Todd; Brenchley, Jean

    2014-08-01

    Demonstrating that the detected microbial diversity in nonaseptically drilled deep ice cores is truly indigenous is challenging because of potential contamination with exogenous microbial cells. The NEEM Greenland ice core project provided a first-time opportunity to determine the origin and extent of contamination throughout drilling. We performed multiple parallel cultivation and culture-independent analyses of five decontaminated ice core samples from different depths (100-2051 m), the drilling fluid and its components Estisol and Coasol, and the drilling chips collected during drilling. We created a collection of diverse bacterial and fungal isolates (84 from the drilling fluid and its components, 45 from decontaminated ice, and 66 from drilling chips). Their categorization as contaminants or intrinsic glacial ice microorganisms was based on several criteria, including phylogenetic analyses, genomic fingerprinting, phenotypic characteristics, and presence in drilling fluid, chips, and/or ice. Firmicutes and fungi comprised the dominant group of contaminants among isolates and cloned rRNA genes. Conversely, most Proteobacteria and Actinobacteria originating from the ice were identified as intrinsic. This study provides a database of potential contaminants useful for future studies of NEEM cores and can contribute toward developing standardized protocols for contamination detection and ensuring the authenticity of the microbial diversity in deep glacial ice. PMID:24450335

  14. Mineralogic variation in drill core UE-25 UZ{number_sign}16, Yucca Mountain, Nevada

    SciTech Connect

    Chipera, S.J.; Vaniman, D.T.; Carlos, B.A.; Bish, D.L.

    1995-02-01

    Quantitative X-ray powder diffraction methods have been used to analyze 108 samples from drill core UE-25 UZ{number_sign}16 at Yucca Mountain, Nevada. This drill hole, located within the imbricate fault zone east of the potential Yucca Mountain repository site, confirms the authors` previous knowledge of gross-scale mineral distributions at Yucca Mountain and provides insight into possible shallow pathways for hydrologic recharge into the potential host rock. Analyses of samples from UE-25 UZ{number_sign}16 have shown that the distribution of major zeolitized horizons, of silica phases, and of glassy tuffs are similar to those noted in nearby drill cores. However, the continuous core and closer sample spacing in UE-25 UZ{number_sign}16 provide a more exact determination of mineral stratigraphy, particularly in hydrologically important units such as the Paintbrush bedded tuffs above the Topopah Spring Tuff and in the upper vitrophyre of the Topopah Spring Tuff. The discovery of matrix zeolitization in the devitrified Topopah Spring Tuff of UE25 UZ{number_sign}16 shows that some unexpected mineralogic features can still be encountered in the exploration of Yucca Mountain and emphasizes the importance of obtaining a more complete three-dimensional model of Yucca Mountain mineralogy.

  15. First CSDP (Continental Scientific Drilling Program)/thermal regimes core hole project at Valles Caldera, New Mexico (VC-1): Drilling report

    SciTech Connect

    Rowley, J.; Hawkins, W.; Gardner, J. (comps.)

    1987-02-01

    This report is a review and summary of the core drilling operations of the first Valles Caldera research borehole (VC-1) under the Thermal Regimes element of the Continental Scientific Drilling Program (CSDP). The project is a portion of a broader program that seeks to answer fundamental scientific questions about magma, rock/water interactions, and volcanology through shallow (<1-km) core holes at Long Valley, California; Salton Sea, California; and the Valles Caldera, New Mexico. The report emphasizes coring operations with reference to the stratigraphy of the core hole, core quality description, core rig specifications, and performance. It is intended to guide future research on the core and in the borehole, as well as have applications to other areas and scientific problems in the Valles Caldera. The primary objectives of this Valles Caldera coring effort were (1) to study the hydrogeochemistry of a subsurface geothermal outflow zone of the caldera near the source of convective upflow, (2) to obtain structural and stratigraphic information from intracaldera rock formations in the southern ring-fracture zone, and (3) to obtain continuous core samples through the youngest volcanic unit in Valles Caldera, the Banco Bonito rhyolite (approximately 0.1 Ma). All objectives were met. The high percentage of core recovery and the excellent quality of the samples are especially notable. New field sample (core) handling and documentation procedures were successfully utilized. The procedures were designed to provide consistent field handling of the samples and logs obtained through the national CSDP.

  16. Core formation, evolution, and convection: A geophysical model

    NASA Technical Reports Server (NTRS)

    Ruff, L.; Anderson, D. L.

    1978-01-01

    A model is proposed for the formation and evolution of the Earth's core which provides an adequate energy source for maintaining the geodynamo. A modified inhomogeneous accretion model is proposed which leads to initial iron and refractory enrichment at the center of the planet. The probable heat source for melting of the core is the decay of Al. The refractory material is emplaced irregularly in the lowermost mantle with uranium and thorium serving as a long lived heat source. Fluid motions in the core are driven by the differential heating from above and the resulting cyclonic motions may be the source of the geodynamo.

  17. Core Cracking and Hydrothermal Circulation Profoundly Affect Ceres' Geophysical Evolution

    NASA Astrophysics Data System (ADS)

    Neveu, Marc; Desch, Steven J.; Castillo-Rogez, Julie C.

    2014-11-01

    The dwarf planet (1)Ceres is about to be visited by the Dawn spacecraft [1]. In addition to a recent report of water vapor emission [2], observations and models of Ceres suggest that its evolution was shaped by interactions between liquid water and silicate rock [3,4].Hydrothermal processes in a heated core require both fractured rock and liquid. Using a new core cracking model coupled to a thermal evolution code [5], we find volumes of fractured rock always large enough for significant interaction to occur. Therefore, liquid persistence is key. It is favored by antifreezes such as ammonia [4], by silicate dehydration which releases liquid, and by hydrothermal circulation itself, which enhances heat transport into the hydrosphere. The heating effect from silicate hydration seems minor. Hydrothermal circulation can profoundly affect Ceres' evolution: it prevents core dehydration via “temperature resets”, global cooling events lasting ~50 Myr, followed by ~1 Gyr periods during which Ceres' interior is nearly isothermal and its hydrosphere largely liquid. Whether Ceres has experienced such extensive hydrothermalism may be determined through examination of its present-day structure. A large, fully hydrated core (radius 420 km) suggests that extensive hydrothermal circulation prevented core dehydration. A small, dry core (radius 350 km) suggests early dehydration from short-lived radionuclides, with shallow hydrothermalism at best. Intermediate structures with a partially dehydrated core seem ambiguous, compatible both with late partial dehydration without hydrothermal circulation, and with early dehydration with extensive hydrothermal circulation. Thus, gravity measurements by the Dawn orbiter [1] could help discriminate between scenarios for Ceres' evolution.References:[1] Russell C. T. & Raymond C. A. (2011) Sp. Sci. Rev. 163, 3-23.[2] Küppers M. et al. (2014) Nature 505, 525-527.[3] Rivkin A. et al. (2011) Sp. Sci. Rev. 163, 95-116.[4] Castillo-Rogez J. C. & McCord T. B. (2010) Icarus 205, 443-459.[5] Neveu M., Desch S. J. & Castillo-Rogez J. C., submitted.

  18. Geochemistry of drill core headspace gases and its significance in gas hydrate drilling in Qilian Mountain permafrost

    NASA Astrophysics Data System (ADS)

    Lu, Zhengquan; Rao, Zhu; He, Jiaxiong; Zhu, Youhai; Zhang, Yongqin; Liu, Hui; Wang, Ting; Xue, Xiaohua

    2015-02-01

    Headspace gases from cores are sampled in the gas hydrate drilling well DK-8 in the Qilian Mountain permafrost. Gas components and carbon isotopes of methane from headspace gas samples are analyzed. The geochemical features of the headspace gases along the well profile are compared with occurrences of gas hydrate, and with the distribution of faults or fractures. Their geochemical significance is finally pointed out in gas hydrate occurrences and hydrocarbon migration. Results show high levels of hydrocarbon concentrations in the headspace gases at depths of 149-167 m, 228-299 m, 321-337 m and 360-380 m. Visible gas hydrate and its associated anomalies occur at 149-167 m and 228-299 m; the occurrence of high gas concentrations in core headspace gases was correlated to gas hydrate occurrences and their associated anomalies, especially in the shallow layers. Gas compositions, gas ratios of C1/?C1-5, C1/(C2 + C3), iC4/nC4, and iC5/nC5, and carbon isotopic compositions of methane (?13C1, PDB‰) indicate that the headspace gases are mainly thermogenic, partly mixed with biodegraded thermogenic sources with small amounts derived from microbial sources. Faults or fracture zones are identified at intervals of 149-167 m, 228-299 m, 321-337 m, and near 360-380 m; significantly higher gas concentrations and lower dryness ratio were found in the headspace gases within the fault or fracture zones compared with areas above these zones. In the shallow zones, low dryness ratios were observed in headspace gases in zones where gas hydrate and faults or fracture zones were found, suggesting that faults or fracture zones serve as migration paths for gases in the deep layers and provide accumulation space for gas hydrate in the shallow layers of the Qilian Mountain permafrost.

  19. Procedures for use of, and drill cores and cuttings available for study at, the Lithologic Core Storage Library, Idaho National Engineering Laboratory, Idaho

    SciTech Connect

    Davis, L.C.; Hannula, S.R.; Bowers, B.

    1997-03-01

    In 1990, the US Geological Survey, in cooperation with the US Department of Energy, Idaho Operations Office, established the Lithologic Core Storage Library at the Idaho National Engineering Laboratory (INEL). The facility was established to consolidate, catalog, and permanently store nonradioactive drill cores and cuttings from investigations of the subsurface conducted at the INEL, and to provide a location for researchers to examine, sample, and test these materials. The facility is open by appointment to researchers for examination, sampling, and testing of cores and cuttings. This report describes the facility and cores and cuttings stored at the facility. Descriptions of cores and cuttings include the well names, well locations, and depth intervals available. Most cores and cuttings stored at the facility were drilled at or near the INEL, on the eastern Snake River Plain; however, two cores drilled on the western Snake River Plain are stored for comparative studies. Basalt, rhyolite, sedimentary interbeds, and surficial sediments compose the majority of cores and cuttings, most of which are continuous from land surface to their total depth. The deepest core stored at the facility was drilled to 5,000 feet below land surface. This report describes procedures and researchers` responsibilities for access to the facility, and examination, sampling, and return of materials.

  20. Procedures for use of, and drill cores and cuttings available for study at, the Lithologic Core Storage Library, Idaho National Engineering Laboratory, Idaho

    Microsoft Academic Search

    L. C. Davis; S. R. Hannula; B. Bowers

    1997-01-01

    In 1990, the US Geological Survey, in cooperation with the US Department of Energy, Idaho Operations Office, established the Lithologic Core Storage Library at the Idaho National Engineering Laboratory (INEL). The facility was established to consolidate, catalog, and permanently store nonradioactive drill cores and cuttings from investigations of the subsurface conducted at the INEL, and to provide a location for

  1. The Olorgesailie Drilling Project (ODP): a high-resolution drill core record from a hominin site in the East African Rift Valley

    NASA Astrophysics Data System (ADS)

    Dommain, R.; Potts, R.; Behrensmeyer, A. K.; Deino, A. L.

    2014-12-01

    The East African rift valley contains an outstanding record of hominin fossils that document human evolution over the Plio-Pleistocene when the global and regional climate and the rift valley itself changed markedly. The sediments of fossil localities typically provide, however, only short time windows into past climatic and environmental conditions. Continuous, long-term terrestrial records are now becoming available through core drilling to help elucidate the paleoenvironmental context of human evolution. Here we present a 500,000 year long high-resolution drill core record obtained from a key fossil and archeological site - the Olorgesailie Basin in the southern Kenya Rift Valley, well known for its sequence of archeological and faunal sites for the past 1.2 million years. In 2012 two drill cores (54 and 166 m long) were collected in the Koora Plain just south of Mt. Olorgesailie as part of the Olorgesailie Drilling Project (ODP) to establish a detailed climate and ecological record associated with the last evidence of Homo erectus in Africa, the oldest transition of Acheulean to Middle Stone Age technology, and large mammal species turnover, all of which are documented in the Olorgesailie excavations. The cores were sampled at the National Lacustrine Core Facility. More than 140 samples of tephra and trachytic basement lavas have led to high-precision 40Ar/39Ar dating. The cores are being analyzed for a suite of paleoclimatic and paleoecological proxies such as diatoms, pollen, fungal spores, phytoliths, ostracodes, carbonate isotopes, leaf wax biomarkers, charcoal, and clay mineralogy. Sedimentological analyses, including lithological descriptions, microscopic smear slide analysis (242 samples), and grain-size analysis, reveal a highly variable sedimentary sequence of deep lake phases with laminated sediments, diatomites, shallow lake and near shore phases, fluvial deposits, paleosols, interspersed carbonate layers, and abundant volcanic ash deposits. Magnetic susceptibility indicates climatic variation potentially related to precessional cycles.

  2. Study of Hydrothermal Mineralization in 2013 Drill Core from Hawaii Island

    NASA Astrophysics Data System (ADS)

    Lautze, N. C.; Calvin, W. M.; Moore, J.; Haskins, E.; Thomas, D. M.

    2014-12-01

    The Humu'ula Groundwater Research Project (HGRP) drilled a continuously-cored hole to nearly 2 km depth near the Saddle Road between Mauna Loa and Mauna Kea volcanoes on Hawaii Island in March of 2013. Temperatures at the bottom of the hole were unexpectedly high and reached over 100 C. A study is underway to characterize hydrothermal (secondary) mineralization in the core at depths below ~ 1 km. Secondary mineralization can indicate the presence, chemistry, and temperature of hydrothermal fluids, therein helping to characterize a present and/or past geothermal system. To date, the study is two pronged. In collaboration with University Nevada Reno (UNR) we used an Analytical Spectral Devices (ASD) FieldSpec instrument to obtain nearly 800 spectra from core depths spanning 3190 to 5785 feet. This device has a 2 cm contact probe that measures from 0.4 to 2.5 mm, and has been used successfully by UNR to identify depth-associated changes in alteration mineralogy and zoning in drill core from other pilot studies. The spectra indicate that rocks above a depth of ~1 km are only weakly altered. At greater depths to the base of the well, chlorite, possibly with some mica, and zeolites are common. The majority of zeolites are spectrally similar to each other at these wavelengths, however analcime and natrolite are uniquely identified in some sections. Epidote was not observed. The secondary mineral assemblages suggest that the alteration was produced by moderate temperature neutral pH fluids. Here, we used the spectral data as a survey tool to help identify and select over 20 sections of core for sampling and more detailed mineralogical analysis using traditional X-Ray Diffraction (XRD) and petrographic techniques, conducted in collaboration with University of Utah. This presentation will include mineral maps with depth and results of the petrographic analyses.

  3. Interrelating the breakage and composition of mined and drill core coal

    NASA Astrophysics Data System (ADS)

    Wilson, Terril Edward

    Particle size distribution of coal is important if the coal is to be beneficiated, or if a coal sales contract includes particle size specifications. An exploration bore core sample of coal ought to be reduced from its original cylindrical form to a particle size distribution and particle composition that reflects, insofar as possible, a process stream of raw coal it represents. Often, coal cores are reduced with a laboratory crushing machine, the product of which does not match the raw coal size distribution. This study proceeds from work in coal bore core reduction by Australian investigators. In this study, as differentiated from the Australian work, drop-shatter impact breakage followed by dry batch tumbling in steel cylinder rotated about its transverse axis are employed to characterize the core material in terms of first-order and zeroth-order breakage rate constants, which are indices of the propensity of the coal to degrade during excavation and handling. Initial drop-shatter and dry tumbling calibrations were done with synthetic cores composed of controlled low-strength concrete incorporating fly ash (as a partial substitute for Portland cement) in order to reduce material variables and conserve difficult-to-obtain coal cores. Cores of three different coalbeds--Illinois No. 6, Upper Freeport, and Pocahontas No. 5 were subjected to drop-shatter and dry batch tumbling tests to determine breakage response. First-order breakage, characterized by a first-order breakage index for each coal, occurred in the drop-shatter tests. First- and zeroth-order breakage occurred in dry batch tumbling; disappearance of coarse particles and creation of fine particles occurred in a systematic way that could be represented mathematically. Certain of the coal cores available for testing were dry and friable. Comparison of coal preparation plant feed with a crushed bore core and a bore core prepared by drop-shatter and tumbling (all from the same Illinois No.6 coal mining property) indicated that the size distribution and size fraction composition of the drop-shattered/tumbled core more closely resembled the plant feed than the crushed core. An attempt to determine breakage parameters (to allow use of selection and breakage functions and population balance models in the description of bore core size reduction) was initiated. Rank determination of the three coal types was done, indicating that higher rank associates with higher breakage propensity. The two step procedure of drop-shatter and dry batch tumbling simulates the first-order (volume breakage) and zeroth-order (abrasion of particle surfaces) that occur in excavation and handling operations, and is appropriate for drill core reduction prior to laboratory analysis.

  4. The COSC-1 drill core - a geological sample through a hot allochthon and the underlying thrust zone

    NASA Astrophysics Data System (ADS)

    Lorenz, Henning; Almqvist, Bjarne; Berthet, Théo; Klonowska, Iwona

    2015-04-01

    The ICDP (International Continental Scientific Drilling Program) supported Collisional Orogeny in the Scandinavian Caledonides (COSC) scientific drilling project has the aim to study mountain building processes in a major Paleozoic orogen. COSC-1, drilled in 2014 near Åre (Sweden), was planned to sample a section from the hot allochthon of the Lower Seve Nappe through the thrust zone and into the underlying less metamorphic rocks of the Särv and/or Jämtlandian nappes. Diamond core drilling operations resulted in 2396.0 m of drill core with only about 2.5 m documented core loss (technical failure of the core catcher). Down to about 1800 m, the COSC-1 drill hole penetrated a succession that is dominated by gneisses of varying compositions (felsic, amphibole, calc-silicate gneisses, and more), often garnet and diopside bearing. Meta-gabbros and amphibolites are common and apparently correlate well with seismic reflectors between 500 and 1000 m depth. Also marbles, pegmatite dykes and minor mylonites occur. These rocks are highly strained. Small scale structures (e.g. isoclinal folding) are occasionally discernible in the narrow section provided by the drill cores. (Young) Fractures are sparse. Only a set of very steep fractures results in fluid conduction zones at several levels throughout the drill hole. At 175 m and between 1200 and 1300 m, this results in the dissolution of calcite-rich bands in the gneisses to form "micro-karst". First signs of the thrust zone below the Seve Nappe appear just below 1700 m in form of narrow deformation bands and thin mylonites. The mylonites increase in thickness and reach a thickness of around 1 m between 1900 and 2000 m. Below c. 2100 m, mylonites are dominating and garnets become common (but are not present in all mylonites). The deepest rock of mafic origin (possibly amphibolite in the Seve Nappe) was identified at 2314 m, a transition from gneiss into lower grade metasedimentary rocks occurs between 2345 and 2360 m. The lower part of the drill core to TD is dominated by quartzites and meta-arkoses (field name) of unclear tectonostratigraphic position that are mylonitised to varying degree. The drill hole does not penetrate the base of the thrust zone. The rocks sampled in the lowermost part of the drill core are the thickest mylonites encountered, tens of metres thick and (again) rich in garnet. Geological conclusions with relevance to mountain building have to wait for detailed analysis of the drill core. However, direct observations are: - The gneisses of the Lower Seve Nappe are much more homogenous than expected. - Thick (hundreds of metres) mafic bodies (Arnbom 1980, and unpublished geological maps) are absent. The maximum thickness in the drill core is about 30 m. - The thrust zone below the Seve Nappe is much thicker than expected. After more than 500 m the lower boundary was not encountered. - The drill hole seems to leave the Seve Nappe and enter lower grade metamorphic rocks. However, the mylonites at the bottom of the drill hole contain many and large garnets (up to cm size).

  5. Tecuamburro Volcano, Guatemala geothermal gradient core hole drilling, operations, and preliminary results

    SciTech Connect

    Goff, S.; Heiken, G.; Goff, F.; Gardner, J. (Los Alamos National Lab., NM (USA)); Duffield, W. (Geological Survey, Flagstaff, AZ (USA)); Martinelli, L.; Aycinena, S. (Swissboring Overseas Corp. Ltd., Guatemala City (Guatemala)); Castaneda, O. (Unidad de Desarrollo Geotermico, Guatemala City (Guatemala). Inst. Nacional de Electrificacion)

    1990-01-01

    A geothermal gradient core hole (TCB-1) was drilled to a depth of 700+ m at the Tecuamburro geothermal site, Guatemala during February and March, 1990. The core hole is located low on the northern flank of the Tecuamburro Volcano complex. Preliminary analysis of cores (>98% core recovery) indicates that the hydrothermal system may be centered in the 4-km-diameter Chupadero Crater, which has been proposed as the source of pyroxene pumice deposits in the Tecuamburro area. TCB-1 is located 300 m south of a 300-m-diameter phreatic crater, Laguna Ixpaco; the core hole penetrates the thin edge of a tuff ring surrounding Ixpaco and zones of hydrothermal brecciation within the upper 150 m may be related to the phreatic blast, dated at 2,910 {sup 14}C years. At the time of this writing, the unequilibrated temperature at a depth of 570m was 180{degree}C. Data on fracturing, permeability, hydrothermal alteration, and temperature will be presented. 3 refs., 3 figs.

  6. Design And Operation Of A Wireline Pressure Core Sampler (PCS) OCEAN DRILLING PROGRAM

    E-print Network

    system controlling 12 thrusters, to dynamically position the ship over a drill hole located in water compensator, the drilling system can handle 9,150 meters of drill pipe. The JOIDES Resolution recently

  7. Geophysics

    NSDL National Science Digital Library

    Susan Slaymaker

    This website contains abbreviated course notes from a geophysics class at California State University at Sacramento. The notes contain topic summaries and formulas, including gravity, Newton's laws, radioactivity, radioactive decay, Rb/Sr dating, Uranium-Thorium-Lead dating, uses of Lead, fission-track dating, Potassium-Argon dating, Carbon dating, heat, magnetism, seismology and earthquake prediction.

  8. Microbial Ecosystem In The Oldest Freshwater Lake Revealed From A Drill Core Of The 2.76 Ga Hardey Formation, Pilbara District, Western Australia

    Microsoft Academic Search

    Y. Watanabe; D. C. Bevacqua; H. Ohmoto

    2004-01-01

    The Hardey Formation in the Pilbara district of Western Australia, is the oldest known (2.76 Ga) lacustrine deposit, was one of eight targets of the Archean Biosphere Drilling Project (ABDP). Rocks in the drilling area have been subjected to very low-grade metamorphism (zeolites facies). The recovered drill core (~145 m in depth) is divisible into two depth zones: (1) the

  9. A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core

    NASA Astrophysics Data System (ADS)

    Rasmussen, S. O.; Abbott, P. M.; Blunier, T.; Bourne, A. J.; Brook, E.; Buchardt, S. L.; Buizert, C.; Chappellaz, J.; Clausen, H. B.; Cook, E.; Dahl-Jensen, D.; Davies, S. M.; Guillevic, M.; Kipfstuhl, S.; Laepple, T.; Seierstad, I. K.; Severinghaus, J. P.; Steffensen, J. P.; Stowasser, C.; Svensson, A.; Vallelonga, P.; Vinther, B. M.; Wilhelms, F.; Winstrup, M.

    2013-12-01

    A stratigraphy-based chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core has been derived by transferring the annual layer counted Greenland Ice Core Chronology 2005 (GICC05) and its model extension (GICC05modelext) from the NGRIP core to the NEEM core using 787 match points of mainly volcanic origin identified in the electrical conductivity measurement (ECM) and dielectrical profiling (DEP) records. Tephra horizons found in both the NEEM and NGRIP ice cores are used to test the matching based on ECM and DEP and provide five additional horizons used for the timescale transfer. A thinning function reflecting the accumulated strain along the core has been determined using a Dansgaard-Johnsen flow model and an isotope-dependent accumulation rate parameterization. Flow parameters are determined from Monte Carlo analysis constrained by the observed depth-age horizons. In order to construct a chronology for the gas phase, the ice age-gas age difference (?age) has been reconstructed using a coupled firn densification-heat diffusion model. Temperature and accumulation inputs to the ?age model, initially derived from the water isotope proxies, have been adjusted to optimize the fit to timing constraints from ?15N of nitrogen and high-resolution methane data during the abrupt onset of Greenland interstadials. The ice and gas chronologies and the corresponding thinning function represent the first chronology for the NEEM core, named GICC05modelext-NEEM-1. Based on both the flow and firn modelling results, the accumulation history for the NEEM site has been reconstructed. Together, the timescale and accumulation reconstruction provide the necessary basis for further analysis of the records from NEEM.

  10. Geologic and geophysical data for wells drilled at Raft River Valley, Cassia County, Idaho, in 1977-1978 and data for wells drilled previously

    USGS Publications Warehouse

    Nathenson, Manuel; Urban, Thomas C.; Covington, Harry R.

    2014-01-01

    For purposes of defining the thermal anomaly for the geothermal system, temperature gradients are calculated over long depth intervals on the basis of the appearance of reasonable linear segments on a temperature versus plot depth.  Temperature versus depth data for some drill holes can be represented by a single gradient, whereas others require multiple gradients to match the data.  Data for some drill holes clearly reflect vertical flows of water in the formation surrounding the drill holes, and water velocities are calculated for these drill holes.  Within The Narrows area, temperature versus depth data show reversals at different depth in different drill holes.  In the main thermal area, temperatures in intermediate-depth drill holes vary approximately linearly but with very high values of temperature gradient.  Temperature gradients on a map of the area can be reasonable divided into a large area of regional gradients and smaller areas defining the thermal anomalies.

  11. Environmental sampling and mud sampling program of CSDP (Continental Scientific Drilling Program) core hole VC-2B, Valles Caldera, New Mexico

    SciTech Connect

    Meeker, K.; Goff, F.; Gardner, J.N.; Trujillo, P.E.; Counce, D.

    1990-03-01

    An environmental sampling and drilling mud sampling program was conducted during the drilling operations of Continental Scientific Drilling Program (CSDP) core hole VC-2B, Valles caldera, New Mexico. A suite of four springs and creeks in the Sulphur Springs area were monitored on a regular basis to ensure that the VC-2B drilling program was having no environmental impact on water quality. In addition, a regional survey of springs in and around the Jemez Mountains was conducted to provide background data for the environmental monitoring. A drilling mud monitoring program was conducted during the operations to help identify major fluid entries in the core hole. 32 refs., 14 figs., 7 tabs.

  12. Improving the Accuracy of Core Location and Recovery Estimates Through the Integration of Core Data, Wireline Logs and Drilling Parameters: an Example From IODP Expedition 310, Tahiti Sea Level

    Microsoft Academic Search

    J. Inwood; T. Brewer; H. Braaksma; P. Pezard

    2007-01-01

    In palaeoclimate and sea-level studies accurate depth positioning of core pieces is critical in assessing the usefulness of a specific drill site. The location and amounts of core recovered during a drilling program can often place severe constraints on the subsequent applications of core measurements. The principle objectives of Expedition 310 are to establish the course of postglacial sea level

  13. Lithologic and geophysical logs of drill holes Felderhoff Federal 5-1 and 25-1, Amargosa Desert, Nye County, Nevada

    SciTech Connect

    Carr, W.J.; Grow, J.A. [Geological Survey, Denver, CO (United States); Keller, S.M. [Science Applications International Corp., Golden, CO (United States)

    1995-10-01

    Two wildcat oil and gas exploration holes drilled in 1991 on the northern edge of the Amargosa Desert penetrated Tertiary and Quaternary sedimentary rocks, alluvium, and basalt, possible Tertiary volcanic or volcaniclastic rocks, and Tertiary (?) and Paleozoic carbonate rocks. The easternmost of the two holes, Felderhoff-Federal 5-1, encountered about 200 feet of alluvium, underlain by 305 feet of basalt breccia and basalt, about 345 feet of probable Tertiary tuffaceous sedimentary rocks, and 616 feet of dense limestone and dolomite of uncertain age. Drill hole 25-1 penetrated 240 feet of alluvium and marl (?), and 250 feet of basalt breccia (?) and basalt, 270 feet of tuff (?) and/or tuffaceous sedimentary rocks, 360 feet of slide blocks (?) and large boulders of Paleozoic carbonate rocks, and 2,800 feet of Paleozoic limestone and dolomite. The two drill holes are located within a northerly trending fault zone defined largely by geophysical data; this fault zone lies along the east side of a major rift containing many small basalt eruptive centers and, farther north, several caldera complexes. Drill hole 25-1 penetrated an inverted paleozoic rock sequence; drill hole 5-1 encountered two large cavities 24-inches wide or more in dense carbonate rock of uncertain, but probable Paleozoic age. These openings may be tectonic and controlled by a regional system of northeast-striking faults.

  14. U.S. geological survey core drilling on the Atlantic shelf

    USGS Publications Warehouse

    Hathaway, J.C.; Poag, C.W.; Valentine, P.C.; Miller, R.E.; Schultz, D.M.; Manheim, F. T.; Kohout, F.A.; Bothner, Michael H.; Sangrey, D.A.

    1979-01-01

    The first broad program of scientific shallow drilling on the U.S. Atlantic continental shelf has delineated rocks of Pleistocene to Late Cretaceous age, including phosphoritic Miocene strata, widespread Eocene carbonate deposits that serve as reflective seismic markers, and several regional unconformities. Two sites, off Maryland and New Jersey, showed light hydrocarbon gases having affinity to mature petroleum. Pore fluid studies showed that relatively fresh to brackish water occurs beneath much of the Atlantic continental shelf, whereas increases in salinity off Georgia and beneath the Florida-Hatteras slope suggest buried evaporitic strata. The sediment cores showed engineering properties that range from good foundation strength to a potential for severe loss of strength through interaction between sediments and manmade structures. Copyright ?? 1979 AAAS.

  15. Petrology and geochemistry of lithic fragments separated from the Apollo 15 deep-drill core

    NASA Technical Reports Server (NTRS)

    Lindstrom, M. M.; Nielsen, R. L.; Drake, M. J.

    1977-01-01

    Petrological and geochemical analysis of lithic fragments separated from the Apollo 15 deep-drill core showed these fragments to fall into the essentially the same range of rock types as observed in surface soil samples and large rock samples. Three particles are singled out as being of special interest. One sample is a mare basalt containing extremely evolved phases. The particle may represent small-scale imperfect crystal/liquid separation in a lava flow. A green glass particle is not the ultramafic emerald green glass described from the Apollo 15 site, but rather an ANT-like light green color, and has a quite different chemical composition from the ultramafic variety. One mare basalt displays a positive Eu anomaly and is enriched in plagioclase relative to olivine plus pyroxene.

  16. Petrography of shock features in the 1953 Manson 2-A drill core

    NASA Astrophysics Data System (ADS)

    Short, N. M.; Gold, D. P.

    1993-03-01

    Drilling of Nx core in late 1953 into an anomalous zone of disturbed rocks northwest of Manson, Iowa disclosed presence of extensive breccias including crystalline rocks brought to the surface from depths of 4 km or more. Hole 2-A penetrated breccias dominated by leucocratic igneous and metamorphic lithologies, later interpreted to be part of a general ringed peak complex within a 35 km wide impact structure produced about 65 Ma ago. Proof of this origin was given in 1966 by NMS through recognition of shock metamorphic features in 2-A materials during a cursory examination of samples provided by R.A. Hoppin, University of Iowa. A detailed study of this material now underway has revealed that most breccia clasts in 2-A show abundant and varied evidence of shock damage, including extensive planar deformation features (PDF) in quartz, K-feldspar, plagioclase, and a pyroxene and varying degrees of isotropization and incipient melting in feldspars.

  17. Geology and geochemistry of shallow drill cores from the Bosumtwi impact struture, Ghana

    NASA Astrophysics Data System (ADS)

    Boamah, D.; Koeberl, C.

    2003-08-01

    The 1.07 Ma well-preserved Bosumtwi impact structure in Ghana (10.5 km in diameter) formed in 2 Ga-old metamorphosed and crystalline rocks of the Birimian system. The interior of the structure is largely filled by the 8 km diameter Lake Bosumtwi, and the crater rim and region in the environs of the crater is covered by tropical rainforest, making geological studies rather difficult and restricted to road cuts and streams. In early 1999, we undertook a shallow drilling program to the north of the crater rim to determine the extent of the ejecta blanket around the crater and to obtain subsurface core samples for mineralogical, petrological, and geochemical studies of ejecta of the Bosumtwi impact structure. A variety of impactite lithologies are present, consisting of impact glass- rich suevite and several types of breccia: lithic breccia of single rock type, often grading into unbrecciated rock, with the rocks being shattered more or less in situ without much relative displacement (autochthonous?), and lithic polymict breccia that apparently do not contain any glassy material (allochtonous?). The suevite cores show that melt inclusions are present throughout the whole length of the cores in the form of vesicular glasses with no significant change of abundance with depth. Twenty samples from the 7 drill cores and 4 samples from recent road cuts in the structure were studied for their geochemical characteristics to accumulate a database for impact lithologies and their erosion products present at the Bosumtwi crater. Major and trace element analyses yielded compositions similar to those of the target rocks in the area (graywacke-phyllite, shale, and granite). Graywacke-phyllite and granite dikes seem to be important contributors to the compositions of the suevite and the road cut samples (fragmentary matrix), with a minor contribution of Pepiakese granite. The results also provide information about the thickness of the fallout suevite in the northern part of the Bosumtwi structure, which was determined to be 15 m and to occupy an area of ~1.5 km2. Present suevite distribution is likely to be caused by differential erosion and does not reflect the initial areal extent of the continuous Bosumtwi ejecta deposits. Our studies allow a comparison with the extent of the suevite at the Ries, another well-preserved impact structure.

  18. Multiple Geophysical Observations by a newly developed multi-component borehole instrument at the Continental Deep Drilling Site of the CCSD, Donghai, China

    Microsoft Academic Search

    J. Xu; Z. Zhao; H. Ishii; T. Yamauchi

    2004-01-01

    Multiple Geophysical Observations by a newly developed multi-component borehole instrument at the Continental Deep Drilling Site of the CCSD, Donghai, China Jiren Xu1 (+86-10-68992879; xujiren@ccsd.org.cn) Zhixin Zhao1 (+86-10-68999734; zhaozhixin@ccsd.org.cn) Hiroshi Ishii2 (+81-0572-67-3105; ishii@tries.gr.jp Tsuneo Yamauchi3 (+81-052-789-3045; yamauchi@seis.nagoya-u.ac.jp) 1 Institute of Geology, Chinese Academy of Geological Sciences, China 2 Tono Research Institute of Earthquake Science (TRIES), Japan 3 Graduate School of

  19. Yucatan Subsurface Stratigraphy from Geophysical Data, Well Logs and Core Analyses in the Chicxulub Impact Crater and Implications for Target Heterogeneities

    NASA Astrophysics Data System (ADS)

    Canales, I.; Fucugauchi, J. U.; Perez-Cruz, L. L.; Camargo, A. Z.; Perez-Cruz, G.

    2011-12-01

    Asymmetries in the geophysical signature of Chicxulub crater are being evaluated to investigate on effects of impact angle and trajectory and pre-existing target structural controls for final crater form. Early studies interpreted asymmetries in the gravity anomaly in the offshore sector to propose oblique either northwest- and northeast-directed trajectories. An oblique impact was correlated to the global ejecta distribution and enhanced environmental disturbance. In contrast, recent studies using marine seismic data and computer modeling have shown that crater asymmetries correlate with pre-existing undulations of the Cretaceous continental shelf, suggesting a structural control of target heterogeneities. Documentation of Yucatan subsurface stratigraphy has been limited by lack of outcrops of pre-Paleogene rocks. The extensive cover of platform carbonate rocks has not been affected by faulting or deformation and with no rivers cutting the carbonates, information comes mainly from the drilling programs and geophysical surveys. Here we revisit the subsurface stratigraphy in the crater area from the well log data and cores retrieved in the drilling projects and marine seismic reflection profiles. Other source of information being exploited comes from the impact breccias, which contain a sampling of disrupted target sequences, including crystalline basement and Mesozoic sediments. We analyze gravity and seismic data from the various exploration surveys, including multiple Pemex profiles in the platform and the Chicxulub experiments. Analyses of well log data and seismic profiles identify contacts for Lower Cretaceous, Cretaceous/Jurassic and K/Pg boundaries. Results show that the Cretaceous continental shelf was shallower on the south and southwest than on the east, with emerged areas in Quintana Roo and Belize. Mesozoic and upper Paleozoic sediments show variable thickness, possibly reflecting the crystalline basement regional structure. Paleozoic and Precambrian basement outcrops are located farther to the southeast in Belize and northern Guatemala. Inferred shelf paleo-bathymetry supports existence of a sedimentary basin extending to the northeast, where crater rim and terrace zones are subdued in the seismic images.

  20. The ICDP Dead Sea deep drill cores: records of climate change and tectonics in the Levant

    NASA Astrophysics Data System (ADS)

    Goldstein, S. L.; Stein, M.; Ben-Avraham, Z.; Agnon, A.; Ariztegui, D.; Brauer, A.; Haug, G. H.; Ito, E.; Kitagawa, H.; Torfstein, A.

    2012-12-01

    The Dead Sea drainage basin sits at the boundary of the Mediterranean and the Saharan climate zones, and the basin is formed by the Dead Sea transform fault. The ICDP-funded Dead Sea Deep Drilling Project recovered the longest and most complete paleo-environmental and paleo-seismic record in the Middle East, drilling holes of ~450 and ~350 meters in deep (~300 m below the lake level) and shallow sites (~3 m), respectively, and. The sediments record the evolving environmental conditions (e.g. droughts, rains, floods, dust-storms), as well as tectonics (earthquake layers). The core can be dated using 14C on organic materials, U-Th on inorganic aragonite, stable isotopes, and layer counting. They were opened, described, and XRF-scanned during June to November 2011, the first sampling party took place in July 2012, and study is now underway. Some important conclusions can already be drawn. The stratigraphy reflects the climate conditions. During wet climate intervals the lithology is typically varve-like laminated aragonite and detritus (aad), reflecting summer and winter seasons, respectively, and sequences of mud. Gypsum layers reflect more arid climate, and salt (halite) indicates extreme aridity. The Dead Sea expands during glacials, and the portion of the core that corresponds to the last glacial Lisan Formation above the shoreline is easily recognized in the core based on the common lithological sequence, and this allows us to infer a broad scale age model. Interglacials show all the lithologic facies (aad, mud, gypsum, salt), reflecting extreme climate variability, while glacials contain the aad, mud, and gypsum but lack salt layers. Thus we estimate that the deep site hole extends into MIS 7 (to ~200,000 years). Thin (up to several cm thick) seismic layers occur throughout the core, but thick (up to several meters) landslide deposits only occur during glacial intervals. The most dramatic discovery is evidence of an extreme dry interval during MIS 5 at the deep site. There is a ~40 cm thick interval of partly rounded pebbles in the core at ~235 m below the lake floor. It is the only clean pebbly unit in the core, and resembles a beach deposit. Below the layer there is ~45 meters of mainly salt. These observations indicate a severe dry interval during MIS 5. This observation has implications for the Middle East today, where the Dead Sea level is dropping at rates >1m/year, as all the countries in the area are using all the runoff. GCM models indicate a more arid future in the region. The core shows that the runoff nearly stopped during the last interglacial without human intervention. Dating is underway to constrain the timing of the extreme drydown.

  1. Workshop on core and sample curation for the National Continental Scientific Drilling Program

    SciTech Connect

    Goff, S.; Heiken, G. (eds.)

    1981-05-06

    The Workshop on Core and Sample Curation was held to discuss the best means of handling, distributing, and advertising samples and data collected during a Continental Scientific Drilling Program (CSDP) and to establish better communication between sample curators regarding common problems. It was geneerally agreed that CSDP samples should be handled, on a regional basis, by existing data systems and sample repositories judged to have adequate staff and support. Repository design, sample handling procedures, and sample accounting systems were discussed. Across North America, support for curation of geological samples was varied, but it was strongest within states or regions with well-established energy and mineral industries. A well-supported repository pays for itself through the circulation and preservation of samples and stratigraphic information. A national CSDP must have a well-established curatorial policy and system of regional repositories to circulate information and samples throughout the scientific community. Well-curated samples and data are a national resource with considerable benefits for industry and academia. Attendees agreed to form a Society of Geoscience Curators to maintain communication between curators from private, government, and university repositories and core research laboratories.

  2. Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS)

    NASA Astrophysics Data System (ADS)

    Vallelonga, P.; Christianson, K.; Alley, R. B.; Anandakrishnan, S.; Christian, J. E. M.; Dahl-Jensen, D.; Gkinis, V.; Holme, C.; Jacobel, R. W.; Karlsson, N.; Keisling, B. A.; Kipfstuhl, S.; Kjær, H. A.; Kristensen, M. E. L.; Muto, A.; Peters, L. E.; Popp, T.; Riverman, K. L.; Svensson, A. M.; Tibuleac, C.; Vinther, B. M.; Weng, Y.; Winstrup, M.

    2014-01-01

    The Northeast Greenland Ice Stream (NEGIS) is the sole interior Greenlandic ice stream. Fast flow initiates near the summit dome, and the ice stream terminates approximately 1000 km downstream in three large outlet glaciers that calve into the Greenland Sea. To better understand this important system, in the summer of 2012 we drilled a 67 m firn core and conducted ground-based radio-echo sounding (RES) and active-source seismic surveys at a site approximately 150 km downstream from the onset of streaming flow (NEGIS firn core, 75° 37.61' N, 35°56.49' W). The site is representative of the upper part of the ice stream, while also being in a crevasse-free area for safe surface operations. Annual cycles were observed for insoluble dust, sodium and ammonium concentrations and for electrolytic conductivity, allowing a seasonally resolved chronology covering the past 400 yr. Annual layer thicknesses averaged 0.11 m ice equivalent (i.e.) for the period 1607-2011, although accumulation varied between 0.08 and 0.14 m i.e., likely due to flow-related changes in surface topography. Tracing of RES layers from the NGRIP ice core site shows that the ice at NEGIS preserves a climatic record of at least the past 51 kyr. We demonstrate that a deep ice core drilling in this location can provide a reliable Holocene and late-glacial climate record, as well as helping to constrain the past dynamics and ice-lithosphere interactions of the Greenland Ice Sheet.

  3. Subsurface Organics in Aseptic Cores From the MARTE Robotic Drilling Experiment: Ground truth and Contamination Issues

    NASA Astrophysics Data System (ADS)

    Bonaccorsi, R.; Stoker, C. R.

    2006-12-01

    The subsurface is the key environment for searching for life on planets lacking surface life. This includes the search for past/present life on Mars where possible subsurface life could exist [1]. The Mars-Analog-Rio-Tinto-Experiment (MARTE) performed a simulation of a Mars robotic drilling at the RT Borehole#7 Site ~6.07m, atop a massive-pyrite deposit from the Iberian Pyritic Belt. The RT site is considered an important analog of Sinus Meridiani on Mars, an ideal model analog for a subsurface Martian setting [2], and a relevant example of deep subsurface microbial community including aerobic and anaerobic chemoautotrophs [4-5]. Searching for microbes or bulk organics of biological origin in a subsurface sample from a planet is a key scientific objective of Robotic drilling missions. During the 2005 Field experiment 28 minicores were robotically handled and subsampled for life detection experiments under anti-contamination protocols. Ground truth included visual observation of cores and lab based Elemental and Isotope Ratios Mass Spectrometry analysis (EA-IRMS) of bulk organics in Hematite and Gohetite-rich gossanized tuffs, gossan and clay layers within 0-6m-depth. C-org and N-tot vary up to four orders of magnitude among the litter (~11Wt%, 0-1cm) and the mineralized (~3Wt%, 1-3cm) layers, and the first 6 m-depth (C-org=0.02-0.38Wt%). Overall, the distribution/ preservation of plant and soil-derived organics (d13C-org = 26 per mil to 24 per mil) is ten times higher (C-org=0.33Wt%) that in hematite-poor clays, or where rootlets are present, than in hematite- rich samples (C-org=<0.01Wt%). This is consistent with ATP assay (Lightning-MVP, Biocontrol) for total biomass in subsurface (Borehole#7 ~6.07m, ~avg. 153RLU) vs. surface soil samples (~1,500-81,449RLU) [5]. However, the in-situ ATP assay failed in detecting presence of roots during the in-situ life detection experiment. Furthermore, cm-sized roots were overlooked during remote observations. Finally, ATP Luminometry provided insights for potential contamination from core-handling and environmental dust loadings on cleaned/sterilized control surfaces (e.g., 6,782-36,243RLU/cm2). Cleanliness/sterility can be maintained by applying a simple sterile protocol under field conditions. Science results from this research will support future Astrobiology driven drilling mission planned on Mars. Specifically, ground truth offers relevant insights to assess strengths and limits of in-situ/remote observations vs. laboratory measurements. Results from this experiment will also aid the debate on advantages/ disadvantages of manned vs. robotic drilling missions on Mars or other planets. [1] Boston et al., 1997; [2] http://marte.arc.nasa.gov; [3] Stoker, C., et al., 2006 AbSciCon, [4] Stoker et al., submitted; [5] Bonaccorsi., et al., 2006 AbSciCon.

  4. Faulting processes in active faults - Evidences from TCDP and SAFOD drill core samples

    NASA Astrophysics Data System (ADS)

    Janssen, C.; Wirth, R.; Wenk, H.-R.; Morales, L.; Naumann, R.; Kienast, M.; Song, S.-R.; Dresen, G.

    2014-08-01

    The microstructures, mineralogy and chemistry of representative samples collected from the cores of the San Andreas Fault drill hole (SAFOD) and the Taiwan Chelungpu-Fault Drilling project (TCDP) have been studied using optical microscopy, TEM, SEM, XRD and XRF analyses. SAFOD samples provide a transect across undeformed host rock, the fault damage zone and currently active deforming zones of the San Andreas Fault. TCDP samples are retrieved from the principal slip zone (PSZ) and from the surrounding damage zone of the Chelungpu Fault. Substantial differences exist in the clay mineralogy of SAFOD and TCDP fault gouge samples. Amorphous material has been observed in SAFOD as well as TCDP samples. In line with previous publications, we propose that melt, observed in TCDP black gouge samples, was produced by seismic slip (melt origin) whereas amorphous material in SAFOD samples was formed by comminution of grains (crush origin) rather than by melting. Dauphiné twins in quartz grains of SAFOD and TCDP samples may indicate high seismic stress. The differences in the crystallographic preferred orientation of calcite between SAFOD and TCDP samples are significant. Microstructures resulting from dissolution-precipitation processes were observed in both faults but are more frequently found in SAFOD samples than in TCDP fault rocks. As already described for many other fault zones clay-gouge fabrics are quite weak in SAFOD and TCDP samples. Clay-clast aggregates (CCAs), proposed to indicate frictional heating and thermal pressurization, occur in material taken from the PSZ of the Chelungpu Fault, as well as within and outside of the SAFOD deforming zones, indicating that these microstructures were formed over a wide range of slip rates.

  5. A composite lithology log while drilling

    SciTech Connect

    Tannenbaum, E.; Sutcliffe, B.; Franks, A.

    1988-01-01

    A new method for producing a computerized composite lithology log (CLL) while drilling by integrating MWD (measurement while drilling) and surface data is described. At present, lithology logs are produced at the well site by mud loggers. They provide basic description and relative amounts of lithologies. Major difficulties are encountered in relating the cuttings to their original formations due to mixing in the drilling mud while transporting to the surface, sloughing shales, flawed sampling, etc. This results in a poor control on the stratigraphic sequence and on the depth of formation boundaries. A composite log can be produced after drilling this additional inputs such as wireline, petrography, and paleontology. This process is labor intensive and expensive. The CLL integrates three types of data (MWD mechanical, MWD geophysical, and surface cuttings) acquired during drilling, in three time stages: (1) Real Time. MWD drilling mechanical data including the rate of penetration and the downhole torque. This stage would provide bed boundaries and some inferred lithology. This would assist the driller with immediate drilling decisions and determine formation tops for coring, casing point, and correlation. (2) MWD Time. Recomputation of the above by adding MWD geophysical data (gamma-ray, resistivity, neutron-density). This stage would upgrade the lithology inference, and give higher resolution to bed boundaries, (3) Lag Time. Detailed analysis of surface cuttings to confirm the inferred lithologies. This last input results in a high-quality CLL with accurate lithologies and bed boundaries.

  6. Determination of Stress State in Deep Subsea Formation by Combination of Hydrofracturing Test and Core Analysis - A Case Study in the Integrated Ocean Drilling Program (IODP) Expedition 319

    NASA Astrophysics Data System (ADS)

    Ito, T.; Funato, A.; Ito, H.; Kinoshita, M.

    2010-12-01

    As the first expedition of the NanTroSEIZE Stage 2, IODP Expedition 319 was carried out in 2009, and a borehole was drilled to 1603.7 mbsf (meters below seafloor) from seafloor at 2054 m water depth of Site C0009 which is located in a central region of the Kumano forearc basin and the upper plate above the seismogenic and presumed locked portion of the plate boundary thrust system. The upper 700 m was cased, a 12-1/4 inch hole was drilled from 700 to 1510 mbsf and RCB core was cut from 1510 to 1539.9 mbsf. By using the Schlumberger’s Modular Dynamics Tester (MDT) dual packer tool, the hydraulic fracturing (HF) test was carried out to measure in-situ stress at depth of 1532.7 mbsf in the open-hole section. While the HF test provided limited information on stress state, we finally figured out all three principal in-situ stresses and their orientations combining information obtained by other geophysical logging and the analysis of a core sample. The pressure - time curve obtained by the HF test was not typical shape, but we found a small sign of fracture initiation in pressure variation with fluid injection. Then we detected the possible shut-in pressure Ps to be 41.6 MPa. The value of Ps is obviously smaller than the vertical stress computed from the overlying strata, which is 51.8 MPa. This fact suggests that a vertical fracture was induced by the fracturing test, and so Ps should indicate the minimum horizontal stress Sh, i.e. Sh = 41.6 MPa. On the other hand, the reopening pressure Pr of a induced vertical fracture has been applied for estimating the maximum horizontal stress SH. However, for effective measurement of Pr, it is necessary to use the fracturing system with sufficiently small compliance (Ito et al., 1999; 2005; 2006). If not, there is no way to estimate the maximum horizontal stress from Pr. This limitation makes it difficult to apply hydraulic fracturing for the measurement of the maximum horizontal stress, because the compliance of the current fracturing system is generally so large. The present fracturing test was probably influenced by the problem. Thus we applied the core deformation method (Funato and Chen, 2005) for estimating SH. This method assumes that a core sample expands elastically in response to the stress release due to coring. The core sample retrieved from anisotropic in-situ stress field should expand elliptically, the maximum expansion occurs in the direction of SH, and then we can estimate the stress deviation (SH - Sh) from the difference of the major and minor axes of the elliptical core. The core sample retrieved from the depth of 1540 mbsf in the borehole drilled at site C0009 was found to be actually elliptical in shape, and from the measured dimensions of the core sample, the stress deviation (SH - Sh) was estimated to be 8.9 MPa. As a result, the remaining stress component of SH was finally estimated to be 50.5 MPa (=Ps + 8.9 MPa). The orientation of SH was estimated to be N40degW from breakout orientation detected by FMI logging.

  7. Borehole logging at the COSC-1 drill hole: a new dataset of in-situ geophysical properties through the lower Seve Nappe Complex

    NASA Astrophysics Data System (ADS)

    Berthet, Théo; Alm, Per-Gunnar; Wenning, Quinn; Almqvist, Bjarne; Kück, Jochem; Hedin, Peter

    2015-04-01

    The Collisional Orogeny in the Scandinavian Caledonides (COSC) drilling project supported by the International Continental Drilling Program was designed to study mountain building processes in a deeply eroded Paleozoic orogen. The first half of this project, COSC-1, targeted the lower part of the high grade Seve Nappe Complex and its basal thrust zone near Åre in the Jämtland county, Sweden. From May to August 2014, the COSC drilling crew drilled to a depth of 2496 m from the surface with an almost fully recovered core sample. During this drilling period, four borehole-logging runs have been conducted by Lund University with a low impact on drilling schedule and two supplementary ones once the drilling was completed. Three-Arm Caliper, Electrical Logging, Sidewall Density, Flowing Fluid Electric Conductivity, High Resolution Acoustic Televiewer and Full Waveform Sonic sondes have been used to investigate in-situ physical properties of the borehole. In addition, the ICDP operational support group has conducted two continuous borehole-logging runs from the surface to the bottom of the COSC-1 borehole in September and October. Due to technical problems, some of the planned logging have not been completed, however natural gamma, rock resistivity, magnetic susceptibility, K/Th/U concentration, temperature and fluid conductivity have been measured all along the borehole. We used the continuous natural gamma log from the ICDP logging group as the depth reference to depth-match and stack the composite borehole logging done during the drilling. These borehole logging operations result in reliable continuous data of resistivity, density, velocity, magnetic susceptibility, K/Th/U concentration, temperature, fluid conductivity, pressure, diameter as well as an image (amplitude and travel time of reflected ultrasounds) of the borehole till its bottom. Only the density, velocity and image datasets stop at 1600 m depth due to instrumentation limits. Preliminary conclusions from the borehole logging data show a stripped pattern of density correlated with velocity, which underlines the varying composition of the gneisses observed in the first 1600 m core. Pressure and temperature condition at the bottom of the borehole reach almost reach 55°C and 25 MPa. Moreover, some of the fracture zones observed in the borehole image provided by the acoustic televiewer seem to be associated with hydraulic active zones detected by spikes in the fluid conductivity logs and can also be correlated to those seen in the drill core.

  8. Results of NanTroSEIZE Expeditions Stages 1 & 2: Deep-sea Coring Operations on-board the Deep-sea Drilling Vessel Chikyu and Development of Coring Equipment for Stage 3

    NASA Astrophysics Data System (ADS)

    Shinmoto, Y.; Wada, K.; Miyazaki, E.; Sanada, Y.; Sawada, I.; Yamao, M.

    2010-12-01

    The Nankai-Trough Seismogenic Zone Experiment (NanTroSEIZE) has carried out several drilling expeditions in the Kumano Basin off the Kii-Peninsula of Japan with the deep-sea scientific drilling vessel Chikyu. Core sampling runs were carried out during the expeditions using an advanced multiple wireline coring system which can continuously core into sections of undersea formations. The core recovery rate with the Rotary Core Barrel (RCB) system was rather low as compared with other methods such as the Hydraulic Piston Coring System (HPCS) and Extended Shoe Coring System (ESCS). Drilling conditions such as hole collapse and sea conditions such as high ship-heave motions need to be analyzed along with differences in lithology, formation hardness, water depth and coring depth in order to develop coring tools, such as the core barrel or core bit, that will yield the highest core recovery and quality. The core bit is especially important in good recovery of high quality cores, however, the PDC cutters were severely damaged during the NanTroSEIZE Stages 1 & 2 expeditions due to severe drilling conditions. In the Stage 1 (riserless coring) the average core recovery was rather low at 38 % with the RCB and many difficulties such as borehole collapse, stick-slip and stuck pipe occurred, causing the damage of several of the PDC cutters. In Stage 2, a new design for the core bit was deployed and core recovery was improved at 67 % for the riserless system and 85 % with the riser. However, due to harsh drilling conditions, the PDC core bit and all of the PDC cutters were completely worn down. Another original core bit was also deployed, however, core recovery performance was low even for plate boundary core samples. This study aims to identify the influence of the RCB system specifically on the recovery rates at each of the holes drilled in the NanTroSEIZE coring expeditions. The drilling parameters such as weight-on-bit, torque, rotary speed and flow rate, etc., were analyzed and conditions such as formation, tools, and sea conditions which directly affect core recovery have been categorized. Also discussed will be the further development of such coring equipment as the core bit and core barrel for the NanTroSEIZE Stage 3 expeditions, which aim to reach a depth of 7000 m-below the sea floor into harder formations under extreme drilling conditions.

  9. Development of a portable x-ray computed tomographic imaging system for drill-site investigation of recovered core

    SciTech Connect

    Freifeld, Barry M.; Kneafsey, Timothy J.; Tomutsa, Liviu; Pruess, Jacob

    2003-05-01

    A portable x-ray computed tomography (CT) system was constructed for imaging core at drill sites. Performing drill-site-based x-ray scanning and CT analysis permits rapid evaluation of core properties (such as density, lithologic structure, and macroporosity distribution) and allows for real-time decision making for additional core-handling procedures. Because of the speed with which scanning is performed, systematic imaging and electronic cataloging of all retrieved core is feasible. Innovations (such as a novel clamshell shielding arrangement integrated with system interlocks) permit safe operation of the x-ray system in a busy core handling area. The minimization of the volume encapsulated with shielding reduces the overall system weight and facilitates instrument portability. The x-ray system as originally fabricated had a 110 kV x-ray source with a fixed 300-micron focal spot size. A 15 cm image intensifier with a cesium iodide phosphor input screen was coupled to a CCD for image capture. The CT system has since been modified with a 130 kV micro-focal x-ray source. With the x-ray system's variable focal spot size, high-resolution studies (10-micron resolution) can be performed on core plugs and coarser (100-micron resolution) images can be acquired of whole drill cores. The development of an aluminum compensator has significantly improved the dynamic range and accuracy of the system. An x-ray filter has also been incorporated, permitting rapid acquisition of multi-energy scans for more quantitative analysis of sample mineralogy. The x-ray CT system has operated reliably under extreme field conditions, which have varied from shipboard to arctic.

  10. Lithological Conditions at the Box Canyon Site: Results of Drilling, Coring and Open Borehole Measurements 1995-1997 Data Report

    SciTech Connect

    Burgess, D.; Faybishenko, B.; Holland, P.; Knutson, C.; Mesa, M.; Sisson, B.

    1998-09-01

    DOE faces the remediation of several contaminated sites in unsaturated fractured basalt where organic and radioactive wastes have migrated downward through fracture pathways that are difficult, if not impossible, to detect. Perched water zones located above zones of low permeability (massive basalt) create a complicated system of hydraulic baffles. Because of these large scale heterogeneities, the characterization of the lithology of the rock and the geometry of the subsurface fracture pattern is a crucial step in the development of a conceptual model of fluid flow and chemical transport, and eventually the design of a remediation system. The purpose of this data report is to compile and document the results of drilling and lithological studies conducted in open boreholes at the Box Canyon site. Lithological templates are included for each well and contain data such as drilling date, drilling method, logging method, well coordinates, Lithological log, gamma measurements, caliper measurements, core run and recovery depth, vesicular intervals, single fracture depths and descriptions, fracture zone depth and descriptions, and general comments about the borehole lithology. The lithological features were mapped for each borehole. The gamma and caliper measurements are presented as separate plots using greater resolution. Color core photos and core descriptions are also included. TV logging was used to map the lithology of the boreholes that were not cored (E, R, and T wells). This information will be further used to create a comprehensive lithological model of the subsurface. The TV logging of cored wells was viewed to compare the resolution and accuracy of TV logging to core logging. The TV logging method accurately showed large scale features such as zones of vesicularity, large fractures, fracture zones, rubble zones, and massive basalt zones, but it was difficult to detect hairline fractures, fracture orientation, and mineralization of fractures. Also, all depth measurements in increments less than 1 ft are estimated. TV logging is not as precise as logging directly from the core, but it is useful for mapping the major lithological features.

  11. The 40Ar\\/39Ar dating of core recovered by the Hawaii Scientific Drilling Project (phase 2), Hilo, Hawaii

    Microsoft Academic Search

    Warren D. Sharp; Paul R. Renne

    2005-01-01

    The Hawaii Scientific Drilling Project, phase 2 (HSDP-2), recovered core from a ?3.1-km-thick section through the eastern flanks of Mauna Loa and Mauna Kea volcanoes. We report results of 40Ar\\/39Ar incremental heating by broad-beam infrared laser of 16 basaltic groundmass samples and 1 plagioclase separate, mostly from K-poor tholeiites. The tholeiites generally have mean radiogenic 40Ar enrichments of 1–3%, and

  12. Lithostratigraphic and petrographic analysis of ICDP drill core LB-07A, Bosumtwi impact structure, Ghana

    NASA Astrophysics Data System (ADS)

    Coney, Louise; Gibson, Roger L.; Reimold, Wolf Uwe; Koeberl, Christian

    Lithostratigraphic and petrographic studies of drill core samples from the 545.08 m deep International Continental Scientific Drilling Program (ICDP) borehole LB-07A in the Bosumtwi impact structure revealed two sequences of impactites below the post-impact crater sediments and above coherent basement rock. The upper impactites (333.38-415.67 m depth) comprise an alternating sequence of suevite and lithic impact breccias. The lower impactite sequence (415.67-470.55 m depth) consists essentially of monomict impact breccia formed from meta-graywacke with minor shale, as well as two narrow injections of suevite, which differ from the suevites of the upper impactites in color and intensity of shock metamorphism of the clasts. The basement rock (470.55-545.08 m depth) is composed of lower greenschist-facies metapelites (shale, schist and minor phyllite), meta-graywacke, and minor meta-sandstone, as well as interlaminated quartzite and calcite layers. The basement also contains a number of suevite dikelets that are interpreted as injection veins, as well as a single occurrence of granophyric-textured rock, tentatively interpreted as a hydrothermally altered granitic intrusion likely related to the regional pre-impact granitoid complexes. Impact melt fragments are not as prevalent in LB-07A suevite as in the fallout suevite facies around the northern crater rim; on average, 3.6 vol% of melt fragments is seen in the upper suevites and up to 18 vol% in the lower suevite occurrences. Shock deformation features observed in the suevites and polymict lithic breccias include planar deformation features in quartz (1 to 3 sets), rare diaplectic quartz glass, and very rare diaplectic feldspar glass. Notably, no ballen quartz, which is abundant in the fallout suevites, has been found in the within-crater impact breccias. An overall slight increase in the degree of shock metamorphism occurs with depth in the impactites, but considerably lower shock degrees are seen in the suevites of the basement rocks, which show similar features to each other. The bulk of the suevite in LB-07A appears to have been derived from the <35 GPa shock zone of the transient crater.

  13. A composite lithology log while drilling

    SciTech Connect

    Tannenbaum, E.; Sutcliffe, B.; Franks, A.

    1988-02-01

    A new method for producing a computerized composite lithology log (CLL) while drilling by integrating MWD (measurement while drilling) and surface data is described. The CLL integrates three types of data (MWD mechanical, MWD geophysical, and surface cuttings) acquired during drilling, in three time stages: (1) Real Time. MWD drilling mechanical data including the rate of penetration and the downhole torque. This stage would provide bed boundaries and some inferred lithology. This would assist the driller with immediate drilling decisions and determine formation tops for coring, casing point, and correlation. (2) MWD Time. Recomputation of the above by adding MWD geophysical data (gamma-ray, resistivity, neutron-density). This stage would upgrade the lithology inference, and give higher resolution of bed boundaries. (3) Lag Time. Detailed analysis of surface cuttings to confirm the inferred lithologies. This last input will result in a high-quality CLL with accurate lithologies and bed boundaries. The log will serve the geologist as well as the driller, petrophysicist, and reservoir engineer. It will form the basis for more comprehensive formation evaluation while drilling by adding hydrocarbon and MWD log data.

  14. Preliminary report on the geology and geophysics of drill hole UE25a-1, Yucca Mountain, Nevada Test Site

    Microsoft Academic Search

    R. W. Spengler; D. C. Muller; R. B. Livermore

    1979-01-01

    A subsurface geologic study in connection with the Nevada Nuclear Waste Storage Investigations has furnished detailed stratigraphic and structural information about tuffs underlying northeastern Yucca Mountain on the Nevada Test Site. Drill hole UE25a-1 penetrated thick sequences of nonwelded to densely welded ash-flow and bedded tuffs of Tertiary age. Stratigraphic units that were identified from the drill-hole data include the

  15. Uranium-series age determination of calcite veins, VC-1 drill core, Valles Caldera, New Mexico

    NASA Astrophysics Data System (ADS)

    Sturchio, Neil C.; Binz, Carl M.

    1988-06-01

    Uranium-series analysis (238U-234U-230Th) of 13 calcite veins from the hydrothermally altered Madera Limestone in the VC-1 drill core was performed to determine the ages of the veins and their relation to the Valles hydrothermal system. Thermal water from VC-1 and two hot springs in San Diego Canyon was analyzed for U and (234U/238U) to help evaluate the constancy of initial (234U/238U). The (230Th/234U) age of one of the veins is ˜95 kyr, and those of two other veins are ˜230 and ˜250 kyr. Five of the veins have near equilibrium (230Th/234U) and are probably older than ˜0.3 m.y. Uranium concentrations in the remaining veins are too low for analysis by the ?-spectrometry techniques employed in this study. Of the five veins near (230Th/234U) equilibrium, four are also near (234U/238U) equilibrium, suggesting ages greater than ˜1.0 m.y., but one has (234U/238U) = 1.15, suggesting an age between ˜0.3 and ˜1.0 m.y. Calculated initial (234U/238U) of the veins yielding relatively young ages are neither equal to each other nor to (234U/238U) in thermal water from VC-1, indicating inconstancy of initial (234U/238U) that may be related to variations in groundwater mixing proportions. Three of the four veins that yield relatively young ages consist of coarse, sparry, vuggy calcite, suggesting that this may be the type of calcite vein which forms under conditions resembling those encountered presently in VC-1. The analytical data are consistent with closed-system behavior of U and Th in the VC-1 calcite veins.

  16. Neogene deformation in the West Antarctic Rift in the McMurdo Sound region from studies of the ANDRILL and Cape Roberts drill cores

    NASA Astrophysics Data System (ADS)

    Paulsen, T. S.; Wilson, T. J.; Jarrard, R. D.; Millan, C.; Saddler, D.; Läufer, A.; Pierdominici, S.

    2010-12-01

    Seismic studies indicate that the West Antarctic rift system records at least two distinct periods of Cenozoic rifting (Paleogene and Neogene) within the western Ross Sea. Natural fracture data from ANDRILL and Cape Roberts drill cores are revealing a picture of the geodynamic patterns associated with these rifting episodes. Kinematic indicators along faults recovered in drill cores document dominant normal faulting, although reverse and strike-slip faults are also present. Ongoing studies of mechanically twinned calcite in veins recovered in the drill cores yield predominantly vertical shortening strains with horizontal extension, consistent with a normal fault regime. In the Cape Roberts Project drill core, faults of inferred Oligocene age document a dominant NNE maximum horizontal stress associated with Paleogene rifting within the Victoria Land Basin. The NNE maximum horizontal stress at Cape Roberts is at an oblique angle to Transantarctic Mountain front, and consistent with previous interpretations invoking Cenozoic dextral transtensional shear along the boundary. In the ANDRILL SMS (AND-2A) drill core, faults and veins presumably associated with Neogene rifting document a dominant NNW to NE faulting of an expanded Lower Miocene section, although subsidiary WNW faulting is also present within the upper sections of oriented core. In the ANDRILL MIS (AND-1B) drill core, natural fractures are consistently present through the core below c. 450 mbsf, the estimated depth of the ‘B-clino’ seismic reflector. This is consistent with the presence of seismically-detectable faults below this horizon, which record the major faulting episode associated with Neogene rifting in the Terror Rift. Sedimentary intrusions and steep veins folded by compaction indicate that deformation occurred prior to complete lithification of the strata, suggesting that deformation was at least in part coeval with deposition. Faults and associated veins intersected in the AND-1B drill core also cut Pliocene and Pleistocene strata, suggesting that deformation has continued to the recent or may perhaps ongoing.

  17. ESTIMATING UNCERTAINTIES FOR GEOPHYSICAL

    E-print Network

    Kreinovich, Vladik

    to directly measure the amount of oil in an area is to drill several wells, but drilling is a very expensive procedure, and the whole idea of geophysics is to predict the amount of oil without drilling in all possible are: to locate minerals (oil, gas, fresh and saline water, etc); to locate and predict earthquakes

  18. Results of core drilling in the Mahogany Zone and some adjacent beds of the Green River formation, Winter Ridge area, Southeastern Uinta basin, Utah

    SciTech Connect

    Cashion, W.B.

    1981-01-01

    The area discussed is in the S.-Central Uintah County and N.-Central Grand County, Utah. Seven shallow core holes were drilled in the area to evaluate the oil-shale beds of the Mahogany Zone and to determine the approximate position of the 15-ft isopach for the oil-shale sequence with an average yield of 15 gal of shale oil per ton. Sandstone beds immediately above and below the Mahogany Zone also were cored in order to sample those beds that contain bitumen. The cores were examined and described and cores from sequences containing appreciable amounts of kerogen or bitumen were assayed by the Fischer retort method. The core drilling was done by Wildcat Drilling Service, Inc. of Montrose, Colo., and the assaying was done by the Colorado School of Mines Research Institute, Golden, Colo.

  19. 7. SOUTHEAST PACIFIC OCEAN TRANSECT, TAHITI TO PANAMA: GEOPHYSICAL PROFILES FROM DEEP SEA DRILLING PROJECT LEG 921

    Microsoft Academic Search

    David K. Rea

    The Glomar Challenger left Tahiti in February of 1983, sailed 4621 mi. during Leg 92, and anchored in Panama 2 mo. later. During the cruise, geophysical profiles were acquired across the Society and Tuamotu seamount chains, the East Pacific Rise, the Bauer Basin, the Carnegie Platform and Ridge, and the Panama Basin.

  20. Initial results from VC-1, First Continental Scientific Drilling Program Core Hole in Valles Caldera, New Mexico

    NASA Astrophysics Data System (ADS)

    Goff, Fraser; Rowley, John; Gardner, Jamie N.; Hawkins, Ward; Goff, Sue; Charles, Robert; Wachs, Daniel; Maassen, Larry; Heiken, Grant

    1986-02-01

    Valles Caldera 1 (VC-1) is the first Continental Scientific Drilling Program (CSDP) core hole drilled in the Valles caldera and the first continuously cored well in the caldera region. The objectives of VC-1 were to penetrate a hydrothermal outflow plume near its source, to obtain structural and stratigraphie information near the intersection of the ring fracture zone and the precaldera Jemez fault zone, arid to core the youngest volcanic unit inside the caldera (Banco Bonito obsidian). Coring of the 856-m well took only 35 days to finish, during which all objectives were attained and core recovery exceeded 95%. VC-1 penetrates 298 m of moat volcanics and caldera fill ignimbrites, 35 m of precaldera volcaniclastic breccia, and 523 m of Paleozoic carbonates, sandstones, and shales. A previously unknown obsidian flow was encountered at 160 m depth underlying the Battleship Rock Tuff in the caldera moat zone. Hydrothermal alteration is concentrated in sheared, brecciated, and fractured zones from the volcaniclastic breccia to total depth with both the intensity and rank of alterations increasing with depth. Alteration assemblages consist primarily of clays, calcite, pyrite, quartz, and chlorite, but chalcopyrite and sphalerite have been identified as high as 450 m and molybdenite has been identified in a fractured zone at 847 m. Carbon 13 and oxygen 18 analyses of core show that the most intense zones of hydrothermal alteration occur in the Madera Limestone above 550 m and in the Madera and Sandia formations below 700 m. This corresponds with zones of most intense calcite and quartz veining. Thermal aquifers were penetrated at the 480-, 540-, and 845-m intervals. Although these intervals are associated with alteration, brecciation, and veining, they are also intervals where clastic layers occur in the Paleozoic sedimentary rocks.

  1. Initial results from VC-1, first Continental Scientific Drilling Program core hole in Valles caldera, New Mexico

    SciTech Connect

    Goff, F.; Rowley, J.; Gardner, J.N.; Hawkins, W.; Goff, S.; Charles, R.; Wachs, D.; Maassen, L.; Heiken, G.

    1986-02-10

    Valles Caldera 1 (VC-1) is the first Continental Scientific Drilling Program (CSDP) core hole drilled in the Valles caldera and the first continuously cored well in the caldera region. The objectives of VC-1 were to penetrate a hydrothermal outflow plume near its source, to obtain structural and stratigraphic information near the intersection of the ring fracture zone and the precaldera Jemez fault zone, and to core the youngest volcanic unit inside the caldera (Banco Bonito obsidian). Coring of the 856-m well took only 35 days to finish, during which all objectives were attained and core recovery exceeded 95%. VC-1 penetrates 298 m of moat volcanics and caldera fill ignimbrites, 35 m of precaldera volcaniclastic breccia, and 523 m of Paleozoic carbonates, sandstones, and shales. A previously unknown obsidian flow was encountered at 160 m depth underlying the battleship Rock Tuff in the caldera moat zone. Hydrothermal alteration is concentrated in sheared, brecciated, and fractured zones from the volcaniclastic breccia to total depth with both the intensity and rank of alterations increasing with depth. Alteration assemblages consist primarily of clays, calcite, pyrite, quartz, and chlorite, but chalcopyrite and sphalerite have been identified as high as 450 m and molybdenite has been identified in a fractured zone at 847 m. Carbon 13 and oxygen 18 analyses of core show that the most intense zones of hydrothermal alteration occur in the Madera Limestone above 550 m and in the Madera and Sandia formations below 700 m. This corresponds with zones of most intense calcite and quartz veining. Thermal aquifers were penetrated at the 480-, 540-, and 845-m intervals. Although these intervals are associated with alteration, brecciation, and veining, they are also intervals where clastic layers occur in the Paleozoic sedimentary rocks.

  2. Laboratory-Determined Transport Properties of Core From the Salton Sea Scientific Drilling Project

    NASA Astrophysics Data System (ADS)

    Lin, Wunan; Daily, William

    1988-11-01

    Two cores from the Salton Sea Scientific Drilling Project have been studied in the laboratory to determine electrical resistivity, ultrasonic velocity, and brine permeability at pressures and temperatures close to estimated borehole conditions. Both samples were siltstones; the first sample was from 1158-m depth, and the other was from 919-m depth. A synthetic brine with 13.6 weight percent NaCl, 7.5 weight percent CaCl2, and 3.2 weight percent KCl was used as a pore fluid. The dry bulk density of the first sample was 2.44 Mg m-3 with an effective porosity of 8.7%. The second sample had a dry bulk density of 2.06 Mg m-3 with an effective porosity of 22.2%. At the midplane of the first sample, electrical impedance tomography was used to map the spatial variation of resistivity during the experiment. Also, at the midplane of both samples, ultrasonic tomography was used to map the spatial variation of P wave velocity. In addition, resistivity was measured with six pairs of electrodes along the sample axis. Both samples showed a strong anisotropy in resistivity and ultrasonic velocity measured perpendicular and parallel to the sample axis. The brine permeability of the first sample decreased from 5 ?D to about 1.6 ?D during the experiment. The second sample permeability had the same trend, but the permeability values were about 3 orders of magnitude larger. The second sample was subjected to temperatures and pressures exceeding those experienced in situ. Permeability, resistivity, and ultrasonic velocity of this sample showed a discontinuous change just beyond these in situ conditions. This discontinuity implies a structural change in the rock under conditions which would be found below its origin depth in the borehole. A model is proposed to explain the observed velocity anisotropy and variations in velocity, electrical resistivity anisotropy, and permeability with effective depth. When in situ stress is released, microcracking may occur along grain boundaries preferentially oriented parallel to bedding. This microcracking controls velocity and resistivity anisotropy at room conditions. When pressure and temperature are restored, competing effects of compaction and thermal softening of the minerals cause a reversal in the anisotropy. At temperatures and pressures above those at in situ conditions, thermal fracturing or geochemical alteration along grain boundaries causes a discontinuous change in sample physical properties.

  3. The Last Interglacial in the Levant: Perspective from the ICDP Dead Sea Deep Drill Core

    NASA Astrophysics Data System (ADS)

    Goldstein, S. L.; Torfstein, A.; Stein, M.; Kushnir, Y.; Enzel, Y.; Haug, G. H.

    2014-12-01

    Sediments recovered by the ICDP Dead Sea Deep Drilling Project provide a new perspective on the climate history of the Levant during the last interglacial period MIS5. They record the extreme impacts of an intense interglacial characterized by stronger insolation, warmer mean global temperatures, and higher sea-levels than the Holocene. Results show both extreme hyper-aridity during MIS5e, including an unprecedented drawdown of Dead Sea water levels, and the impacts of a strong precession-driven African monsoon responsible for a major sapropel event (S5) in the eastern Mediterranean. Hyper-arid conditions at the beginning of MIS5e prior to S5 (~132-128 ka) are evidenced by halite deposition, indicating declining Dead Sea lake levels. Surprisingly, the hyper-arid phase is interrupted during the MIS5e peak (~128-120 ka), coinciding with the S5 sapropel, which is characterized by a thick (23 m) section of silty detritus (without any halite) whose provenance indicates southern-sourced wetness in the watershed. Upon weakening of the S5 monsoon (~120-115 ka), the return of extreme aridity resulted in an unprecedented lake level drawdown, reflected by massive salt deposition, and followed by a sediment hiatus (~115-100 ka) indicating prolonged low lake level. The resumption of section follows classic Levant patterns with more wetness during cooler MIS5b and hyper-aridity during warmer MIS5a. The ICDP core provides the first evidence for a direct linkage between an intense precession-driven African monsoon and wetness at the high subtropical latitude (~30N) of the Dead Sea watershed. Combined with coeval deposition of Negev speleothems and travertines, and calcitification of Red Sea corals, the evidence indicates a wet climatic corridor that could facilitate homo sapiens migration out of Africa during the MIS5e peak. In addition, the MIS 5e hyper-arid intervals may provide an important cautionary analogue for the impact of future warming on regional water resources.

  4. Online drilling mud gas monitoring and sampling during drilling the Scandinavian Caledonides (COSC)

    NASA Astrophysics Data System (ADS)

    Wiersberg, Thomas; Almqvist, Bjarne; Klonowska, Iwona; Lorenz, Henning

    2015-04-01

    The COSC project (Collisional Orogeny in the Scandinavian Caledonides) drilled a 2496 m deep hole in Åre (Sweden) to deliver insights into mid-Palaeozoic mountain building processes from continent-continent collision, to improve our understanding of the hydrogeological-hydrochemical state and geothermal gradient of the mountain belt and to study the deep biosphere in the metamorphic rocks and crystalline basement. COSC was the first slimhole drilling project where online gasmonitoring of drilling mud was conducted during continuous wireline coring. Gas was continuously extracted at the surface from the circulating drilling mud with a gas-water separator, pumped in a nearby laboratory container and analysed in real-time with a quadrupole mass spectrometer for argon, methane, helium, carbon dioxide, nitrogen, oxygen, hydrogen, and krypton. Gas samples were taken from the gas line for laboratory studies on chemical composition of hydrocarbons, noble gas isotopes and stable isotopes. Every drill core created a gas peak identified in the drilling mud ~20-30 min after core arrival at the surface. With known core depth and surface arrival time, these gas peaks could be attributed to depth. As a result, nearly complete gas depth profiles at three meter intervals were obtained from 662 m (installation of the gas-water separator) to 2490 m depth. Maximum concentrations of non-atmospheric gasses in drilling mud were ~200 ppmv helium, ~300 ppmv methane and ~2 vol-% hydrogen. Helium peaks between ~900 m and 1000 m and correlates with enhanced concentrations of methane. Methane and hydrogen exhibit maximum concentrations below 1630 m depth where helium concentrations remain low. Integration of the drilling mud gas monitoring dataset with data from geophysical downhole logging and core analysis is ongoing to help clarifying provenances and origin of gasses.

  5. Geology, drilling, and some hydrologic aspects of seismic hazards program core holes, Los Alamos National Laboratory, New Mexico

    SciTech Connect

    Gardner, J.N. (Los Alamos National Lab., NM (United States)); Kolbe, T.; Chang, S. (Woodward-Clyde Consultants, Oakland, CA (United States))

    1993-01-01

    As part of the Los Alamos National Laboratory's Seismic Hazards Investigations Program, we have cored four holes, as follows: SHB-I at TA-55 to 700 feet; SHB-2 at TA-3 to 200 feet; SHB-3 at TA-16 to 860 feet; and, SHB-4 at TA-18 to 200 feet. In that the near-surface seismic velocity structure of the holes is the subject of other reports, we describe here the lithologies, general aspects of drilling, and some hydrologic implications of the core holes. All four holes penetrated variably welded Tshirege Member of the Bandelier Tuff. Beneath two deeper holes encountered thick sequences of epiclastic sands and gravels, with minor interbeds of Cerro Toledo Rhyolite, on top of the dominantly nonwelded Otowi Member of the Bandelier Tuff. Beneath the Otowi was basalt at TA-55 and Puye Formation sands and gravels at TA-16. Two of the core holes (SHB-3 at TA-16 and SHB-4 at TA-18) appear to have encountered groundwater. The holes were all continuously cored with conventional wireline diamond coring techniques. Maintaining high percentage core recovery in nonwelded tuff and loose formations with air as the circulating fluid proved impossible. Light muds, however, improved recovery in these zones considerably. A variety of bits were tested, but none yielded consistent results in the alternating hard and soft rock conditions found beneath the Laboratory.

  6. Geology, drilling, and some hydrologic aspects of seismic hazards program core holes, Los Alamos National Laboratory, New Mexico

    SciTech Connect

    Gardner, J.N. [Los Alamos National Lab., NM (United States); Kolbe, T.; Chang, S. [Woodward-Clyde Consultants, Oakland, CA (United States)

    1993-01-01

    As part of the Los Alamos National Laboratory`s Seismic Hazards Investigations Program, we have cored four holes, as follows: SHB-I at TA-55 to 700 feet; SHB-2 at TA-3 to 200 feet; SHB-3 at TA-16 to 860 feet; and, SHB-4 at TA-18 to 200 feet. In that the near-surface seismic velocity structure of the holes is the subject of other reports, we describe here the lithologies, general aspects of drilling, and some hydrologic implications of the core holes. All four holes penetrated variably welded Tshirege Member of the Bandelier Tuff. Beneath two deeper holes encountered thick sequences of epiclastic sands and gravels, with minor interbeds of Cerro Toledo Rhyolite, on top of the dominantly nonwelded Otowi Member of the Bandelier Tuff. Beneath the Otowi was basalt at TA-55 and Puye Formation sands and gravels at TA-16. Two of the core holes (SHB-3 at TA-16 and SHB-4 at TA-18) appear to have encountered groundwater. The holes were all continuously cored with conventional wireline diamond coring techniques. Maintaining high percentage core recovery in nonwelded tuff and loose formations with air as the circulating fluid proved impossible. Light muds, however, improved recovery in these zones considerably. A variety of bits were tested, but none yielded consistent results in the alternating hard and soft rock conditions found beneath the Laboratory.

  7. Ice cores drilled from lake and ocean floors, continents, and ice sheets provide geoscientists with the most extensive and accurate picture of the earth!s

    E-print Network

    Johnson, Andrew

    zer Ice cores drilled from lake and ocean floors, continents, and ice sheets provide geoscientists with the most extensive and accurate picture of the earth!s climate history. For decades, these stratigraphic records have been locked in core repositories around the world. Now, aided by modern information

  8. Trace-element analyses of core samples from the 1967-1988 drillings of Kilauea Iki lava lake, Hawaii

    USGS Publications Warehouse

    Helz, Rosalind Tuthill

    2012-01-01

    This report presents previously unpublished analyses of trace elements in drill core samples from Kilauea Iki lava lake and from the 1959 eruption that fed the lava lake. The two types of data presented were obtained by instrumental neutron-activation analysis (INAA) and energy-dispersive X-ray fluorescence analysis (EDXRF). The analyses were performed in U.S. Geological Survey (USGS) laboratories from 1989 to 1994. This report contains 93 INAA analyses on 84 samples and 68 EDXRF analyses on 68 samples. The purpose of the study was to document trace-element variation during chemical differentiation, especially during the closed-system differentiation of Kilauea Iki lava lake.

  9. Whole-rock analyses of core samples from the 1988 drilling of Kilauea Iki lava lake, Hawaii

    USGS Publications Warehouse

    Helz, Rosalind Tuthill; Taggart, Joseph E., Jr.

    2010-01-01

    This report presents and evaluates 64 major-element analyses of previously unanalyzed Kilauea Iki drill core, plus three samples from the 1959 and 1960 eruptions of Kilauea, obtained by X-ray fluorescence (XRF) analysis during the period 1992 to 1995. All earlier major-element analyses of Kilauea Iki core, obtained by classical (gravimetric) analysis, were reported and evaluated in Helz and others (1994). In order to assess how well the newer data compare with this earlier suite of analyses, a subset of 24 samples, which had been analyzed by classical analysis, was reanalyzed using the XRF technique; those results are presented and evaluated in this report also. The XRF analyses have not been published previously. This report also provides an overview of how the chemical variations observed in these new data fit in with the chemical zonation patterns and petrologic processes inferred in earlier studies of Kilauea Iki.

  10. Geophysical characterization of the Lollie Levee near Conway, Arkansas, using capacitively coupled resistivity, coring, and direct push logging

    USGS Publications Warehouse

    Gillip, Jonathan A.; Payne, Jason D.

    2011-01-01

    A geophysical characterization of Lollie Levee near Conway, Arkansas, was conducted in February 2011. A capacitively coupled resistivity survey (using Geometric's OhmMapper) was completed along the top and toe of the 6.7-mile levee. Two-dimensional inversions were conducted on the geophysical data. As a quality-control measure, cores and direct push logs were taken at approximately 1-mile intervals along the levee. The capacitively coupled resistivity survey, the coring, and the direct push logs were used to characterize the geologic materials. Comparison of the cores and the direct push log data, along with published resistivity values, indicates that resistivity values of 200 Ohm-meters or greater represent relatively clean sand, with decreasing resistivity values occurring with increasing silt and clay content. The cores indicated that the levee is composed of a heterogeneous mixture of sand, silt, and clay. The capacitively coupled resistivity sections confirm that the levee is composed of a heterogeneous mixture of high and low resistivity materials and show that the composition of the levee varies spatially. The geologic materials underlying the levee vary spatially as a result of the geologic processes that deposited them. In general, the naturally deposited geologic materials underlying the levee contain a greater amount of low resistivity materials in the southern extent of the levee.

  11. Preliminary results of coal exploratory drilling in the Book Cliffs coal region, Garfield County, Colorado, and Grand County, Utah

    USGS Publications Warehouse

    Gualtieri, James Louis

    1979-01-01

    Four holes were drilled in the Book Cliffs coal region of Garfield County, Colorado and Grand County, Utah to provide coal core samples suitable for analysis and stratigraphic information about coal-bearing strata. Three of the holes were completed; the fourth remains to be completed; a fifth is planned. A total of 1,693 feet (515 m) of pilot-hole rotary drilling and 843 feet (257 m) of core drilling was done. Mechanical and geophysical logs of the first, third, and fourth pilot holes were made; only the upper part of the second hole, which was almost entirely cored, was logged. Most of the cored rock is from the coal-bearing Neslen Formation and almost all of it is carbonaceous to some degree. Lithologies of the rotaried intervals are shown in the accompanying plate and were interpreted from geophysical logs and cuttings.

  12. Brines and interstitial brackish water in drill cores from the deep gulf of Mexico.

    PubMed

    Manheim, F T; Sayles, F L

    1970-10-01

    Marked increases in interstitial salinity occur in two drill holes located in the Gulf of Mexico at a water depth of more than 3500 meters. The increases probably arose through diffusion of salt from buried evaporites. In one hole, however, brackish water was encountered on penetrating the oil-permeated cap rock of a salt dome. The phenomenon is attributed to production of fresh water during oxidation of petroleum hydrocarbons and decomposition of gypsum to form native sulfur. PMID:17734668

  13. Drill core LB-08A, Bosumtwi impact structure, Ghana: Petrographic and shock metamorphic studies of material from the central uplift

    NASA Astrophysics Data System (ADS)

    Ferrière, Ludovic; Koeberl, Christian; Reimold, Wolf Uwe

    During a recent drilling project sponsored by the International Continental Scientific Drilling Progam (ICDP), two boreholes (LB-07A and LB-08A) were drilled into the crater fill of the Bosumtwi impact structure and the underlying basement, into the deep crater moat and the outer flank of the central uplift, respectively. The Bosumtwi impact structure in Ghana (West Africa), which is 10.5 km in diameter and 1.07 Myr old, is largely filled by Lake Bosumtwi. Here we present the lithostratigraphy of drill core LB-08A (recovered between 235.6 and 451.33 m depth below lake level) as well as the first mineralogical and petrographic observations of samples from this core. This drill core consists of approximately 25 m of polymict, clast-supported lithic breccia intercalated with suevite, which overlies fractured/brecciated metasediment that displays a large variation in lithology and grain size. The lithologies present in the central uplift are metasediments composed dominantly of fine-grained to gritty meta-graywacke, phyllite, and slate, as well as suevite and polymict lithic impact breccia. The suevites, principally present between 235.6 and 240.5 m and between 257.6 and 262.2 m, display a fine-grained fragmental matrix (about 39 to 45 vol%) and a variety of lithic and mineral clasts that include meta-graywacke, phyllite, slate, quartzite, carbon-rich organic shale, and calcite, as well as melt particles, fractured quartz, unshocked quartz, unshocked feldspar, quartz with planar deformation features (PDFs), diaplectic quartz glass, mica, epidote, sphene, and opaque minerals). The crater-fill suevite contains calcite clasts but no granite clasts, in contrast to suevite from outside the northern crater rim. The presence of melt particles in suevite samples from the uppermost 25 meters of the core and in suevite dikelets in the basement is an indicator of shock pressures exceeding 45 GPa. Quartz grains present in suevite and polymict lithic impact breccia abundantly display 1 to (rarely) 4 sets of PDFs per grain. The shock pressures recorded by the PDFs in quartz grains in the polymict impact breccia range from 10 to ~30 GPa. We also observed a decrease of the abundance of shocked quartz grains in the brecciated basement with increasing depth. Meta-graywacke samples from the basement are heterogeneously shocked, with shock pressures locally ranging up to 25-30 GPa. Suevites from this borehole show a lower proportion of melt particles and diaplectic quartz glass than suevites from outside the northern crater rim (fallback impact breccia), as well as a lack of ballen quartz, which is present in the external breccias. Similar variations of melt-particle abundance and shockmetamorphic grade between impact-breccia deposits within the crater and fallout impact breccia outside the crater have been observed at the Ries impact structure, Germany.

  14. New paleomagnetic results from basaltic drill cores of the Nauru Basin, Western Pacific: Tectonic and magnetostratigraphic implications

    NASA Astrophysics Data System (ADS)

    Yan, Maodu; Zhao, Xixi; Riisager, Peter

    2008-03-01

    The voluminous volcanic eruptions in the Nauru Basin, Western Pacific, have long been regarded as important research targets for tectonic history of the Pacific Plate and for the widespread Cretaceous volcanic activity in the Western Pacific. The Nauru Basin volcanic rocks were recovered at Site 462 by Deep Sea Drilling Project (DSDP) Legs 61 and 89, where more than 600 m of lavas and sills were drilled, thereby making it the deepest penetration into crust of Cretaceous age in the Pacific Ocean. For paleomagnetism, this section represents a unique possibility for averaging out secular variation to obtain a reliable paleolatitude estimate. However, previous paleomagnetic studies have only been subjected to alternating field (AF) demagnetization on several core samples, thus, unable to provide comprehensive understanding on the paleolatitude of the basin. The work reported here aims to determine the Cretaceous paleomagnetic paleolatitude for the Pacific Plate and define the magnetostratigraphy for the basaltic sections drilled in the Nauru Basin. A total of 391 basaltic rock samples were carefully re-sampled from DSDP Sites 462 and 462A. Stepwise thermal and AF demagnetizations have isolated characteristic components in the majority of the samples. The most important findings from this study include: (1) Two normal and one reversed polarity intervals are identified in Site 462, and six normal and six reversed polarity intervals are found in Site 462A, although possible erroneous markings of the opposite azimuth for some reversed polarity cores during the DSDP coring cannot be completely ruled out. (2) Based on previous radiometric ages, the magnetostratigraphic correlations with the Geomagnetic Polarity Time Scale (GPTS) indicate that the lower-basaltic flow unit in Site 462A began to erupt at least before 130 Ma. No correlation is available for the upper-sill unit. (3) Paleosecular variation for the lower-flow unit has been sufficiently averaged out; whereas bias may exist for that of the upper-sill unit; (4) The calculated mean inclination of ? - 50° for the lower-flow unit yields a paleolatitude of 30.8°S for the Nauru Basin at the time of emplacement. This value is well to the north of suggested location in plate reconstruction models, suggesting that there has been a significant amount of apparent polar wander of the Nauru Basin and Pacific plate since 130 Ma. In addition, the paleolatitude for the Nauru Basin is ? 7° further south and the basin's age is more than 10 my older than those of the Ontong Java Plateau (OJP), which suggest that the volcanic eruptions of the lower flows in the Nauru Basin are unlikely related to the emplacement of the Ontong Java Plateau.

  15. Drill core LB-08A, Bosumtwi impact structure, Ghana: Geochemistry of fallback breccia and basement samples from the central uplift

    NASA Astrophysics Data System (ADS)

    Ferrière, Ludovic; Koeberl, Christian; Reimold, Wolf Uwe; Mader, Dieter

    The 1.07 Myr old Bosumtwi impact structure in Ghana (West Africa), which measures 10.5 km in diameter and is largely filled by Lake Bosumtwi, is associated with one of four currently known tektite strewn fields. Two boreholes were drilled to acquire hard-rock samples of the deep crater moat and from the flank of the central uplift (LB-07A and LB-08A, respectively) during a recent ICDP-sponsored drilling project. Here we present results of major and trace element analysis of 112 samples from drill core LB-08A. This core, which was recovered between 235.6 and 451.33 m depth below lake level, contains polymict lithic breccia intercalated with suevite, which overlies fractured/brecciated metasediment. The basement is dominated by meta-graywacke (from fine-grained to gritty), but also includes some phyllite and slate, as well as suevite dikelets and a few units of a distinct light greenish gray, medium-grained meta-graywacke. Most of the variations of the major and trace element abundances in the different lithologies result from the initial compositional variations of the various target rock types, as well as from aqueous alteration processes, which have undeniably affected the different rocks. Suevite from core LB-08A (fallback suevite) and fallout suevite samples (from outside the northern crater rim) display some differences in major (mainly in MgO, CaO, and Na2O contents) and minor (mainly Cr and Ni) element abundances that could be related to the higher degree of alteration of fallback suevites, but also result from differences in the clast populations of the two suevite populations. For example, granite clasts are present in fallout suevite but not in fallback breccia, and calcite clasts are present in fallback breccia and not in fallout suevite. Chondrite-normalized rare earth element abundance patterns for polymict impact breccia and basement samples are very similar to each other. Siderophile element contents in the impact breccias are not significantly different from those of the metasediments, or compared to target rocks from outside the crater rim. So far, no evidence for a meteoritic component has been detected in polymict impact breccias during this study, in agreement with previous work.

  16. Detailed petrophysical and geophysical characterization of core samples from the potential caprock-reservoir system in the Sulcis Coal Basin (South-Western Sardinia - Italy).

    NASA Astrophysics Data System (ADS)

    Fais, Silvana; Ligas, Paola; Cuccuru, Francesco; Maggio, Enrico; Plaisant, Alberto; Pettinau, Alberto

    2015-04-01

    The evaluation of the CO2 geologic storage site requires a robust experimental database especially with respect to spatial petrophysical heterogeneities. The integrated analysis of minero-petrographical, physical and geophysical parameters (e.g. longitudinal and transversal propagation velocity, VpVs ratio, dynamic elastic moduli, etc.) of the rocks that make up a caprock-reservoir system can substantially reduce the geologic uncertainity in the storage site characterization and in the geological and numerical modelling for the evaluation of the CO2 storage capacity. In this study the Middle Eocene - Lower Oligocene Cixerri Formation made up of siliciclastic rocks and the Upper Thanetian - Lower Ypresian Miliolitico Carbonate Complex in the Sulcis coal basin (South-Western Sardinia - Italy) have been identified respectively as potential caprock and reservoir for the CO2 storage. The petrographical, physical and geophysical parameters of the above mentioned geological Formations (Cixerri and Milolitico) were investigated to improve the geological model aimed at verifying the geological CO2 storage capacity within the carbonate reservoir rocks, in order to guarantee an efficient use of the reservoir, and to improve the numerical simulation of CO2 behaviour in the short, medium and long term after its injection in single or multiple wells. . The petrographical characteristics of the caprock-reservoir rocks were determined by optical and SEM analyses of core samples representing the different facies of the Cixerri Formation and of the Miliolitico Carbonate Complex, provided by Carbosulcis S.p.A.. Porosity analysis was completed by mercury porosimeter determinations which also provided quantitative information on the permeability of the study rocks and on the tortuosity of their pore system. Further physical properties, such as dry and saturated density and porosity, and water absorption were determined on the cylindrical core samples of intact rocks (ISRM, 1979) from wells drilled in the northern part of the Sulcis Coal Basin (Nuraxi Figus area). The propagation velocity of longitudinal (Vp) and transversal (Vs) waves was also determined on the same samples by a portable ultrasonic non-destructive digital indicating tester (P.U.N.D.I.T. plus) (ISRM, 1978). Starting from the P and S wave velocity, the dynamic elastic moduli (Young modulus, bulk modulus and Poisson's ratio) were determined using the well-known relationship involving the longitudinal (Vp) and shear wave (Vs) velocity and the rock bulk density. The elastic properties (Vp, Vs, elastic moduli) have been correlated with physical properties such as porosity and bulk density. The analysis of the above mentioned relations reveals that the geological formations that make up the caprock-reservoir system are affected by a high spatial heterogeneity in their petrophysical properties and then in their intrinsic characteristics. The petrophysical and geophysical parameter analysis also allowed to identify different lithologic types for the caprock (e.g. litharenites, siltites) and the reservoir (e.g. limestones, dolomitic limestones, calcareous dolomites). These data enhanced the interpretation of the surface reflection seismic data on the same area helping in distinguishing separate features. Acknowledgments: We thank Carbosulcis S.p.A. for providing us the core samples and the reflection seismic data used for this study.

  17. Carbon and nitrogen isotope composition of core catcher samples from the ICDP deep drilling at Laguna Potrok Aike (Patagonia, Argentina)

    NASA Astrophysics Data System (ADS)

    Luecke, Andreas; Wissel, Holger; Mayr*, Christoph; Oehlerich, Markus; Ohlendorf, Christian; Zolitschka, Bernd; Pasado Science Team

    2010-05-01

    The ICDP project PASADO aims to develop a detailed paleoclimatic record for the southern part of the South American continent from sediments of Laguna Potrok Aike (51°58'S, 70°23'W), situated in the Patagonian steppe east of the Andean cordillera and north of the Street of Magellan. The precursor project SALSA recovered the Holocene and Late Glacial sediment infill of Laguna Potrok Aike and developed the environmental history of the semi-arid Patagonian steppe by a consequent interdisciplinary multi-proxy approach (e.g. Haberzettl et al., 2007). From September to November 2008 the ICDP deep drilling took place and successfully recovered in total 510 m of sediments from two sites resulting in a composite depth of 106 m for the selected main study Site 2. A preliminary age model places the record within the last 50.000 years. During the drilling campaign, the core catcher content of each drilled core run (3 m) was taken as separate sample to be shared and distributed between involved laboratories long before the main sampling party. A total of 70 core catcher samples describe the sediments of Site 2 and will form the base for more detailed investigations on the palaeoclimatic history of Patagonia. We here report on the organic carbon and nitrogen isotope composition of bulk sediment and plant debris of the core catcher samples. Similar investigations were performed for Holocene and Late Glacial sediments of Laguna Potrok Aike revealing insights into the organic matter dynamics of the lake and its catchment as well as into climatically induced hydrological variations with related lake level fluctuations (Mayr et al., 2009). The carbon and nitrogen content of the core catcher fine sediment fraction (<200 µm) is low to very low (around 1 % and 0.1 %, respectively) and requires particular attention in isotope analysis. The carbon isotope composition shows comparably little variation around a value of -26.0 per mil. The positive values of the Holocene and the Late Glacial (up to 22.0 per mil) are only sporadically reached down core. Compared to this, separated moss debris is remarkably 13C depleted with a minimum at 31.5 per mil. The nitrogen isotope ratios of glacial Laguna Potrok Aike sediments are lower (2.5 per mil) than those of the younger part of the record. The core catcher samples indicate several oscillations between 0.5 and 3.5 per mil. Data suggest a correlation between nitrogen isotopes and C/N ratios, but no linear relation between carbon isotopes and carbon content and an only weak relationship between carbon and nitrogen isotopes. Increasing nitrogen isotope values from 8000 cm downwards could probably be related to changed environmental conditions of Marine Isotope Stage 3 (MIS 3) compared to Marine Isotope Stage 2 (MIS 2). This will be further evaluated with higher resolution from the composite profile including a detailed study of discrete plant debris layers. References Haberzettl, T. et al. (2007). Lateglacial and Holocene wet-dry cycles in southern Patagonia: chronology, sedimentology and geochemistry of a lacustrine record from Laguna Potrok Aike, Argentina. The Holocene, 17: 297-310. Mayr, C. et al. (2009). Isotopic and geochemical fingerprints of environmental changes during the last 16,000 years on lacustrine organic matter from Laguna Potrok Aike (southern Patagonia, Argentina). Journal of Paleolimnology, 42: 81-102.

  18. Results of core drilling for uranium-bearing carbonaceous shale and lignite in the Goose Creek district, Cassia County, Idaho

    USGS Publications Warehouse

    Mapel, William J.; Hail, William J., Jr.

    1954-01-01

    Thirteen core holes, totaling 2,023 feet, were drilled during the fall of 1953 to explore the grade and extent of uranium-bearing beds of carbonaceous shale and lignite in the east-central part of the Goose Creek district, Cassia County, Idaho. The beds tested are interbedded with volcanic ash, bentonite, greenish-gray shale, sandstone, and conglomerate in two fairly well defined zones in the lower part of the Salt Lake formation of lower Pliocene age. Nine holes penetrated carbonaceous shale beds in the Barrett zone, and one hole penetrated carbonaceous shale and lignite beds in zone B, 160 feet stratigraphically below the Barrett zone. The highest concentration of uranium found by drilling is 0.10 percent in the upper part of a 4-foot bed of carbonaceous shale and lignite in zone B. The grade of carbonaceous shale beds in the Barrett zone ranges from 0.044 percent to less than 0.003 percent uranium. Inferred reserves in the district are estimated to be 790,000 tons in beds 1 foot or more thick containing an average of 0.014 percent or 120 tons of uranium.

  19. Description and hydrogeologic implications of cored sedimentary material from the 1975 drilling program at the radioactive waste management complex, Idaho

    USGS Publications Warehouse

    Rightmire, C.T.

    1984-01-01

    Samples of sedimentary material from interbeds between basalt flows and from fractures in the flows, taken from two drill cores at the Radioactive Waste Management Complex at the Idaho National Engineering Laboratory were analyzed for (1) particle-size dribution, (2) bulk mineralogy, (3) clay mineralogy, (4) cation-exchange capacity, and (5) carbonate content. Thin sections of selected sediment material were made for petrographic examination. Preliminary interpretations indicate that (1) it may be possible to distinguish the various sediment interbeds on the basis of their mineralogy, (2) the presence of carbonate horizons in sedimentary interbeds may be utilized to approximate the time of exposure and the climate while the surface was exposed (which affected the hydrogeologic character of the sediment), and the type and orientation of fracture-filling material may be utilized to determine the mechanism by which fractures were filled. (USGS)

  20. Early Miocene Antarctic glacial history: new insights from heavy mineral analysis from ANDRILL AND-2A drill core sediments

    NASA Astrophysics Data System (ADS)

    Iacoviello, Francesco; Giorgetti, Giovanna; Turbanti Memmi, Isabella; Passchier, Sandra

    2015-04-01

    The present study deals with heavy mineral analysis of late Early Miocene marine sediments recovered in the McMurdo Sound region (Ross Sea, Antarctica) during the ANDRILL—SMS Project in 2007. The main objective is to investigate how heavy mineral assemblages reflect different source rocks and hence different provenance areas. These data contribute to a better understanding of East Antarctica ice dynamics in the Ross Sea sector during the Early Miocene (17.6-20.2 Ma), a time of long-term global warming and sea level rise. The AND-2A drill core recovered several stratigraphic intervals that span from Early Miocene to Pleistocene and it collected a variety of terrigenous lithologies. The heavy mineral assemblages of the lower 650-m-thick sedimentary succession were analyzed through SEM observations and SEM-EDS microanalyses on heavy mineral grains. The heavy mineral analysis shows that the sediments are a mix of detritus dominated by McMurdo Volcanic Group sources most likely located in the present-day Mount Morning area (Proto-Mount Morning) with minor contribution from Transantarctic Mountains source rocks located west of the drill site. The heavy mineral assemblages in Interval 1 indicate that between 20.2 and 20.1 Ma, the grounding line of the ice sheet advanced to a position near the present-day Mount Morning volcanic center. During deposition of Interval 2 (20.1-19.3 Ma), the ice sheet most likely experienced a dynamic behavior with interval of ice advance alternating with periods of ice retreat, while Interval 3 (19.3-18.7 Ma) records further retreat to open water conditions. A dynamic behavior is noted in Interval 4 (18.7-17.6 Ma) with a decreasing contribution of materials derived from the basalts of the Mount Morning volcanic center located to the south of the drill site and a consequent increasing contribution of materials derived from the Transantarctic Mountains to the west of the drill site.

  1. Minerals in fractures of the saturated zone from drill core USW G-4, Yucca Mountain, Nye County, Nevada

    SciTech Connect

    Carlos, B.A.

    1987-04-01

    The minerals in fractures in drill core USW G-4, from the static water level (SWL) at 1770 ft to the base of the hole at 3000 ft, were studied to determine their identity and depositional sequence and to compare them with those found above the SWL in the same drill hole. There is no change in mineralogy or mineral morphology across the SWL. The significant change in mineralogy and relationship to the host rock occurs at 1381 ft, well above the present water table. Below 1381 ft clinoptilolite appears in the fractures and rock matrix instead of heulandite, and the fracture mineralogy correlates with the host rock mineralogy. Throughout most of the saturated zone (below the SWL) in USW G-4, zeolites occur in fractures only in zeolitic tuff; however, zeolites persist in fracture below the base of the deepest zeolitic tuff interval. Nonzeolitic intervals of tuff have fewer fractures, and many of these have no coatings; a few have quartz and feldspar coatings. One interval in zeolitic tuff (2125-2140 ft) contains abundant crisobalite coatings in the fractures. Calcite occurs in fractures from 2575 to 2660 ft, usually with the manganese mineral hollandite, and from 2750 to 2765 ft, usually alone. Manganese minerals occur in several intervals. The spatial correlation of zeolites in fractures with zeolitic host rock suggests that both may have been zeolitized at the same time, possibly by water moving laterally through more permeable zones in the tuff. The continuation of zeolites in fractures below the lowest zeolitic interval in this hole suggests that vertical fracture flow may have been important in the deposition of these coatings. Core from deeper intervals in another hole will be examined to determine if that relationship continues. 17 refs., 19 figs.

  2. Alteration of hyaloclastites in the HSDP 2 Phase 1 Drill Core 1. Description and paragenesis

    E-print Network

    Walton, Anthony W.; Schiffman, Peter

    2003-05-01

    ro m el an e R 04 59 3 36 31 .1 (1 10 6. 8) H ya lo cl as ti te In ci pi en t N on e ob se rv ed V er y th in , fa in tl y bi re fr in ge nt gr ai n co at in gs R 04 66 1. 1 to 1. 2 40 22 .2 (1 22 6. 0) H ya lo cl as ti te In ci pi en t T ub ul es.... Geochemistry Geophysics Geosystems G3 walton and schiffman: alteration of hyaloclastites 10.1029/2002GC000368 4 of 31 T ab le 1. H ya lo cl as ti te S am pl es E xa m in ed D ur in g T hi s S tu dy a R un an d di st . be lo w ru n to p, ft S ub se a de pt h, ft...

  3. Cretaceous shallow drilling, U.S. Western Interior: Core research. Final technical report

    SciTech Connect

    Arthur, M.A.

    1998-07-08

    The primary objective of the project is to construct a subsurface transect of Cretaceous strata that were deposited in the Kansas-Colorado-Utah corridor, going from marine sequences that contain organic-carbon-rich hydrocarbon source rocks in Kansas and eastern Colorado to nearshore coal-bearing units in western Colorado and Utah. The drilling transect will provide continuous, unweathered samples for inorganic, organic, and isotopic geochemical studies and mineralogical investigations to determine the characteristics of hydrocarbon source rocks. This transect also will provide information on the extent of thermal maturation and migration of hydrocarbons in organic-carbon-rich strata along a burial gradient. In addition, the eastern Colorado hole will provide characteristics of an important fractured reservoir (the Pierre Shale) in the Florence oil field, the oldest continuously producing field in the United States (>100 years; 600 wells; >14 Mbbls).

  4. Oxygen and carbon isotope ratios of hydrothermal minerals from Yellowstone drill cores

    USGS Publications Warehouse

    Sturchio, N.C.; Keith, T.E.C.; Muehlenbachs, K.

    1990-01-01

    Oxygen and carbon isotope ratios were measured for hydrothermal minerals (silica, clay and calcite) from fractures and vugs in altered rhyolite, located between 28 and 129 m below surface (in situ temperatures ranging from 81 to 199??C) in Yellowstone drill holes. The purpose of this study was to investigate the mechanism of formation of these minerals. The ??18O values of the thirty-two analyzed silica samples (quartz, chalcedony, ??-cristobalite, and ??-cristobalite) range from -7.5 to +2.8???. About one third of the silica 7samples have ??18O values that are consistent with isotopic equilibrium with present thermal waters; most of the other silica samples appear to have precipitated from water enriched in 18O (up to 4.7???) relative to present thermal water, assuming precipitation at present in situ temperatures. Available data on fluid-inclusion homogenization temperatures in hydrothermal quartz indicate that silica precipitation occurred mostly at temperatures above those measured during drilling and imply that 15O enrichments in water during silica precipitation were generally larger than those estimated from present conditions. Similarly, clay minerals (celadonite and smectite) have ??18O values higher (by 3.5 to 7.9???) than equilibrium values under present conditions. In contrast, all eight analyzed calcite samples are close to isotopic equilibrium with present thermal waters. The frequent incidence of apparent 18O enrichment in thermal water from which the hydrothermal minerals precipitated may indicate that a higher proportion of strongly 18O-enriched deep hydrothermal fluid once circulated through shallow portions of the Yellowstone system, or that a recurring transient 18O-enrichment effect occurs at shallow depths and is caused either by sudden decompressional boiling or by isotopic exchange at low water/rock ratios in new fractures. The mineralogy and apparent 18O enrichments of hydrothermal fracture-filling minerals are consistent with deposition during transient boiling or rock-water exchange (fracturing) events. ?? 1990.

  5. Magnetostratigraphy of drill-core SG-1b in the western Qaidam Basin (NE Tibetan Plateau) and tectonic implications

    NASA Astrophysics Data System (ADS)

    Zhang, Weilin; Appel, Erwin; Fang, Xiaomin; Song, Chunhui; Setzer, Fabian; Herb, Christian; Yan, Maodu

    2014-04-01

    The Qaidam Basin is an ideal archive to study long-term climate and erosion histories at the NE Tibetan Plateau. We present a magnetostratigraphic study of the 723 m deep drill-core SG-1b of lacustrine sediments at the Jianshan anticline in the western Qaidam Basin. The polarity sequence shows 18 normal and 19 reverse polarity zones which can be readily correlated with chrons C1n-C3Br of the Geomagnetic Polarity Time Scale 2004 (GPTS 2004), dating the core at about 7.3-1.6 Ma. The resulting mean sediment accumulation rate (SAR) between polarity boundaries ranges from 6.5 to 30.4 cm ka-1. High SARs occur within the intervals of >7.3-6.0, 5.2-4.2 and 3.6-2.6 Ma indicating three episodic phases of higher erosion. From the derived variation of SARs and previous results, we conclude that growth strata at the Jianshan anticline started to develop at ˜1.6 Ma by limb rotation. All this we relate to pulse tectonic uplift of the NE Tibetan Plateau and fault-propagation-folding in the Qaidam Basin.

  6. Teaching Marine Geoscience at Sea: Integrated Ocean Drilling Program's School of Rock Explores Cascadia Subduction Zone - Cores, Logs, and ACORKs

    NASA Astrophysics Data System (ADS)

    Reagan, M.; Collins, J.; Ludwig, K. A.; Slough, S.; Delaney, M. L.; Hovan, S. A.; Expedition 328 Scientists

    2010-12-01

    For twelve days this past September, seventeen formal and informal educators from the US, UK, and France joined six instructors and a small science party on the scientific drillship JOIDES Resolution for the Integrated Ocean Drilling Program (IODP)’s Cascadia ACORK Expedition. The educators were part of the annual “School of Rock (SOR)” education program. SOR is coordinated by the U.S. Implementing Organization (USIO) of IODP and is designed to engage participants in seagoing Earth systems research and education workshops onboard the JOIDES Resolution and on shore at the Gulf Coast Core Repository in Texas. The scientific objective of the Cascadia ACORK expedition was to install a new permanent hydrologic observatory at ODP Site 889 to provide long-term monitoring of the pressure at the frontal part of the Cascadia accretionary prism. This year’s SOR workshop focused on how cores, logs, and ACORKs shed light on the hydrology and geology of the Cascadia subduction zone in the Northeast Pacific. In addition to observing the deployment of the ACORK, the SOR participants conducted daily hands-on analyses of archived sediment and hard-rock cores with scientists and technicians who specialize in IODP research using the lab facilities on the ship. Throughout the expedition, participants engaged in different activities and lessons designed to explore the deep biosphere, methane hydrates, paleoceanography, sedimentology, biostratigraphy, seafloor spreading, and drilling technology. The workshop also provided participants with “C3” time; time to communicate their experience using the successful joidesresolution.org website and other tools, make connections to their prior knowledge and expertise, and to be creative in developing and planning new education and outreach activities based on their new knowledge and research. As part of participating in the expedition, participants committed to further developing and testing their education and outreach products after the expedition, conducting post-expedition projects in conjunction with the U.S. Implementing Organization and their own institutions, and to participating actively in post-cruise evaluation. Since its inception in 2005, 75 SOR graduates and staff have conducted over 150 workshops and short courses for 3,000 participants in more than 30 U.S. states and five other nations. Integral to the success of the program is the evaluation process that takes place during and after each SOR. In particular, SOR evaluations take advantage of the power of video data collection to demonstrate the transformative nature of SOR expeditions. Video evaluations offer a unique opportunity to collect and preserve participant “voice” to document true transformative broader impacts. Along with video evaluations, the program also employs more traditional evaluation methods such as internal evaluator observations, open-ended questionnaires, and participant journals.

  7. Effects of fluids on faulting within active fault zones - evidence from drill core samples recovered during the San Andreas Fault Observatory at Depth (SAFOD) drilling project

    NASA Astrophysics Data System (ADS)

    Janssen, C.; Wirth, R.; Kienast, M.; Morales, L. G.; Rybacki, E.; Wenk, H.; Dresen, G. H.

    2011-12-01

    Low temperature microstructures observed in samples from SAFOD drill cores indicate fluid-related deformation and chemical reactions occurring simultaneously and interacting with each other. Transmission Electron Microscopy (TEM) observations, document open pores that formed in-situ during or after deformation. In TEM images, many pores with high aspect ratio appear to be unconnected. They were possibly filled with formation water and/or hydrothermal fluids suggesting that elevated pore fluid pressure exist in the fault gouge, preventing pore collapse. The chemical influence of fluids on mineralogical alteration and geomechanical processes in fault rocks is visible in pronounced dissolution-precipitation processes (stylolites, solution seams) as well as in the formation of new phases. Detrital quartz and feldspar grains are partially dissolved and replaced by authigenic illite-smectite (I-S) mixed-layer clay minerals. TEM imaging of these grains reveals that the alteration processes initiated within pores and small intra-grain fissures. In few samples syntectonic fluid-assisted overgrowth of chlorite-rich films on slickensides partly replaced sedimentary quartz grains. Quartz and feldspar grains are partially dissolved with sutured boundaries. Newly-formed phyllosilicates are illite-smectite phases, Mg-rich smectites and chlorite minerals. They are very fine-grained (down to 20 nm) and nucleate at grain surfaces (interfaces), which in many cases are pore or fracture walls. These relatively straight or curved crystals grow into open pore spaces and fractures. They are arranged in a card-house fabric with open pore spaces between the flakes. Locally, clay flakes are bent, folded or show sigmoidal shapes indicating that they were involved in faulting. The clay particles do not show a preferred shape orientation. The predominantly random orientation distribution of the clay minerals was confirmed by x-ray synchrotron texture analysis. Pole figures show very weak textures with maxima around 1.2 m.r.d. and minima around around 0.8 m.r.d., indicating that a majority of crystals are oriented randomly. The dominance of randomly oriented clay particles, characterized by weak fabrics, may influence the mechanical stability of fault zone rocks. Formation of secondary calcite cement reveals fluid-assisted fracture healing. Cathodoluminescence microscopy shows at least three different generations of calcite veins confined to lithoclasts, displaying dissolution seams. Additionally, crack and seal processes in K-feldspar are identified. The calcite grains exhibit different degrees of deformation with evidence for twinning and crystal plasticity.

  8. Rationale and geophysical evidence for quasi-geostrophic rapid dynamics within the Earth's outer core

    E-print Network

    Paris-Sud XI, Université de

    in the Earth's core, for the time scales of the historical secular variation, is well described by a quasi exhibit a columnar behaviour at parameters representative of the Earth's core, supporting the quasi of the secular variation than a flow without specified geometry. Keywords: Earth's core, quasi

  9. Magnetic properties of drill core and surface samples from the Calico Hills area, Nye County, Nevada

    USGS Publications Warehouse

    Baldwin, M.J.; Jahren, C.E.

    1982-01-01

    The interpretation of the aeromagnetic survey of the Calico Hills area of the Nevada Test Site, Nye County, Nevada, required the determination of magnetic properties of rocks exposed in the region. Eighty-two samples representing a variety of units found at the surface show that most rocks in the Calico Hills, other than parts of the Eleana Formation, are relatively nonmagnetic. The magnetic vector of the Eleana Formation at the surface was found to point northward and downward. Remanence directions were scattered, but a remanence azimuth of 16? east of north was assigned on the basis of present-day declination. Measurements of 123 samples of the Eleana Formation from the exploratory drill hole UE25a-3 indicate that some facies are strongly magnetic. The average total magnetization of the argillite samples is 3.89 A/m (0.00389 emu). These samples have an average natural remanent inclination of 76?. Results of demagnetization demonstrated that this relatively high inclination is due, at least in part, to a soft vertical component of remanent magnetization. The magnitude of the component could not be determined. Further tests showed that the tendency to pick up a soft component of magnetism may be a function of rock type. Inhomogeneity of the Eleana argillite was probably the cause of some differences in remanence values between large and small samples from the same depth.

  10. Core Angular Momentum and the IERS Sub-Centers Activity for Monitoring Global Geophysical Fluids. Part 1; Core Angular Momentum and Earth Rotation

    NASA Technical Reports Server (NTRS)

    Song, Xia-Dong; Chao, Benjamin (Technical Monitor)

    1999-01-01

    The part of the grant was to use recordings of seismic waves travelling through the earth's core (PKP waves) to study the inner core rotation and constraints on possible density anomalies in the fluid core. The shapes and relative arrival times of such waves associated with a common source were used to reduce the uncertainties in source location and excitation and the effect of unknown mantle structure. The major effort of the project is to assemble historical seismograms with long observing base lines. We have found original paper records of SSI earthquakes at COL between 1951 and 1966 in a warehouse of the U.S. Geological Survey office in Golden, Colorado, extending the previous measurements at COL by Song and Richards [1996] further back 15 years. Also in Alaska, the University of Alaska, Fairbanks Geophysical Institute (UAFGI) has been operating the Alaskan Seismic Network with over 100 stations since the late 1960s. Virtually complete archives of seismograms are still available at UAFGI. Unfortunately, most of the archives are in microchip form (develocorders), for which the use of waveforms is impossible. Paper seismograms (helicorders) are available for a limited number of stations, and digital recordings of analog signals started around 1989. Of the paper records obtained, stations at Gilmore Dome (GLM, very close to COL), Yukon (FYU), McKinley (MCK), and Sheep Creek Mountain (SCM) have the most complete continuous recordings.

  11. GEOPHYSICAL RESEARCH LETTERS, VOL. 13, NO. 13, PAGES 1517-1520, DECEMBER 1986 INTERACTION OF MANTLE DREGS WITH CONVECTION: LATERAL HETEROGENEITY AT THE CORE-MANTLE BOUNDARY

    E-print Network

    Greer, Julia R.

    GEOPHYSICAL RESEARCH LETTERS, VOL. 13, NO. 13, PAGES 1517-1520, DECEMBER 1986 INTERACTION OF MANTLE DREGS WITH CONVECTION: LATERAL HETEROGENEITY AT THE CORE-MANTLE BOUNDARY Geoffrey F. Davies and Michael models indicate that chemically denser material (dregs) at the base of the mantle would have substantial

  12. Constraints on magma ascent, emplacement, and eruption: geochemical and mineralogical data from drill-core samples at Obsidian dome, Inyo chain, California

    SciTech Connect

    Vogel, T.A.; Younker, L.W.; Schuraytz, B.C.

    1987-05-01

    Systematic chemical and mineralogical variability occurs in samples from drill holes through Obsidian dome, the conduit to the dome, and a nearby associated feeder dike. The drill-hole samples from the margins of the conduit and most of the lower part of the dome are high-Ba, low-silica rhyolites; they contain two populations of phenocrysts and represent commingled magmas, whereas samples from the dike and upper parts of the dome are low-Ba, higher silica rhyolites that do not reflect commingled magmas. Samples from the center of the conduit are low-Ba, higher silica rhyolites that are only slightly mixed. A major part of the variability within the drill-core samples of the dome and conduit reflects the juxtaposition and commingling of two distinct magmas during their passage through the conduit.

  13. Acoustic investigations of lakes as justification for optimal core drilling and sampling location in paleomagnetic study

    NASA Astrophysics Data System (ADS)

    Krylov, Pavel; Nourgaliev, Danis; Yasonov, Pavel

    2015-04-01

    Lacustrine sediments contain a long, high-resolution record of sedimentation processes associated with changes in the environment. Paleomagnetic studies of the sediments properties provide a detailed trace of changes in paleoenvironment. However, there are factors such as landslides, earthquakes, and the presence of gas in sediments affecting the distributing sediment stratification. Seismic profiling allows investigating in details the bottom relief and getting information about the thickness and structure of deposits, which makes this method ideally suitable for determining the configuration of the lake basin and the overlying lake sediment stratigraphy. Most seismic studies have concentrated on large and deep lakes containing a thick sedimentary sequence, but small and shallow lakes containing a thinner sedimentary column located in key geographic locations and geological settings can also provide a valuable record of Holocene history. Seismic data is crucial in choosing optimal core sampling location. Thus, continuous seismic profiling should be used regularly before coring lake sediments for the reconstruction of paleoclimate. We have carried out seismic profiling on lakes Balkhash (Kazakhstan), Yarovoye, Kangrykyl, Aslykul, Kisigach, Plescheevo, Sunukyl and Chebarkul (Russia).

  14. Petrological and Geochemical Studies of Samples from the Nicor Chestnut 18-4 Drill Core, AMES Impact Structure, Oklahoma

    NASA Astrophysics Data System (ADS)

    Koeberl, C.; Reimold, W. U.

    1996-03-01

    The near-circular 15-km-diameter Ames structure is located at 36 degrees 15' N and 98 degrees 12' W in southeastern Major County (NW Oklahoma). The structure, which is set in Cambro-Ordovician Arbuckle dolomite, consists of two concentric rims, an outer rim, which is about 1.5 to 3 km wide, and an inner "rim". The rocks of the outer rim consist mainly of fractured and brecciated Arbuckle dolomite. The inner "ring" (about 5 km in diameter) seems to be the eroded remnant of a central structural uplift, with rocks comprising brecciated Precambrian granite and Arbuckle dolomite. The depression is covered by Middle Ordovician Oil Creek shale. The structure is penetrated by a number of oil- and gas-producing wells in the crater rim and the central uplift. The production from these wells indicate that Ames represents one of the largest - if not the largest - single oil fields in Oklahoma. Currently the structural disturbance is buried beneath almost 3000 m of sedimentary rock. The origin of the structure has been intensely debated since the discovery of the structural anomaly, but geophysical and geological, as well as petrological and geochemical data provide very good evidence that it was formed by impact, and not by volcanism or even more esoteric processes. In the present study, we analyzed 17 samples, including impact melt breccia, from the Nicor Chestnut 18-4 core. These samples represent the largest and best examples of impact melt breccias and melt rock obtained so far from the Ames structure. One important result of the petrographic analyses is the observation that not all carbonate rocks postdate the impact, but some were clearly present among the target rocks. The chemical composition of the impact melt breccias is similar to that of other melt rocks from the Dorothy 1-19 core, as well as to the target granite, with variable carbonate admixtures. Some impact melt rocks are enriched in siderophile elements, indicating a possible meteoritic component.

  15. Environmental Health Research Recommendations from the Inter-Environmental Health Sciences Core Center Working Group on Unconventional Natural Gas Drilling Operations

    PubMed Central

    Breysse, Patrick N.; Gray, Kathleen; Howarth, Marilyn; Yan, Beizhan

    2014-01-01

    Background: Unconventional natural gas drilling operations (UNGDO) (which include hydraulic fracturing and horizontal drilling) supply an energy source that is potentially cleaner than liquid or solid fossil fuels and may provide a route to energy independence. However, significant concerns have arisen due to the lack of research on the public health impact of UNGDO. Objectives: Environmental Health Sciences Core Centers (EHSCCs), funded by the National Institute of Environmental Health Sciences (NIEHS), formed a working group to review the literature on the potential public health impact of UNGDO and to make recommendations for needed research. Discussion: The Inter-EHSCC Working Group concluded that a potential for water and air pollution exists that might endanger public health, and that the social fabric of communities could be impacted by the rapid emergence of drilling operations. The working group recommends research to inform how potential risks could be mitigated. Conclusions: Research on exposure and health outcomes related to UNGDO is urgently needed, and community engagement is essential in the design of such studies. Citation: Penning TM, Breysse PN, Gray K, Howarth M, Yan B. 2014. Environmental health research recommendations from the Inter-Environmental Health Sciences Core Center Working Group on Unconventional Natural Gas Drilling Operations. Environ Health Perspect 122:1155–1159;?http://dx.doi.org/10.1289/ehp.1408207 PMID:25036093

  16. The first microbiological contamination assessment by deep-sea drilling and coring by the D/V Chikyu at the Iheya North hydrothermal field in the Mid-Okinawa Trough (IODP Expedition 331)

    PubMed Central

    Yanagawa, Katsunori; Nunoura, Takuro; McAllister, Sean M.; Hirai, Miho; Breuker, Anja; Brandt, Leah; House, Christopher H.; Moyer, Craig L.; Birrien, Jean-Louis; Aoike, Kan; Sunamura, Michinari; Urabe, Tetsuro; Mottl, Michael J.; Takai, Ken

    2013-01-01

    During the Integrated Ocean Drilling Program (IODP) Expedition 331 at the Iheya North hydrothermal system in the Mid-Okinawa Trough by the D/V Chikyu, we conducted microbiological contamination tests of the drilling and coring operations. The contamination from the drilling mud fluids was assessed using both perfluorocarbon tracers (PFT) and fluorescent microsphere beads. PFT infiltration was detected from the periphery of almost all whole round cores (WRCs). By contrast, fluorescent microspheres were not detected in hydrothermally active core samples, possibly due to thermal decomposition of the microspheres under high-temperature conditions. Microbial contamination from drilling mud fluids to the core interior subsamples was further characterized by molecular-based evaluation. The microbial 16S rRNA gene phylotype compositions in the drilling mud fluids were mainly composed of sequences of Beta- and Gammaproteobacteria, and Bacteroidetes and not archaeal sequences. The phylotypes that displayed more than 97% similarity to the sequences obtained from the drilling mud fluids were defined as possible contaminants in this study and were detected as minor components of the bacterial phylotype compositions in 13 of 37 core samples. The degree of microbiological contamination was consistent with that determined by the PFT and/or microsphere assessments. This study suggests a constructive approach for evaluation and eliminating microbial contamination during riser-less drilling and coring operations by the D/V Chikyu. PMID:24265628

  17. Fluid Inclusions in Salton Sea Scientific Drilling Project Core: Preliminary Results

    NASA Astrophysics Data System (ADS)

    Roedder, Edwin; Howard, Kevin W.

    1988-11-01

    Fluid inclusions (191) in calcite, quartz, K-feldspar, and epidote from ?l-mm veinlets in cores and well cuttings from 604-2560 m homogenize from 217° to >500°C and vary widely in salinity, suggesting a complex history of fluids surrounding these samples. No daughter minerals were seen, and no clathrates were recognized on freezing. Vapor-rich inclusions under pressure, presumably containing CO2 and/or CH4, were found from a wide range of depths, suggesting that effervescence has occurred. Low-salinity fluids (1.2 -4.0 wt % NaCl eq) were present as deep as 1939 m. The data can be explained by a combination of processes such as thermal metamorphism of evaporites and other sediments and mixing of water from metamorphic dehydration reactions with partly evaporated Colorado River water.

  18. Core cracking and hydrothermal circulation can profoundly affect Ceres' geophysical evolution

    NASA Astrophysics Data System (ADS)

    Neveu, Marc; Desch, Steven J.; Castillo-Rogez, Julie C.

    2015-02-01

    Observations and models of Ceres suggest that its evolution was shaped by interactions between liquid water and silicate rock. Hydrothermal processes in a heated core require both fractured rock and liquid. Using a new core cracking model coupled to a thermal evolution code, we find volumes of fractured rock always large enough for significant interaction to occur. Therefore, liquid persistence is key. It is favored by antifreezes such as ammonia, by silicate dehydration which releases liquid, and by hydrothermal circulation itself, which enhances heat transport into the hydrosphere. The effect of heating from silicate hydration seems minor. Hydrothermal circulation can profoundly affect Ceres' evolution: it prevents core dehydration via "temperature resets," core cooling events lasting ˜50 Myr during which Ceres' interior temperature profile becomes very shallow and its hydrosphere is largely liquid. Whether Ceres has experienced such extensive hydrothermalism may be determined through examination of its present-day structure. A large, fully hydrated core (radius 420 km) would suggest that extensive hydrothermal circulation prevented core dehydration. A small, dry core (radius 350 km) suggests early dehydration from short-lived radionuclides, with shallow hydrothermalism at best. Intermediate structures with a partially dehydrated core seem ambiguous, compatible both with late partial dehydration without hydrothermal circulation, and with early dehydration with extensive hydrothermal circulation. Thus, gravity measurements by the Dawn orbiter, whose arrival at Ceres is imminent, could help discriminate between scenarios for Ceres' evolution.

  19. `Building Core Knowledge - Reconstructing Earth History': Transforming Undergraduate Instruction by Bringing Ocean Drilling Science on Earth History and Global Climate Change into the Classroom (Invited)

    Microsoft Academic Search

    K. St. John; R. M. Leckie; M. H. Jones; K. S. Pound; E. Pyle; L. A. Krissek

    2009-01-01

    This NSF-funded, Phase 1 CCLI project effectively integrates scientific ocean drilling data and research (DSDP-ODP-IODP-ANDRILL) with education. We have developed, and are currently testing, a suite of data-rich inquiry-based classroom learning materials based on sediment core archives. These materials are suitable for use in introductory geoscience courses that serve general education students, early geoscience majors, and pre-service teachers. 'Science made

  20. Seismic evidence for the Pleistocene depositional changes in Lake Hovsgol, Mongolia, and implications for the age model and the sediment grain size record of KDP-01 drill core

    Microsoft Academic Search

    Alexander A. Prokopenko; Christopher St. G. C. Kendall

    2008-01-01

    This paper seeks to arrive at a consistent interpretation of (1) the age model, (2) the grain size record, and (3) seismic\\u000a reflection data from Lake Hovsgol (a.k.a Khubsugul or Hövsgöl), Mongolia, reported by Fedotov et al. (2007, earlier by Fedotov et al. 2002, 2004). In their most recent contribution, the grain size record of the KDP-01 drill core is interpreted as

  1. Physical properties of fault zone rocks from SAFOD: Tying logging data to high-pressure measurements on drill core

    NASA Astrophysics Data System (ADS)

    Jeppson, T.; Tobin, H. J.

    2013-12-01

    In the summer of 2005, Phase 2 of the San Andreas Fault Observatory at Depth (SAFOD) borehole was completed and logged with wireline tools including a dipole sonic tool to measure P- and S-wave velocities. A zone of anomalously low velocity was detected from 3150 to 3414 m measured depth (MD), corresponding with the subsurface location of the San Andreas Fault Zone (SAFZ). This low velocity zone is 5-30% slower than the surrounding host rock. Within this broad low-velocity zone, several slip surfaces were identified as well as two actively deforming shear zones: the southwest deformation zone (SDZ) and the central deformation zone (CDZ), located at 3192 and 3302 m MD, respectively. The SAFZ had also previously been identified as a low velocity zone in seismic velocity inversion models. The anomalously low velocity was hypothesized to result from either (a) brittle deformation in the damage zone of the fault, (b) high fluid pressures with in the fault zone, or (c) lithological variation, or a combination of the above. We measured P- and S-wave velocities at ultrasonic frequencies on saturated 2.5 cm diameter core plug samples taken from SAFOD core obtained in 2007 from within the low velocity zone. The resulting values fall into two distinct groups: foliated fault gouge and non-gouge. Samples of the foliated fault gouge have P-wave velocities between 2.3-3.5 km/s while non-gouge samples lie between 4.1-5.4 km/s over a range of effective pressures from 5-70 MPa. There is a good correlation between the log measurements and laboratory values of P-and S wave velocity at in situ pressure conditions especially for the foliated fault gouge. For non-gouge samples the laboratory values are approximately 0.08-0.73 km/s faster than the log values. This difference places the non-gouge velocities within the Great Valley siltstone velocity range, as measured by logs and ultrasonic measurements performed on outcrop samples. As a high fluid pressure zone was not encountered during SAFOD drilling, we use the ultrasonic velocities of SAFOD core and analogous outcrop samples to determine if the velocity reduction is due to lithologic variations or the presence of deformational fabrics and alteration in the fault zone. Preliminary analysis indicates that while the decrease in velocity across the broad fault zone is heavily influenced by fractures, the extremely low velocities associated with the actively deforming zones are more likely caused by the development of scaly fabric with clay coatings on the fracture surfaces. Analysis of thin sections and well logs are used to support this interpretation.

  2. A geophysical study of oceanic core complexes and surrounding terrain, Mid-Atlantic Ridge 13°N-14°N

    NASA Astrophysics Data System (ADS)

    Mallows, C.; Searle, R. C.

    2012-06-01

    We describe a geophysical study of oceanic core complexes (OCC) and surrounding seafloor on the Mid-Atlantic Ridge at 13°N-14°N and off-axis to ˜1.9 Myr. Data include a detailed, deep-towed side scan sonar, magnetic field and bathymetry survey, supplemented by concurrent sea-surface bathymetry, magnetic field and gravity measurements. Using side scan and bathymetry, we infer areas and relative ages of seafloor volcanism, revealing a complex pattern of melt accretion across the median valley including close to its walls. We estimate tectonic and magmatic extension throughout the area, and find that average tectonic extension since chron 2 on plates containing OCCs is up to three times that on their conjugates. Deep-towed magnetic data reveal asymmetric spreading (faster on OCC-containing plates) and crustal magnetization that is highly heterogeneous on a scale of ˜5 km, suggesting that exhumed domes of OCCs have highly variable lithologies, perhaps comprising both serpentinized peridotite and gabbro. Improved fits to magnetic data are provided by models incorporating ˜45°of OCC footwall rotation. An axial zone of normal magnetization, of presumed Brunhes epoch, has highly variable width and amplitude, with parts of the ridge axis displaying very low or apparently reversed magnetization. Gravity requires that OCCs have dense cores capped by lower density zones several kilometers thick. Gravity data indicate longer term patterns of crustal thickness and melt distribution that are broadly consistent with numerical models of OCC formation and show that waxing magmatism may terminate OCCs.

  3. A two century record of strontium isotopes from an ice core drilled at Mt Blanc, France

    NASA Astrophysics Data System (ADS)

    Burton, G. R.; Rosman, K. J. R.; Van de Velde, K. P.; Boutron, C. F.

    2006-08-01

    New techniques which allow small amounts of Sr to be reliably analysed [G.R. Burton, V.I. Morgan, C.F. Boutron, K.J.R. Rosman, High-sensitivity measurements of strontium isotopes in polar ice, Anal. Chim. Acta 469 (2002) 225-233] by TIMS (Thermal Ionisation Mass Spectrometry) have been used to measure the isotopic composition of Sr and the concentration of Rb and Sr at sub-nanogram per gram levels in a Mt Blanc snow and ice core. This two century time series of Sr isotopes is the first to be reported in an Alpine glacier. The Sr and Rb concentrations range from 3 ng/g to 20 pg/g and 1 ng/g to 10 pg/g, respectively, with higher concentrations evident in more recent times. This trend is consistent with that reported previously for other metals such as Cd, Cu and Zn [K. Van de Velde, C. Barbante, G. Cozzi, I. Moret, T. Bellomi, C. Ferrari, C. Boutron, Changes in the occurrence of silver, gold, platinum, palladium and rhodium in Mont Blanc ice and snow since the 18th century, Atmos. Environ. 34 (2000) 3117-3127; K. Van de Velde, C. Boutron, C. Ferrari, T. Bellomi, C. Barbante, S. Rudnev, M. Bolshov, Seasonal variations of heavy metals in the 1960s Alpine ice: sources versus meteorological factors, Earth Planet. Sci. Lett. 164 (1998) 521-533; K.J.R. Rosman, C. Ly, K. Van de Velde, C.F. Boutron, A two century record of lead isotopes in high altitude Alpine snow and ice, Earth Planet. Sci. Lett. 176 (2000) 413-424]. The 87Sr/ 86Sr ratios vary between 0.7020 and 0.7176 and display relatively larger variations in recent times which have been attributed to seasonal variations made evident by the increased sampling resolution available at shallower depths. No change with time is evident in this ratio which has a mean value of ˜ 0.712 and is similar to Glacial ice at Summit Greenland, suggesting that aerosols reaching Mt Blanc represent the same mixture of sources. Also, anthropogenic sources would appear to have the same isotopic ratio. The presence of Saharan dust in some samples is confirmed here by their strontium isotopic ratios.

  4. Drilling through the largest magma chamber on Earth: Bushveld Igneous Complex Drilling Project (BICDP)

    NASA Astrophysics Data System (ADS)

    Trumbull, R. B.; Ashwal, L. D.; Webb, S. J.; Veksler, I. V.

    2015-05-01

    A scientific drilling project in the Bushveld Igneous Complex in South Africa has been proposed to contribute to the following scientific topics of the International Continental Drilling Program (ICDP): large igneous provinces and mantle plumes, natural resources, volcanic systems and thermal regimes, and deep life. An interdisciplinary team of researchers from eight countries met in Johannesburg to exchange ideas about the scientific objectives and a drilling strategy to achieve them. The workshop identified drilling targets in each of the three main lobes of the Bushveld Complex, which will integrate existing drill cores with new boreholes to establish permanently curated and accessible reference profiles of the Bushveld Complex. Coordinated studies of this material will address fundamental questions related to the origin and evolution of parental Bushveld magma(s), the magma chamber processes that caused layering and ore formation, and the role of crust vs. mantle in the genesis of Bushveld granites and felsic volcanic units. Other objectives are to study geophysical and geodynamic aspects of the Bushveld intrusion, including crustal stresses and thermal gradient, and to determine the nature of deep groundwater systems and the biology of subsurface microbial communities.

  5. Drilling and Logging in Space; An Oil-Well Perspective

    Microsoft Academic Search

    Max Peeters; Brad Blair

    2000-01-01

    Growing interest in extraterrestrial subsurface exploration has prompted an examination of advanced technologies for drilling slim holes and obtaining geophysical data in these holes. The borehole surveys with geophysical measurements called \\

  6. Summary of micrographic analysis of fracture coating phases on drill cores from Pahute Mesa, Nevada Test Site. Revision 1

    SciTech Connect

    NONE

    1998-12-01

    The flow path between Pahute Mesa and the groundwater discharge area in Oasis Valley (approximately 18 miles to the southwest) is of concern due to the relatively short travel distance between a recharge area where underground nuclear testing has been conducted and the off-site water users. Groundwater flow and transport modeling by IT Corporation (IT) has shown rapid tritium transport in the volcanic rock aquifers along this flow path. The resultant estimates of rapid transport were based on water level data, limited hydraulic conductivity data, estimates of groundwater discharge rates in Oasis Valley, assumed porosities, and estimated retardation rates. Many of these parameters are poorly constrained and may vary considerably. Sampling and analytical techniques are being applied as an independent means to determine transport rates by providing an understanding of the geochemical processes that control solute movement along the flow path. As part of these geochemical investigations, this report summarizes the analysis of fracture coating mineral phases from drill core samples from the Pahute mesa area of the Nevada Test Site (NTS). Archived samples were collected based on the presence of natural fractures and on the types and abundance of secondary mineral phases present on those fracture surfaces. Mineral phases present along fracture surfaces are significant because, through the process of water-rock interaction, they can either contribute (as a result of dissolution) or remove (as a result of precipitation or adsorption) constituents from solution. Particular attention was paid to secondary calcite occurrences because they represent a potential source of exchangeable carbon and can interact with groundwater resulting in a modified isotopic signature and apparent water age.

  7. Preliminary Stratigraphy and First Petrographic and Geochemical Results from the ICDP Drill Core from E?gygytgyn Crater (Russia)

    NASA Astrophysics Data System (ADS)

    Raschke, U.; Reimold, W. U.; Schmitt, R. T.

    2011-03-01

    The first lithological description and geochemical analysis of the 2009 drilled (ICDP-Project) impact rocks of the E?gygytgyn-crater in northeast Siberia. It is one of the best-preserved impact craters in silicious rocks.

  8. Variations in authigenic mineralogy and sorptive zeolite abundance at Yucca Mountain, Nevada, based on studies of drill cores USW GU-3 and G-3

    SciTech Connect

    Vaniman, D.; Bish, D.; Broxton, D.; Byers, F.; Heiken, G.; Carlos, B.; Semarge, E.; Caporuscio, F.; Gooley, R.

    1984-06-01

    Drill Hole USW GU-3 was cored continuously from the surface to a depth of 2637.0 ft (803.8 m) beneath the central crest of Yucca Mountain. Drill Hole USW G-3 was cored continuously from 2625.4 ft (800.2 m) to 5030.8 ft (1533.4 m) nearby. Studies of the mineralogy and petrology of these core samples concentrate on the products of low-temperature diagenetic alteration; they indicate less alteration, and of lower grade, than is noted in any of the cored drill holes from farther north at Yucca Mountain. Relatively unstable primary phases such as glasses, tridymite, and cristobalite are preserved to greater depth. Clinoptilolite persists to greater depth, and authigenic albite, a relatively high-grade secondary mineral, does not occur. Calcite is rare, and mordenite is virtually absent, except for rare occurrences along fractures in the Crater Flat Tuff. Compositional zonation of zeolites is highly variable and poorly correlated with depth, and a clearly defined smectite-to-illite transition is lacking. Smectite interstratifications, poor in illite, indicate a maximum alteration temperature no greater than 40{sup 0}C at the bottom of USW G-3 (5031 ft or 1533 m). All these features contrast sharply with those of samples from the northern part of Yucca Mountain. In particular, the tuff of Calico Hills can not be relied upon as a zeolitized sorptive barrier throughout Yucca Mountain. However, four commonly zeolitized intervals are defined and traced across the exploration block at Yucca Mountain. Analysis of these intervals indicates that equivalent thicknesses of 100% sorptive zeolite range from 24 to 78 m at various localities below any proposed repository in the moderately to densely welded Topopah Spring unit and above the static water level. 26 references, 12 figures, 4 tables.

  9. Structure and impact indicators of the Cretaceous sequence of the ICDP drill core Yaxcopoil-1, Chicxulub impact crater, Mexico

    Microsoft Academic Search

    T. Kenkmann; A. Wittmann; D. Scherler

    2004-01-01

    As part of the ICDP Chicxulub Scientific Drilling Project, the Yaxcopoil-1 (Yax-1) bore hole was drilled 60 km south-southwest of the center of the 180 km-diameter Chicxulub impact structure down to a depth of 1511 m. A sequence of 615 m of deformed Cretaceous carbonates and sulfates was recovered below a 100 m-thick unit of suevitic breccias and 795 m

  10. Ages and stable-isotope compositions of secondary calcite and opal in drill cores from Tertiary volcanic rocks of the Yucca Mountain area, Nevada

    USGS Publications Warehouse

    Szabo, B. J.; Kyser, T.K.

    1990-01-01

    Stable-isotope compositions of fracture- and cavity-filling calcite from the unsaturated zone of three drill cores at Yucca Mountain Tertiary volcanic complex indicate that the water from which the minerals precipitated was probably meteoric in origin. A decrease in 18O in the calcite with depth is interpreted as being due to the increase in temperature in drill holes corresponding to an estimated average geothermal gradient of 34?? per kilometer. A few of the calcite samples and all of the opal samples yielded uranium-series ages older than 400 000 yr, although most of the calcite samples yielded ages between 26 000 and 310 000 yr. The stable-isotope and uranium-series dates from precipitated calcite and opal of this reconnaissance study suggest a complex history of fluid movement through the volcanic pile, and episodes of fracture filling predominantly from meteoric water during at least the past 400 000 yr. -Authors

  11. Ocean drilling program: Recent results and future drilling plans

    Microsoft Academic Search

    P. D. Rabinowitz; T. J. G. Francis; J. G. Baldauf; J. F. Allan; E. A. Heise; J. C. Seymour

    1993-01-01

    The Ocean Drilling Program (ODP) has completed 48 internationally-staffed expeditions of scientific ocean drilling in search of answers relating to the evolution of passive and active continental margins, evolution of oceanic crust, origin and evolution of marine sedimentary sequences, and paleoceanography. During the past year of drilling operations, ODP expeditions cored Cretaceous reef-bearing guyots of the Western Pacific, with the

  12. Crystallization history of Kilauea Iki lava lake as seen in drill core recovered in 1967-1979

    USGS Publications Warehouse

    Helz, R.T.

    1980-01-01

    Kilauea Iki lava lake formed during the 1959 summit eruption, one of the most picritic eruptions of Kilauea Volcano in the twentieth century. Since 1959 the 110 to 122 m thick lake has cooled slowly, developing steadily thickening upper and lower crusts, with a lens of more molten lava in between. Recent coring dates, with maximum depths reached in the center of the lake, are: 1967 (26.5 m). 1975 (44.2 m), 1976 (46.0 m) and 1979 (52.7 m). These depths define the base of the upper crust at the time of drilling. The bulk of the core consists of a gray, olivine-phyric basalt matrix, which locally contains coarser-grained diabasic segregation veins. The most important megascopic variation in the matrix rock is its variation in olivine content. The upper 15 m of crust is very olivine-rich. Abundance and average size of olivine decrease irregularly downward to 23 m; between 23 and 40 m the rock contains 5-10% of small olivine phenocrysts. Below 40 m. olivine content and average grainsize rise sharply. Olivine contents remain high (20-45%, by volume) throughout the lower crust, except for a narrow (< 6 m) olivine depleted zone near the basalt contact. Petrographically the olivine phenocrysts in Kilauea Iki can be divided into two types. Type 1 phenocrysts are large (1-12 mm long), with irregular blocky outlines, and often contain kink bands. Type 2 crystals are relatively small (0.5-2 mm in length), euhedral and undeformed. The variations in olivine content of the matrix rock are almost entirely variations in the amount of type 1 olivines. Sharp mineral layering of any sort is rare in Kilauea Iki. However, the depth range 41-52 m is marked by the frequent occurrence of steeply dipping (70??-90??) bands or bodies of slightly vuggy olivine-rich rock locally capped with a small cupola of segregation-vein material. In thin section there is clear evidence for relative movement of melt and crystals within these structures. The segregation veins occur only in the upper crust. The most widely distributed (occurring from 4.5-59.4 m) are thin veins (most < 5 cm thick), which cut the core at moderate angles and appear to have been derived from the immediately adjacent wall-rock by filter pressing. There is also a series of thicker (0.1-1.5 m) segregation veins, which recur every 2-3 m, between 20 and 52 m. These have subhorizontal contacts and appear, from similarities in thickness and spacing, to correlate between drill holes as much as 100 m apart. These large veins are not derived from the adjacent wallrock: their mechanism of formation is still problematical. The total thickness of segregation veins in Kilauea Iki is 3-6 m in the central part of the lake, corresponding to 6-11% of the upper crust. Whole-rock compositions for Kilauea Iki fall into two groups: the matrix rock ranges from 20-7.5% MgO, while the segregation veins all contain between 6.0 and 4.5% MgO. There are no whole-rock compositions of intermediate MgO content. Samples from < 12 m show eruption-controlled chemistry. Below that depth, matrix rock compositions have higher Al2O3, TiO2 and alkalies, and lower CaO and FeO, at a given MgO content than do the eruption pumices. The probable causes of this are assimilation of low-melting components from foundered crust, plus removal of olivine, plus removal of minor augite, for rocks with MgO contents of < 8.0%. Given the observed rate of growth of the upper crust, one can infer that significant removal of the type 1 olivine phenocrysts from the upper part of the lake began in 1963 and ceased sometime prior to 1972. The process. probably gravitative settling, appears to have been inhibited earlier by gas streaming from the lower part of the lens of melt. The olivine cumulate zone, which extends into the upper crust, contains relatively few (25-40%) olivine crystals, few of which actually touch each other. The diffuseness of the cumulate zone raises the possibility that the crystals were coated with a relatively visous boundary layer

  13. Innovative hyperspectral imaging (HSI) based techniques applied to end-of-life concrete drill core characterization for optimal dismantling and materials recovery

    NASA Astrophysics Data System (ADS)

    Bonifazi, Giuseppe; Picone, Nicoletta; Serranti, Silvia

    2015-02-01

    The reduction of EOL concrete disposal in landfills, together with a lower exploitation of primary raw materials, generates a strong interest to develop, set-up and apply innovative technologies to maximize Construction and Demolition Waste (C&DW) conversion into useful secondary raw materials. Such a goal can be reached starting from a punctual in-situ efficient characterization of the objects to dismantle in order to develop demolition actions aimed to set up innovative mechanical-physical processes to recover the different materials and products to recycle. In this paper an innovative recycling-oriented characterization strategy based on HyperSpectral Imaging (HSI) is described in order to identify aggregates and mortar in drill core samples from end-of-life concrete. To reach this goal, concrete drill cores from a demolition site were systematically investigated by HSI in the short wave infrared field (1000-2500 nm). Results obtained by the adoption of the HSI approach showed as this technology can be successfully applied to analyze quality and characteristics of C&DW before dismantling and as final product to reutilise after demolition-milling-classification actions. The proposed technique and the related recognition logics, through the spectral signature detection of finite physical domains (i.e. concrete slice and/or particle) of different nature and composition, allows; i) to develop characterization procedures able to quantitatively assess end-of-life concrete compositional/textural characteristics and ii) to set up innovative sorting strategies to qualify the different materials constituting drill core samples.

  14. Age Determination for Deep-Sea Cores: Inquiry-based Learning with Authentic Scientific Ocean Drilling Data

    Microsoft Academic Search

    R. M. Leckie; M. H. Jones; K. St. John; K. S. Pound

    2008-01-01

    Marine sediment cores are some of our best archives of past climate change. Imagine that you have access to deep-sea core material from a region of interest. After describing the cores, what next? What would you like to know? Determining the relative age of the sediments provides historical context for the changes observed or measured in the cores. Age also

  15. Structure in continuously cored, deep drill holes at Yucca Mountain, Nevada, with notes on calcite occurrence; Yucca Mountain Site Characterization Project

    SciTech Connect

    Carr, W.J. [Carr (Wilfred J.), Wheat Ridge, CO (United States)

    1992-12-01

    A study of more than 22,000 feet of core from five deep drill holes at Yucca Mountain, Nevada, provided data on the attitude and vertical distribution of faults and fractures, the sense of fault displacement, and the occurrence of calcite. The study was done mainly to look for evidence of fault flattening at depth, but no consistent downward decrease in dip of faults was found, and no increase in strata rotation was evident with increasing depth. In the two drill holes located near prominent faults that dip toward the holes (USW G-3 and G-2), an apparent increase in the frequency of faults occurs below the tuffs and lavas of Calico Hills. Some of this increase occurs in brittle lavas and flow breccias in the lower part of the volcanic section. In the two holes presumed to be relatively removed from the influence of important faults at depth, the vertical distribution of faults is relatively uniform. Calcite occurs mainly in two general zones, voids in welded portions of the Paintbrush Tuff, and in a deeper zone, mostly below 3,500 feet. Calcite is least abundant in USW G-4, which may reflect the fewer faults and fractures encountered in that drill hole.

  16. Teaching Marine Geoscience at Sea: Integrated Ocean Drilling Program's School of Rock Explores Cascadia Subduction Zone - Cores, Logs, and ACORKs

    Microsoft Academic Search

    M. Reagan; J. Collins; K. A. Ludwig; S. Slough; M. L. Delaney; S. A. Hovan

    2010-01-01

    For twelve days this past September, seventeen formal and informal educators from the US, UK, and France joined six instructors and a small science party on the scientific drillship JOIDES Resolution for the Integrated Ocean Drilling Program (IODP)'s Cascadia ACORK Expedition. The educators were part of the annual ``School of Rock (SOR)'' education program. SOR is coordinated by the U.S.

  17. Interpretation of Core and Well Log Physical Property Data From Drill Hole UPH-3, Stephenson County, Illinois

    Microsoft Academic Search

    Jeffrey J. Daniels; Gary R. Olhoeft; James H. Scott

    1983-01-01

    Laboratory and well log physical property measurements show variations in the mineralogy with depth in UPH-3. Gamma ray values generally decrease with depth in the drill hole, corresponding to a decrease in the felsic mineral components of the granite. Correspondingly, an increase with depth in mafic minerals in the granite is indicated by the magnetic susceptibility and gamma ray measurements.

  18. Geophysical investigations of buried Quaternary valleys in Denmark: an integrated application of transient electromagnetic soundings, reflection seismic surveys and exploratory drillings

    Microsoft Academic Search

    Flemming Jørgensen; Holger Lykke-Andersen; Peter B. E. Sandersen; Esben Auken; Egon Nørmark

    2003-01-01

    Buried Quaternary valleys are important hydrological structures in Denmark. Geophysical and geological investigations were performed to develop an integrated interpretational methodology for a quantitative description of their structure and lithology. Three buried valleys in central eastern Jutland, Denmark were investigated using the transient electromagnetic (TEM) sounding method, two-dimensional reflection seismic profiling, vertical seismic profiling (VSP) and analyses of data and

  19. Seismic velocities and anisotropy of core samples from the Chinese Continental Scientific Drilling borehole in the Sulu UHP terrane, eastern China

    NASA Astrophysics Data System (ADS)

    Sun, Shengsi; Ji, Shaocheng; Wang, Qian; Xu, Zhiqin; Salisbury, Matthew; Long, Changxing

    2012-01-01

    A detailed study of seismic properties (P and S wave velocities, hysteresis, anisotropy and shear wave splitting) has been carried out on a unique suite of deep borehole core samples from the Chinese Continental Scientific Drilling (CCSD) project, which penetrated 5158 m into the Sulu ultrahigh-pressure (UHP) metamorphic terrane (China). Seismic velocities of the deep core samples are more and less sensitive to pressure in the low pressure (<200-300 MPa) nonlinear and high pressure (>200-300 MPa) linear regimes, respectively, than samples from the surface. The comparison suggests that the high pressure data from the core samples are much more reliable for extrapolation to deeper crust than the data from surface analogs that have been subjected to long histories of weathering and alteration along intergranular and transgranular cracks. The significant increases in the pressure sensitivity of seismic velocities for the core samples in the nonlinear regime indicate that drilling-induced and stress-relief microcracks with small aspect ratios are fresh and clean without secondary mineral in-fillings, and are thus easy to close completely under the applied hydrostatic pressure conditions of the laboratory. The data also elucidate that the velocity-pressure data can successfully provide important hints about the preferred orientation of microcracks that causes P wave velocity anisotropy and shear wave splitting in cracked rocks, and that the effect of compression on the Vp/Vsratios is negligible for crack-free compacted rocks. The seismic velocities of equivalent isotropic (fabric-free) and crack-free crystalline aggregates calculated from room pressure single crystal elastic constants using the Voigt average are in good agreement with the laboratory data at ˜200 MPa. Comparison of the seismic reflection image from the vicinity of the borehole with the normal-incidence reflection coefficient profile computed from the laboratory-measured velocities and densities infers that the seismic reflections originate from mafic (eclogite and retrograde eclogite) or ultramafic units within dominantly felsic rocks.

  20. High resolution petrophysical and geomechanical logging of drill cores as a tool for the evaluation of dimension stone quality and durability

    NASA Astrophysics Data System (ADS)

    Prikryl, Richard; Lokají?ek, Tomáš; Weishauptová, Zuzana; Petružálek, Mat?j

    2015-04-01

    Petrophysical and geomechanical properties are significant functional properties of natural stone. In the recent study, an approach employing the entire non-disturb parts of drill cores for determination of the key petrophysical and geomechanical parameters is presented. The drill cores have been obtained during exploration campaign for Carboniferous arkoses and arkosic sandstones to conglomerates in the Bohemian Massif (Czech Republic). The test procedure consists of the sequence of non-destructive methods including determination of index properties, ultrasonic characteristics (speed of longitudinal and transversal waves, recording of the full waveforms). Once non-destructively tested, the specimens are subjected to standard compressive and/or tensile tests encompassing recording of stress-strain behaviour. Broad range of values obtained reflects quite complex petrographical character of rocks investigated. Variable grain size, grain size homogeneity, degree of cementation, overall rock microfabric, and/or presence and distribution of inter- and intraparticle porosity seem to be determinative factors. Once calibrated for a particular petrographical characteristics, high resolution petrophysical and geomechanical logging (HRPGL) can serve as an effective tool for precise evaluation of exploitable natural stone quality.

  1. Chemical geodynamics of continental subduction-zone metamorphism: Insights from studies of the Chinese Continental Scientific Drilling (CCSD) core samples

    NASA Astrophysics Data System (ADS)

    Zheng, Yong-Fei; Chen, Ren-Xu; Zhao, Zi-Fu

    2009-09-01

    The Dabie-Sulu orogenic belt of east-central China has long been a type location for the study of geodynamic processes associated with ultrahigh-pressure (UHP) tectonics. Much of our understanding of the world's most enigmatic processes in continental deep-subduction zones has been deduced from various records in this belt. By taking advantage of having depth profiles from core samples of the Chinese Continental Scientific Drilling (CCSD) project in the Sulu orogen, a series of combined studies were carried out for UHP metamorphic rocks from the main hole (MH) at continuous depths of 100 to 5000 m. The results provide new insights into the chemical geodynamics of continental subduction-zone metamorphism, especially on the issues that are not able to be resolved from the surface outcrops. Available results from our geochemical studies of CCSD-MH core samples can be outlined as follows. (1) An O isotope profile of 100 to 5000 m is established for the UHP metamorphic minerals, with finding of 18O depletion as deep as 3300 m. Along with areal 18O depletion of over 30,000 km 2 along the Dabie-Sulu orogenic belt, three-dimensional 18O depletion of over 100,000 km 3 occurs along the northern margin of the South China Block. (2) Changes in mineral O isotope, H isotope and water content occur in eclogite-gneiss transitions, concordant with petrographic changes. The contact between different lithologies is thus the most favorable place for fluid action; fluid for retrogression of the eclogites away from the eclogite-gneiss boundary was derived from the decompression exsolution. For the eclogites adjacent to gneiss, in contrast, the retrograde metamorphism was principally caused by aqueous fluid from the gneiss that is relatively rich in water. Inspection of the relationship between the distance, petrography and ?18O values of adjacent samples shows O isotope heterogeneities between the different and same lithologies on scales of 20 to 50 cm, corresponding to the maximum scales of fluid mobility during the continental collision. (3) Studies of major and trace elements in the two continuous core segments indicate high mobility of LILE and LREE but immobility of HFSE and HREE. Some eclogites have andesitic compositions with high SiO 2, alkalis, LREE and LILE but low CaO, MgO and FeO contents. These features likely result from chemical exchange with gneisses, possibly due to the metasomatism of felsic melt produced by partial melting of the associated gneisses during the exhumation. On the other hand, some eclogites appear to have geochemical affinity to refractory rocks formed by melt extraction as evidence by strong LREE and LILE depletion and the absence of hydrous minerals. These results provide evidence for melt-induced element mobility in the UHP metamorphic rocks, and thus the possible presence of supercritical fluid during exhumation. In particular, large variations in the abundance of such elements as SiO 2, LREE and LILE occur at the contact between eclogite and gneiss. This indicates their mobility between different slab components, although it only occurs on small scales and is thus limited in local open-systems. (4) Despite the widespread retrogression, retrograde fluid was internally buffered in stable isotope compositions, and the retrograde fluid was of deuteric origin and thus was derived from the decompression exsolution of structural hydroxyl and molecular water in nominally anhydrous minerals. (5) A combined study of petrography and geochronology reveals the episode of HP eclogite-facies recrystallization at 216 ± 3 Ma, with timescale of 1.9 to 9.3 Myr or less. Collectively, the Dabie-Sulu UHP terrenes underwent the protracted exhumation (2-3 mm/yr) in the HP-UHP regime. (6) Zircon U-Pb ages and Hf isotopes indicate that mid-Neoproterozoic protoliths of bimodal UHP metaigneous rocks formed during supercontinental rifting along preexisting arc-continent collision orogen, corresponding to dual bimodal magmatism in response to the attempted breakup of the supercontinent Rodinia at about 780 Ma. The first type of bim

  2. Nanometer quartz grains and rapid cooling melt in fault gouge during earthquake process - observed from the WFSD-1 drilling core sample

    NASA Astrophysics Data System (ADS)

    Wang, H.; Li, H.; Janssen, C.; Wirth, R.

    2014-12-01

    Drilling into active faults is an effective way to get data and materials at depth that help to understand the material properties, physical mechanisms and healing processes of the faults. The Wenchuan earthquake fault scientific drilling project (WFSD) was conducted immediately after the 2008 Wenchuan earthquake (Mw 7.9). The first borehole of the project (WFSD-1) penetrates the Yingxiu-Beichuan fault with a final depth of 1201.15 m and meet the principal slip zone (PSZ) of Wenchuan earthquake at depth of 589.2 m. About 183.3 m-thick fault rocks are recognized in the WFSD-1 drilling core from 575.7 to 759 m-depth, which was confirmed as the Yingxiu-Beichuan fault zone with a real thickness of about 100 m due to the borehole inclination of 11°. In this research we got samples from WFSD-1 drilling core at the depth of 732.4-732.8 m, in which black gouge, gray gouge, fine-grained fault breccia and coarse-grained fault breccia layers can be distinguished clearly. Slickensides were developed in the surface of the black gouge layer. The protolith of this segment is sandstone. Based on detailed microstructural analysis using electron optical microscope, scanning electron microscope (SEM) and transmission electron microscope (TEM). An about 1 mm-thick amorphous material layer containing small quartz grains was observed. Circles with different densities were observed in the amorphous material indicate a melt-origin. Cracks are developed in the amorphous material, which are suggested to be caused by general volume reduction as a result of rapid cooling contraction. TEM-EDX analysis of the amorphous material indicates mainly feldspar composition, implying the melting temperature was >1230?, while quartz grains did not melt indicating a temperature <1700?. Nano-scale quartz grains were observed in a very small layer showing a different structure at the edge of the amorphous layer, indicating that nano quartz grains were formed by the comminution during earthquake, which is very important in earthquake energy budgets calculation. These microstructural analysis results reveal that the amorphous layer may formed by rapid cooling of the frictional melt material caused by high-velocity slip during a large earthquake, and fluid flow may played an important role in the rapid cooling process.

  3. Iron-oxide Magnetic, Morphologic, and Compositional Tracers of Sediment Provenance and Ice Sheet Extent in the ANDRILL AND-1B Drill Core, Ross Sea, Antarctica (Invited)

    NASA Astrophysics Data System (ADS)

    Brachfeld, S. A.; Pinzon, J.; Darley, J. S.; Sagnotti, L.; Kuhn, G.; Florindo, F.; Wilson, G. S.; Ohneiser, C.; Monien, D.; Joseph, L. H.

    2013-12-01

    The first drilling season of the Antarctic Drilling Program (ANDRILL) recovered a 13.57 million year Miocene through Pleistocene record of paleoclimate change (core AND-1B) within the Ross Sea. The magnetic mineral assemblage records the varying contributions of biological productivity, changing sediment sources, the emergence of volcanic centers, and post-depositional diagenesis. Characterization of bedrock samples from the McMurdo Volcanic Group (MVG) and Transantarctic Mountain (TAM) lithologic units allows us to construct fingerprints for the major source rocks bordering the Ross Sea, and identify their signatures within the AND-1B sediment. Key parameters that can be traced from source rock to sediment for the MVG-derived sediment include a 100-200 C order-disorder transition, titanomaghemite grains with homogenous textures but with substantial Al and Mg content, Fe-spinels with substantial Al, Cr, Mg, and Ti content, and titanomagnetite host grains with 1-3 swarms of ilmenite lamellae (both with variable amounts of oxidation). Distinctive signatures in TAM lithologies include low S-ratios in Koettlitz Group gneisses and Fe-sulfides with magnetite intergrowths in Byrd Glacier basement samples. The Cambrian Granite Harbor Intrusive Complex is characterized by coarse, homogeneous Mn-bearing ilmenite and nearly pure magnetite. The Jurassic dolerites and basalts of the Ferrar Group contain pseudo single domain to stable single domain-sized Fe-oxides with low-Ti content and homogeneous textures. Cu-Fe sulfides are also present in the Ferrar Group. Diamictites in the Pliocene-Pleistocene section of the AND-1B drill core contains Fe-oxide assemblages with MVG-type rock magnetic and textural characteristics, while the Miocene diamictites contain TAM-type signatures. These observations can be explained by increased ice flow from the west during the Miocene and/or the absence of MVG volcanic centers, which had not yet reached a significant size. During the Pliocene and Pleistocene, ice flow was from the south, entraining sediment from MVG volcanic centers south of the drill site. This work demonstrates the utility of using the combination of rock magnetic and electron microscopy signatures of Fe-oxides and Fe-sulfides to serve as provenance tracers in both ice proximal and distal sedimentary units, aiding in the study of ice sheet dynamics, and the identification of ice rafted debris sources and dispersal patterns in the Ross Sea sector of Antarctica.

  4. Geohydrologic and drill-hole data for test well USW H-1, adjacent to Nevada Test Site, Nye County, Nevada

    USGS Publications Warehouse

    Rush, F. Eugene; Thordarson, William; Bruckheimer, Laura

    1983-01-01

    This report presents data collected to determine the hydraulic characteristics of rocks penetrated in test well USW H-1. The well is one of a series of test wells drilled in and near the southwestern part of the Nevada Test Site, Nye County, Nevada, in a program conducted on behalf of the U.S. Department of Energy. These investigations are part of the Nevada Nuclear Waste Storage Investigations to identify suitable sites for storage of high-level radioactive wastes. Data on drilling operations, lithology, borehole geophysics, hydrologic monitoring, core analysis, ground-water chemistry and pumping and injection tests for well USW H-1 are contained in this report.

  5. OCEAN DRILLING PROGRAM LEG 186 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 186 SCIENTIFIC PROSPECTUS WESTERN PACIFIC GEOPHYSICAL OBSERVATORIES Dr-Chief Scientist Ocean Research Institute The University of Tokyo 1-15-1 Minamidai Tokyo 164-8639, Japan Dr. Gary D. Acton Staff Scientist Ocean Drilling Program Texas A&M University Research Park 1000 Discovery Drive

  6. 3D gravity modelling of the Scandinavian Caledonides in the vicinity of COSC-1 drill site constrained by petrophysical data from the drill core

    NASA Astrophysics Data System (ADS)

    Berthet, Théo; Almqvist, Bjarne; Hedin, Peter; Juhlin, Christopher; Gee, David G.; Malehmir, Alireza; Lorenz, Henning

    2015-04-01

    The Scandinavian Caledonides have long been recognised to have been part of a Paleozoic mountain belt of Alpine-Himalayan dimensions. Today, the remnants of the Scandinavian Caledonides extend laterally over ca. 1500 km and show east-vergent thrusting and emplacement of allochthons in Norway and western Sweden. The middle allochton (Seve nappe complex), characterized by an inverted metamorphic gradient and partially molten parts that were involved in ductile extrusion, provides opportunities to investigate deep mountain building processes currently occurring in the Himalaya-Tibet orogen. Moreover the recent discovery of a subduction related ultra-high pressure terrane in the upper part of the middle allochton raises more questions about the process of emplacement of this continental slice during orogeny (Majka et al., 2014). Investigating crustal structure in the vicinity of the COSC-1 area is of key importance in understanding the extrusion process. In this study, we use a combination of new and pre-existing terrestrial gravity data to image the high-density middle allochton and its structural relation to the underlying units. Compared to previous work (Hedin et al., 2013), we use free-air anomaly data instead of the Bouguer anomalies (and the standard correction of 2670 kg/m3) because the near surface-density distribution has a significant influence on the gravity signal in this area of high relief. The topography and its density variations are thus incorporated in the 3D gravity model of the area. We also take advantage of the density measurements from both the 2.5 km recovered core material and borehole logging to calibrate the upper part of our model, as well as new seismic data to better constrain the location and shape of the main tectonic limits. Our constrained 3D gravity modelling thus improves the structural image of the western Jämtland area, especially the high-density anisotropic middle allochton that is underlain by the by lower density lower allochton.

  7. Identification and Characterization of Hydrogeologic Units at the Nevada Test Site Using Geophysical Logs: Examples from the Underground Test Area Project

    SciTech Connect

    Lance Prothro, Sigmund Drellack, Margaret Townsend

    2009-03-25

    The diverse and complex geology of the Nevada Test Site region makes for a challenging environment for identifying and characterizing hydrogeologic units penetrated by wells drilled for the U.S. Department of Energy, National Nuclear Security Administration, Underground Test Area (UGTA) Environmental Restoration Sub-Project. Fortunately, UGTA geoscientists have access to large and robust sets of subsurface geologic data, as well as a large historical knowledge base of subsurface geological analyses acquired mainly during the underground nuclear weapons testing program. Of particular importance to the accurate identification and characterization of hydrogeologic units in UGTA boreholes are the data and interpretation principles associated with geophysical well logs. Although most UGTA participants and stakeholders are probably familiar with drill hole data such as drill core and cuttings, they may be less familiar with the use of geophysical logs; this document is meant to serve as a primer on the use of geophysical logs in the UGTA project. Standard geophysical logging tools used in the UGTA project to identify and characterize hydrogeologic units are described, and basic interpretation principles and techniques are explained. Numerous examples of geophysical log data from a variety of hydrogeologic units encountered in UGTA wells are presented to highlight the use and value of geophysical logs in the accurate hydrogeologic characterization of UGTA wells.

  8. Drilling gas hydrates with the sea floor drill rig MARUM-MeBo

    NASA Astrophysics Data System (ADS)

    Freudenthal, Tim; Bohrmann, Gerhard; Wefer, Gerold

    2015-04-01

    Large amounts of methane are bound in marine gas hydrate deposits. Local conditions like pressure, temperature, gas and pore water compositions define the boundaries of gas hydrate stability within the ocean sediments. Depending on those conditions gas hydrates can occur within marine sediments at depth down to several hundreds of meters up to sea floor. These oceanic methane deposits are widespread along continental margins. By forming cement in otherwise soft sediments gas hydrates are stabilizing the seafloor on continental slopes. Drilling operations are required for understanding the distribution of gas hydrates as well as for sampling them to study the composition, microstructure and its geomechanical and geophysical properties. The sea floor drill rig MARUM-MeBo200 has the capability to drill down to 200 m below sea floor well within the depth of major gas hydrate occurrences at continental margins. This drill rig is a transportable sea floor drill rig that can be deployed from a variety of multi-purpose research vessels. It is deployed on the sea bed and controlled from the vessel. It is the second generation MeBo (Freudenthal and Wefer, 2013) and was developed from 2011 to 2014 by MARUM in cooperation with BAUER Maschinen GmbH. Long term experiences with the first generation MeBo70 that was operated since 2005 on 15 research expeditions largely contributed to the development of MeBo200. It was first tested in October 2014 from the research vessel RV SONNE in the North Sea. In this presentation the suitability of MARUM-MeBo for drilling marine gas hydrates is discussed. We report on experiences drilling gas hydrates on two research expeditions with MeBo70. A research expedition for sampling gas hydrates in the Danube Paleodelta with MeBo200 as well as technical developments for improving the suitability of MeBo for gas hydrate exploration works are planned within the project SUGAR3 funded by the Federal Government for Economy and Energy (BMWi). Freudenthal, T and Wefer, G (2013) Drilling cores on the sea floor with the remote-controlled sea floor drilling rig MeBo. Geoscientific Instrumentation, Methods and Data Systems, 2(2). 329-337. doi:10.5194/gi-2-329-2013

  9. Core lithology, Valles caldera No. 1, New Mexico

    SciTech Connect

    Gardner, J.N.; Goff, F.; Goff, S.; Maassen, L.; Mathews, K.; Wachs, D.; Wilson, D.

    1987-04-01

    Vallas caldera No. 1 (VC-1) is the first Continental Scientific Drilling Program research core hole in the Vallas caldera and the first continuously cored hole in the region. The hole penetrated 298 m of moat volcanics and caldera-fill ignimbrites, 35 m of volcaniclastic breccia, and 523 m of Paleozoic carbonates, sandstones, and shales with over 95% core recovery. The primary research objectives included coring through the youngest rhyolite flow within the caldera; obtaining structural and stratigraphic information near the intersection of the ring-fracture zone and the pre-caldera Jemez fault zone; and penetrating a high-temperature hydrothermal outflow plume near its source. This report presents a compilation of lithologic and geophysical logs and photographs of core that were collected while drilling VC-1. It is intended to be a reference tool for researchers interested in caldera processes and associated geologic phenomena.

  10. Drilling the Waqf as Suwwan impact structure

    NASA Astrophysics Data System (ADS)

    Salameh, E.; Khoury, H.; Reimold, W. U.

    2014-01-01

    The about 6-km diameter, near-circular Waqf as Suwwan structure located at E36°48'/N31°03' in eastern Jordan was only recently recognized as a somewhat eroded, complex impact structure. Surface geological mapping, geophysical interpretation, remote sensing, and petrographic and mineralogical analyses have been carried out to understand the structure. In particular, the complex geology of the remnant of the central uplift has been scrutinized. A recent drilling project afforded an opportunity to expand the investigation of the structure to previously inaccessible strata of the ring syncline in the environs of the central uplift. Three boreholes were drilled, two to 140 and 110 m depth to the north and outside of the central uplift, and a further short hole to 5 m depth into the innermost part of the central uplift. Preliminary assessment of these cores has revealed the presence of around 11 m of fluvial breccias (wadi deposit) that are dominated by chert fragments at the top of the syncline fill. This is underlain by a normal succession of late Maastrichtian to Campanian strata. A variety of microstructures such as fracturing with vertical, as well as inclined at 45° and 30° fractures occurs throughout the cores. Some joints have slickensides along their walls. Limestone and marly limestone constitute the most abundant rocks in the boreholes. Distinct shock deformation effects are entirely lacking in the cores from the syncline. These observations are interpreted as a result of substantial erosion of the impact structure down to a level within the crater floor. The microstructures and the preliminary results of the analyses of sediment ages, textures, and compositions (nanofossils and sediment mineralogy) show that sediments as old as Campanian and as young as late Maastrichtian were affected by the impact. Unfortunately, the drilling did not expose any lithologies such as impact melt breccias that could lend themselves to absolute chronological analysis for a better constraint of the impact age.

  11. Petrology of impactites from El'gygytgyn crater: Breccias in ICDP-drill core 1C, glassy impact melt rocks and spherules

    NASA Astrophysics Data System (ADS)

    Wittmann, Axel; Goderis, Steven; Claeys, Philippe; Vanhaecke, Frank; Deutsch, Alexander; Adolph, Leonie

    2013-07-01

    AbstractEl'gygytgyn is a 18 km diameter, 3.6 Ma old impact crater in NE Siberia. International Continental Scientific <span class="hlt">Drilling</span> Program—El'gygytgyn hole 1C was <span class="hlt">drilled</span> on the frozen crater lake, 2.3 km from the crater center to a final depth of 517 m below the lake floor. Petrographic and geochemical analyses of 26 <span class="hlt">drill</span> <span class="hlt">core</span> samples, three impact melt rocks from the surface, and seven glass spherules from surface deposits outside the crater are used to characterize the impactite inventory at El'gygytgyn. The bottom 98 m of hole 1C intersected monomict brecciated, unshocked, rhyolitic ignimbrite with minor intercalations of polymict breccia and mafic inclusions. These lithologies are overlain by 89 m of polymict breccia whose components occasionally exhibit scarce, low-degree shock metamorphic features. This unit is succeeded by 10 m of suevite that contains about 1 vol% glassy impact melt shards <1 cm in size and a low amount of shock metamorphosed lithic clasts. The suevite is capped by a reworked fallout deposit that constitutes a transition over 4 m into lacustrine sedimentation. A higher abundance of shock metamorphosed lithic clasts, and glass spherules, some with Ni-rich spinel and admixture of an ultramafic component, characterize this unit. We tentatively interpret this impactite section as allochthonous breccia in the vicinity of El'gygytgyn's central ring uplift. The geochemical compositions of seven glass spherules from terrace deposits 2 km outside the crater and eight spherules from the reworked fallout deposit in hole 1C show far greater variability than the composition of impact melt shards and impact melt rocks. Some of these spherules also show strong enrichments in siderophile elements.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://hdl.handle.net/2060/20100011115"><span id="translatedtitle">Rapid and Quiet <span class="hlt">Drill</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Sherrit, Stewart; Badescu, Mircea; Bar-Cohen, Yoseph; Chang, Zensheu; Bao, Xiaoqi</p> <p>2007-01-01</p> <p>This describes aspects of the rapid and quiet <span class="hlt">drill</span> (RAQD), which is a prototype apparatus for <span class="hlt">drilling</span> concrete or bricks. The design and basic principle of operation of the RAQD overlap, in several respects, with those of ultrasonic/ sonic <span class="hlt">drilling</span> and <span class="hlt">coring</span> apparatuses described in a number of previous NASA Tech Briefs articles. The main difference is that whereas the actuation scheme of the prior apparatuses is partly ultrasonic and partly sonic, the actuation scheme of the RAQD is purely ultrasonic. Hence, even though the RAQD generates considerable sound, it is characterized as quiet because most or all of the sound is above the frequency range of human hearing.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/266700"><span id="translatedtitle">Geochemistry of <span class="hlt">core</span> samples of the Tiva Canyon Tuff from <span class="hlt">drill</span> hole UE-25 NRG{number_sign}3, Yucca Mountain, Nevada</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Peterman, Z.E.; Futa, K.</p> <p>1996-07-01</p> <p>The Tiva Canyon Tuff of Miocene age is composed of crystal-poor, high-silica rhyolite overlain by a crystal-rich zone that is gradational in composition from high-silica rhyolite to quartz latite. Each of these zones is divided into subzones that have distinctive physical, mineralogical, and geochemical features.Accurate identification of these subzones and their contacts is essential for detailed mapping and correlation both at the surface and in the subsurface in <span class="hlt">drill</span> holes and in the exploratory studies facility (ESF). This report presents analyses of potassium (K), calcium (Ca), titanium (Ti), rubidium (Rb), strontium (Sr), yttrium (Y), zirconium (Zr), niobium (Nb), barium (Ba), lanthanum (La), and cerium (Ce) in <span class="hlt">core</span> samples of the Tiva Canyon Tuff from <span class="hlt">drill</span> hole UE-25 NRG {number_sign}3. The concentrations of most of these elements are remarkably constant throughout the high-silica rhyolite, but at its upper contact with the crystal-rich zone, Ti, Zr, Ba, Ca, Sr, La, Ce, and K begin to increase progressively through the crystal-rich zone. In contrast, Rb and Nb decrease, and Y remains essentially constant. Initial {sup 87}Sr/{sup 86}Sr ratios are relatively uniform in the high-silica rhyolite with a mean value of 0.7117, whereas initial {sup 87}Sr/{sup 86}Sr ratios decrease upward in the quartz latite to values as low as 0.7090.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2014M%26PS...49..394L"><span id="translatedtitle">10Be content in clasts from fallout suevitic breccia in <span class="hlt">drill</span> <span class="hlt">cores</span> from the Bosumtwi impact crater, Ghana: Clues to preimpact target distribution</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Losiak, Anna; Wild, Eva Maria; Michlmayr, Leonard; Koeberl, Christian</p> <p>2014-03-01</p> <p>Rocks from <span class="hlt">drill</span> <span class="hlt">cores</span> LB-07A (crater fill) and LB-08A (central uplift) into the Bosumtwi impact crater, Ghana, were analyzed for the presence of the cosmogenic radionuclide 10Be. The aim of the study was to determine the extent to which target rocks of various depths were mixed during the formation of the crater-filling breccia, and also to detect meteoric water infiltration within the impactite layer. 10Be abundances above background were found in two (out of 24) samples from the LB-07A <span class="hlt">core</span>, and in none of five samples from the LB-08A <span class="hlt">core</span>. After excluding other possible explanations for an elevated 10Be signal, we conclude that it is most probably due to a preimpact origin of those clasts from target rocks close to the surface. Our results suggest that in-crater breccias were well mixed during the impact cratering process. In addition, the lack of a 10Be signal within the rocks located very close to the lake sediment-impactite boundary suggests that infiltration of meteoric water below the postimpact crater floor was limited. This may suggest that the infiltration of the meteoric water within the crater takes place not through the aerial pore-space, but rather through a localized system of fractures.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/70016006"><span id="translatedtitle">Production of sulfur gases and carbon dioxide by synthetic weathering of crushed <span class="hlt">drill</span> <span class="hlt">cores</span> from the Santa Cruz porphyry copper deposit near Casa Grande, Pinal County, Arizona</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Hinkle, M.E.; Ryder, J.L.; Sutley, S.J.; Botinelly, T.</p> <p>1990-01-01</p> <p>Samples of ground <span class="hlt">drill</span> <span class="hlt">cores</span> from the southern part of the Santa Cruz porphyry copper deposit, Casa Grande, Arizona, were oxidized in simulated weathering experiments. The samples were also separated into various mineral fractions and analyzed for contents of metals and sulfide minerals. The principal sulfide mineral present was pyrite. Gases produced in the weathering experiments were measured by gas chromatography. Carbon dioxide, oxygen, carbonyl sulfide, sulfur dioxide and carbon disulfide were found in the gases; no hydrogen sulfide, organic sulfides, or mercaptans were detected. Oxygen concentration was very important for production of the volatiles measured; in general, oxygen concentration was more important to gas production than were metallic element content, sulfide mineral content, or mineral fraction (oxide or sulfide) of the sample. The various volatile species also appeared to be interactive; some of the volatiles measured may have been formed through gas reactions. ?? 1990.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6970158"><span id="translatedtitle">Petrology and hydrothermal mineralogy of U. S. Geological Survey Newberry 2 <span class="hlt">drill</span> <span class="hlt">core</span> from Newberry caldera, Oregon</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Keith, T.E.C.; Bargar, K.E.</p> <p>1988-09-10</p> <p>U.S. Geological Survey Newberry 2 was <span class="hlt">drilled</span> to a depth of 932 m within Newberry caldera. The bottom-hole temperature of 265/sup 0/C is the highest reported temperature of any <span class="hlt">drill</span> hole in the Cascades region of the United States. The upper part of the stratigraphic section pentrated by Newberry 2 consists of caldera fill below which are increasingly more mafic lavas ranging from rhyodacite at 501 m to basalt at 932 m. Measured temperatures shallower than 300 m are less than 35/sup 0/C, and rock alteration consists of hydration of glass and local palagonitization of basaltic tuffs. Incipient zeolitization and partial smectite replacement of ash and pumice occurred throughout the pumiceous lithic tuffs from 300 to 500 m. Higher-temperature alteration of the tuffs to chlorite and mordenite occurs adjacent to a rhyodacite sill at 460--470 m; alteration minerals within the sill consist of pyrrhotite, pyrite, quartz, calcite, and siderite. Below 697 m the rocks are progressively more altered with depth mainly because of increased temperature along a conductive gradient from 100/sup 0/C at 697 m to 265/sup 0/C at 930 m. Fluid inclusions in quartz and calcite indicate that temperature in the past have been higher than at present, most likely due to local confining pressures between impermeable lava flows.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2006AGUFMIN11A1150R"><span id="translatedtitle">Automated Classification and Correlation of <span class="hlt">Drill</span> <span class="hlt">Cores</span> using High-Resolution Hyperspectral Images and Supervised Pattern Classification Algorithms. Applications to Paleoseismology</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ragona, D. E.; Minster, B.; Rockwell, T.; Jasso, H.</p> <p>2006-12-01</p> <p>The standard methodology to describe, classify and correlate geologic materials in the field or lab rely on physical inspection of samples, sometimes with the assistance of conventional analytical techniques (e. g. XRD, microscopy, particle size analysis). This is commonly both time-consuming and inherently subjective. Many geological materials share identical visible properties (e.g. fine grained materials, alteration minerals) and therefore cannot be mapped using the human eye alone. Recent investigations have shown that ground- based hyperspectral imaging provides an effective method to study and digitally store stratigraphic and structural data from <span class="hlt">cores</span> or field exposures. Neural networks and Naive Bayesian classifiers supply a variety of well-established techniques towards pattern recognition, especially for data examples with high- dimensionality input-outputs. In this poster, we present a new methodology for automatic mapping of sedimentary stratigraphy in the lab (<span class="hlt">drill</span> <span class="hlt">cores</span>, samples) or the field (outcrops, exposures) using short wave infrared (SWIR) hyperspectral images and these two supervised classification algorithms. High-spatial/spectral resolution data from large sediment samples (<span class="hlt">drill</span> <span class="hlt">cores</span>) from a paleoseismic excavation site were collected using a portable hyperspectral scanner with 245 continuous channels measured across the 960 to 2404 nm spectral range. The data were corrected for geometric and radiometric distortions and pre-processed to obtain reflectance at each pixel of the images. We built an example set using hundreds of reflectance spectra collected from the sediment <span class="hlt">core</span> images. The examples were grouped into eight classes corresponding to materials found in the samples. We constructed two additional example sets by computing the 2-norm normalization, the derivative of the smoothed original reflectance examples. Each example set was divided into four subsets: training, training test, verification and validation. A multi-layer perceptron with variable architecture and a Naive Bayesian classifier were trained to construct the classification models. Then, we computed the classification accuracy of our models using the validation sets. For the original reflectance set, our best model achieved a 98.4 % classification accuracy. The 2-norm normalized reflectance training set produced 97 % classification accuracy and the derivatives training sets generated models with 97 % (every point derivative) and 97.6 % (every five points derivative) classification accuracy. The outputs of the best model were used to classify the <span class="hlt">core</span> images. We generated classification images of all the samples and compared them against the real samples for an ultimate qualitative verification of the classification. The results of this work show that reflectance spectra combined with neural networks or Naive Bayesian classifieres can be used to properly discern and classify sediments of very similar composition and grain size. Quantitative identification of geological materials can be used as a fast and objective method to describe samples, <span class="hlt">drill</span> <span class="hlt">cores</span>, trench exposures and outcrops.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/70047525"><span id="translatedtitle">Correction to “Constraints on the stress state of the San Andreas Fault with analysis based on <span class="hlt">core</span> and cuttings from San Andreas Fault Observatory at Depth (SAFOD) <span class="hlt">drilling</span> phases 1 and 2”</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Tembe, Sheryl; Lockner, David; Wong, Teng-Fong</p> <p>2010-01-01</p> <p>This article corrects: Constraints on the stress state of the San Andreas Fault with analysis based on <span class="hlt">core</span> and cuttings from San Andreas Fault Observatory at Depth (SAFOD) <span class="hlt">drilling</span> phases 1 and 2. Vol. 114, Issue B11, Article first published online: 5 NOV 2009.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2014AGUFM.V43D4918D"><span id="translatedtitle">Petrography of sandstones from <span class="hlt">drill</span> <span class="hlt">cores</span> BARB4 and BARB5, Paleoarchean Mapepe Formation, Barberton greenstone belt, South Africa: Implications for provenance and tectonic reconstructions.</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Drabon, N.; Lowe, D. R.; Heubeck, C. E.</p> <p>2014-12-01</p> <p>Paleogeographic and tectonic reconstructions in the Barberton greenstone belt (BGB) are challenged by syn- and post-depositional tectonics. The Barberton <span class="hlt">Drilling</span> Project extracted two <span class="hlt">drill</span> <span class="hlt">cores</span> from the sedimentary rocks of the 3.26-3.22 Ga Mapepe Formation of the Fig Tree Group. The <span class="hlt">cores</span> were taken from the Manzimnyama Syncline (BARB4) and the Barite Valley structural belt (BARB5), which are separated by belts of faulted older Onverwacht and younger Moodies strata. Stratigraphically, there is no clear correlation of Mapape strata in these two belts. Both BARB4 and BARB5 contain 25 to 300 m thick units of lithic sandstone that may represent correlative units. A comparative provenance analysis allows testing a possible correlation and evaluating the nature of tectonic uplifts that sourced the sediments. The sandstones have experienced pervasive metasomatic alteration and most primary silicate minerals except coarse quartz have been transformed into micromosaics of microquartz, phyllosilicates, and trace impurities. The majority of framework grains are chert, impure chert, and lithic grains while monocrystalline quartz and altered feldspar are minor components. The single thick sandstone in BARB4 displays a relatively uniform framework mode with average 38.7 % total quartz, 2.4% feldspars, and 58.9 % lithics and an increasing percentage of mafic to ultramafic grains upsection. In contrast, BARB5 includes three distinct sandstones with varying framework modes. The litharenite at 0 to 95m <span class="hlt">core</span> depth was mainly sourced from an immediately underlying dacitic tuff. The chertarenite at 320 to 390m <span class="hlt">core</span> depth is composed of 73% carbonaceous chert grains. All grain types appear to have been derived by erosion of sedimentary and volcanic rocks of the BGB as well as penecontemporaneous volcanism. Erosion did not reach deeper-seated plutonic rocks. The framework mode of the BARB4 sandstones represents a composite of common silicified BGB rocks and resembles those of other sediments in the southern domain of the BGB. In contrast, BARB5 sandstones derived locally by shallow erosion of underlying volcanic and sedimentary rocks. The distinct signatures suggest that these units are not correlative and were not derived from a common source. They may be a result of local uplifts of different parts of the greenstone sequence.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2014AGUFM.V54A..05E"><span id="translatedtitle">Direct Observation of Rhyolite Magma by <span class="hlt">Drilling</span>: The Proposed Krafla Magma <span class="hlt">Drilling</span> Project</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Eichelberger, J. C.; Sigmundsson, F.; Papale, P.; Markusson, S.; Loughlin, S.</p> <p>2014-12-01</p> <p>Remarkably, <span class="hlt">drilling</span> in Landsvirkjun Co.'s geothermal field in Krafla Caldera, Iceland has encountered rhyolite magma or hypersolidus rhyolite at 2.1-2.5 km depth in 3 wells distributed over 3.5 km2, including Iceland Deep <span class="hlt">Drilling</span> Program's IDDP-1 (Mortensen, 2012). Krafla's most recent rifting and eruption (basalt) episode was 1975-1984; deformation since that time has been simple decay. Apparently rhyolite magma was either emplaced during that episode without itself erupting or quietly evolved in situ within 2-3 decades. Analysis of <span class="hlt">drill</span> cuttings containing quenched melt from IDDP-1 yielded unprecedented petrologic data (Zierenberg et al, 2012). But interpreting active processes of heat and mass transfer requires knowing spatial variations in physical and chemical characteristics at the margin of the magma body, and that requires retrieving <span class="hlt">core</span> - a not-inconceivable task. <span class="hlt">Core</span> quenched in situ in melt up to 1150oC was recovered from Kilauea Iki lava lake, Hawaii by the Magma Energy Project >30 years ago. The site from which IDDP-1 was <span class="hlt">drilled</span>, and perhaps IDDP-1 itself, may be available to attempt the first-ever <span class="hlt">coring</span> of rhyolite magma, now proposed as the Krafla Magma <span class="hlt">Drilling</span> Project (KMDP). KMDP would also include <span class="hlt">geophysical</span> and geochemical experiments to measure the response of the magma/hydrothermal system to fluid injection and flow tests. Fundamental results will reveal the behavior of magma in the upper crust and coupling between magma and the hydrothermal system. Extreme, sustained thermal power output during flow tests of IDDP-1 suggests operation of a Kilauea-Iki-like freeze-fracture-flow boundary propagating into the magma and mining its latent heat of crystallization (Carrigan et al, EGU, 2014). Such an ultra-hot Enhanced Geothermal System (EGS) might be developable beneath this and other magma-heated conventional hydrothermal systems. Additionally, intra-caldera intrusions like Krafla's are believed to produce the unrest that is so troubling in populated calderas (e.g., Campi Flegrei, Italy). Experiments with the live system will aid in hazard assessment and eruption forecasting for this most difficult of volcano hazard problems. We will report on an International Continental Scientific <span class="hlt">Drilling</span> Program (ICDP) workshop held to assess feasibility and to develop a plan for KMDP.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li class="active"><span>10</span></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_10 --> <div id="page_11" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li class="active"><span>11</span></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="201"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=19750054653&hterms=steroids&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D50%26Ntt%3Dsteroids"><span id="translatedtitle">Study of the organic matter in the DSDP /JOIDES/ <span class="hlt">cores</span>, legs 10-15. [Deep Sea <span class="hlt">Drilling</span> Program</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Simoneit, B. R. T.; Burlingame, A. L.</p> <p>1974-01-01</p> <p>The composition of the organic matter collected on legs 10 to 15 of the DSDP (Deep Sea <span class="hlt">Drilling</span> Project) is described. Distributions of various alkanes, carboxylic acids, steroids and terpenoids, isoprenoid ketones and olefins, and aromatic polycyclic compounds are given. Samples analyzed had terrigenous clay components, with variable organic carbon contents and thus diverse solvent soluble matter. The distribution patterns for the various compound series monitored were of marine derivation, with the terrigenous components superimposed. Diagenesis of steroids appeared to proceed via both stanones and stanols to their respective steranes. Degradative processes were observed to be operative: oxidative products, mainly ketones derived from steroids and phytol, were identified, probably due to microbial alteration prior to or during sedimentation. Loss of alkane and fatty acid C preferences and presence of polycyclic aromatics evinced maturation. Results indicate that the accumulation, degradation, diagenesis and maturation of organic matter occurs in various steps in the deep sea environment.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NSDL&redirectUrl=http://www.sciencenewsforkids.org/2004/08/deep-drilling-at-sea-2/"><span id="translatedtitle">Deep <span class="hlt">Drilling</span> at Sea</span></a></p> <p><a target="_blank" href="http://nsdl.org/nsdl_dds/services/ddsws1-1/service_explorer.jsp">NSDL National Science Digital Library</a></p> <p>Kate Ramsayer</p> <p></p> <p>This Science News for Kids article provides an image-rich overview of a deep-sea <span class="hlt">drilling</span> project off the coast of British Columbia. The article guides students through the exploration, explaining how deep sediment <span class="hlt">cores</span> are taken, what researchers find in the <span class="hlt">cores</span>, and details of what life is like on a research ship. It features links to an online poll, an opportunity for students to submit comments, a deep-sea <span class="hlt">drilling</span> word find, and links to supplementary reading questions and related sites.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2009AGUFMED24A..01S"><span id="translatedtitle">‘Building <span class="hlt">Core</span> Knowledge - Reconstructing Earth History’: Transforming Undergraduate Instruction by Bringing Ocean <span class="hlt">Drilling</span> Science on Earth History and Global Climate Change into the Classroom (Invited)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>St. John, K.; Leckie, R. M.; Jones, M. H.; Pound, K. S.; Pyle, E.; Krissek, L. A.</p> <p>2009-12-01</p> <p>This NSF-funded, Phase 1 CCLI project effectively integrates scientific ocean <span class="hlt">drilling</span> data and research (DSDP-ODP-IODP-ANDRILL) with education. We have developed, and are currently testing, a suite of data-rich inquiry-based classroom learning materials based on sediment <span class="hlt">core</span> archives. These materials are suitable for use in introductory geoscience courses that serve general education students, early geoscience majors, and pre-service teachers. 'Science made accessible' is the essence of this goal. Our team consists of research and education specialists from institutions ranging from R1 research to public liberal arts to community college. We address relevant and timely ‘Big Ideas’ with foundational geoscience concepts and climate change case studies, as well transferable skills valued in professional settings. The exercises are divided into separate but inter-related modules including: introduction to <span class="hlt">cores</span>, seafloor sediments, microfossils and biostratigraphy, paleomagnetism and magnetostratigraphy, climate rhythms, oxygen-isotope changes in the Cenozoic, past Arctic and Antarctic climates, <span class="hlt">drill</span> site selection, interpreting Arctic and Antarctic sediment <span class="hlt">cores</span>, onset of Northern Hemisphere glaciation, onset of Antarctic glaciation, and the Paleocene-Eocene Thermal Maximum. Each module has several parts, and each is designed to be used in the classroom, laboratory, or assigned as homework. All exercises utilize authentic data. Students work with scientific uncertainty, practice quantitative and problem-solving skills, and expand their basic geologic and geographic knowledge. Students have the opportunity to work individually and in groups, evaluate real-world problems, and formulate hypotheses. Initial exercises in each module are useful to introduce a topic, gauge prior knowledge, and flag possible areas of student misconception. Comprehensive instructor guides provide essential background information, detailed answer keys, and alternative implementation strategies, as well as providing links to other supplementary materials and examples for assessment. Preliminary assessment data indicates positive gains in student attitudes towards science, and in their content knowledge and scientific skills. In addition, student outcomes appear to depend somewhat on students’ motivation for taking the course and their institution, but are generally independent of students’ class rank or GPA. Our classroom-tested learning materials are being disseminated through a variety of outlets including instructor workshops and eventually to the web.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=20030005005&hterms=oil+drill&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Doil%2Bdrill"><span id="translatedtitle">Sub-Ocean <span class="hlt">Drilling</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p></p> <p>1981-01-01</p> <p>The National Science Foundation (NSF) initialized a new phase of exploration last year, a 10 year effort jointly funded by NSF and several major oil companies, known as the Ocean Margin <span class="hlt">Drilling</span> Program (OMDP). The OMDP requires a ship with capabilities beyond existing <span class="hlt">drill</span> ships; it must <span class="hlt">drill</span> in 13,000 feet of water to a depth 20,000 feet below the ocean floor. To meet requirements, NSF is considering the conversion of the government-owned mining ship Glomar Explorer to a deep ocean <span class="hlt">drilling</span> and <span class="hlt">coring</span> vessel. Feasibility study performed by Donhaiser Marine, Inc. analyzed the ship's characteristics for suitability and evaluated conversion requirement. DMI utilized COSMIC's Ship Motion and Sea Load Computer program to perform analysis which could not be accomplished by other means. If approved for conversion, Glomar Explorer is expected to begin operations as a drillship in 1984.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2009AGUFMNH31A1100H"><span id="translatedtitle">Structural geology of cuttings and <span class="hlt">cores</span> recovered from below the Kumano forearc basin, Nankai accretionary margin of Japan: Expedition 319 of the Integrated Ocean <span class="hlt">Drilling</span> Program (IODP)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hayman, N. W.; Byrne, T. B.; Huftile, G.; McNeill, L. C.; Kanamatsu, T.; Saffer, D.; Araki, E.; Eguchi, N. O.; Toczko, S.; Takahashi, K.; Scientists, E.</p> <p>2009-12-01</p> <p>The geologic materials below the Kumano Basin provide critical information for understanding the geologic evolution of Japan’s Nankai margin and its earthquake hazards. Riser-based <span class="hlt">drilling</span> at IODP Site C0009 recovered these geologic materials in cuttings from 704-1604 mbsf, and in ~70 m of <span class="hlt">core</span> from 1510-1594 mbsf. The >4-mm size fraction of cuttings from 1332-1482 mbsf contains abundant vein structures in moderately consolidated, coarse-siltstones. Vein structures are <1 mm-wide granular rearrangements, possibly paleoseismites, and are mostly restricted to the late Miocene section below a significant unconformity at ~1300 mbsf. At Site C0002, close to the southeastern edge of the forearc basin, vein structures were also localized to a narrow depth interval in a slightly younger (Pliocene age) section. The <span class="hlt">cored</span> interval at Site C0009 is from below a prominent unconformity at ~1360 mbsf and comprises finely (~10 cm-scale) interbedded, unmetamorphosed, and moderately cohesive silt- and sandstone. Bedding in the <span class="hlt">cored</span> interval generally dips NNW in logging data and increases in dip from ~20° to ~ 60° with depth in both the FMI and the <span class="hlt">core</span> data. A set of dominantly thrust-sense shear zones cuts and locally imbricates bedding, with dips <20° to >40°. The shear zones are 1-2 cm-wide, exhibit granular rather than cataclastic (fracture-dominated) microstructures, and though dark in appearance and bright in tomographic images (and thus likely higher density than the surrounding <span class="hlt">core</span>), they are mineralogically similar to the surrounding material. The shear zones may have formed during tectonically induced dewatering and consolidation. In many places the shear zones define the center of a gradient in stretched and folded sedimentary structures. Younger faults also appear dark relative to the surrounding <span class="hlt">core</span>, but are <1-mm wide, with a range of geometries and cross cutting relationships; there are likely at least two generations of these thin faults. The youngest faults are in many cases slickensided, exhibit a range of kinematic indicators (thrust, strike-slip, and normal), and have a bimodal dip distribution, ~20° and ~60°. The younger structures may have developed during forearc development of, or beneath the Kumano basin whereas the shear zones likely formed within the frontal region of the late Miocene accretionary prism or possibly along the faulted slope apron.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www.science.siu.edu/academics/dept/syllabi/S14/geo/437.pdf"><span id="translatedtitle">APPLIED <span class="hlt">GEOPHYSICS</span> FIELD CLASS GEOLOGY 437</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Nickrent, Daniel L.</p> <p></p> <p>, IF AVAILABLE, WE WILL VISIT AN OIL <span class="hlt">DRILLING</span> RIG IN OPERATION. DATES FOR FIELD TRIPS WILL DEPEND ON THE WEATHER: 11, 12 V. Visit oil <span class="hlt">drilling</span> rig, seismic reflection crew, and computer lab work WEEKS: 13, 14, 15 VI OF NATURAL RESOURCES INCLUDING OIL, COAL, MINERALS AND GROUNDWATER. OTHER APPLICATIONS OF <span class="hlt">GEOPHYSICS</span> MAY</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=PMC&redirectUrl=http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4483536"><span id="translatedtitle">Effect of Osteonecrosis Intervention Rod Versus <span class="hlt">Core</span> Decompression Using Multiple Small <span class="hlt">Drill</span> Holes on Early Stages of Necrosis of the Femoral Head: A Prospective Study on a Series of 60 Patients with a Minimum 1-Year-Follow-Up</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Miao, Haixiong; Ye, Dongping; Liang, Weiguo; Yao, Yicun</p> <p>2015-01-01</p> <p>Introduction: The conventional CD used 10 mm <span class="hlt">drill</span> holes associated with a lack of structural support. Thus, alternative methods such as a tantalum implant, small <span class="hlt">drill</span> holes, and biological treatment were developed to prevent deterioration of the joint. The treatment of CD by multiple 3.2 mm <span class="hlt">drill</span> holes could reduce the femoral neck fracture and partial weight bearing was allowed. This study was aimed to evaluate the effect of osteonecrosis intervention rod versus <span class="hlt">core</span> decompression using multiple small <span class="hlt">drill</span> holes on early stages of necrosis of the femoral head. Method: From January 2011 to January 2012, 60 patients undergoing surgery for osteonecrosis with <span class="hlt">core</span> decompression were randomly assigned into 2 groups based on the type of <span class="hlt">core</span> decompression used: (1) a total of 30 osteonecrosis patients (with 16 hips on Steinburg stage?,20 hips on Steinburg stage?) were treated with a porous tantalum rod insertion. The diameter of the <span class="hlt">drill</span> hole for the intervention rod was 10mm.(2) a total of 30 osteonecrosis patients (with 14 hips on Steinburg stage?,20 hips on Steinburg stage?) were treated with <span class="hlt">core</span> decompression using five <span class="hlt">drill</span> holes on the lateral femur, the diameter of the hole was 3.2 mm. The average age of the patient was 32.6 years (20-45 years) and the average time of follow-up was 25.6 months (12- 28 months) in the rod implanted group. The average age of the patient was 35.2 years (22- 43 years) and the average time of follow-up was 26.3 months (12-28 months) in the small <span class="hlt">drill</span> holes group. Results: The average of surgical time was 40 min, and the mean volume of blood loss was 30 ml in both surgical groups. The average of Harris score was improved from 56.2 ± 7.1 preoperative to 80.2 ± 11.4 at the last follow-up in the rod implanted group (p < 0.05). The mean Harris score was improved from 53.8 ± 6.6 preoperative to 79.7 ± 13.2 at the last follow-up in the small <span class="hlt">drill</span> holes group (p<0. 05). No significant difference was observed in Harris score between the two groups. At the last follow-up, 28 of 36 hips were at the same radiographic stages as pre-operation, and 8 deteriorated in the rod implanted group. 26 of 34 hips were at the same radiographic stage as pre-operation, and 8 deteriorated in the small <span class="hlt">drill</span> holes group. No significant difference was observed in radiographic stage between the two groups. There was no favourable result on the outcome of a tantalum intervention implant compared to multiple small <span class="hlt">drill</span> holes. Discussion: CD via multiple small <span class="hlt">drill</span> holes would allow similar postoperative load-bearing and seems to result in similar or even better clinical outcome without the prolonged implantation of an expensive tantalum implant. A tantalum rod intervention and <span class="hlt">core</span> decompression using multiple small <span class="hlt">drill</span> holes were effective on the stage I hips rather than stage II hips.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=PUBMED&redirectUrl=http://www.ncbi.nlm.nih.gov/pubmed/18598141"><span id="translatedtitle"><span class="hlt">Drilling</span> systems for extraterrestrial subsurface exploration.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zacny, K; Bar-Cohen, Y; Brennan, M; Briggs, G; Cooper, G; Davis, K; Dolgin, B; Glaser, D; Glass, B; Gorevan, S; Guerrero, J; McKay, C; Paulsen, G; Stanley, S; Stoker, C</p> <p>2008-06-01</p> <p><span class="hlt">Drilling</span> consists of 2 processes: breaking the formation with a bit and removing the <span class="hlt">drilled</span> cuttings. In rotary <span class="hlt">drilling</span>, rotational speed and weight on bit are used to control <span class="hlt">drilling</span>, and the optimization of these parameters can markedly improve <span class="hlt">drilling</span> performance. Although fluids are used for cuttings removal in terrestrial <span class="hlt">drilling</span>, most planetary <span class="hlt">drilling</span> systems conduct dry <span class="hlt">drilling</span> with an auger. Chip removal via water-ice sublimation (when excavating water-ice-bound formations at pressure below the triple point of water) and pneumatic systems are also possible. Pneumatic systems use the gas or vaporization products of a high-density liquid brought from Earth, gas provided by an in situ compressor, or combustion products of a monopropellant. <span class="hlt">Drill</span> bits can be divided into <span class="hlt">coring</span> bits, which excavate an annular shaped hole, and full-faced bits. While cylindrical <span class="hlt">cores</span> are generally superior as scientific samples, and <span class="hlt">coring</span> <span class="hlt">drills</span> have better performance characteristics, full-faced bits are simpler systems because the handling of a <span class="hlt">core</span> requires a very complex robotic mechanism. The greatest constraints to extraterrestrial <span class="hlt">drilling</span> are (1) the extreme environmental conditions, such as temperature, dust, and pressure; (2) the light-time communications delay, which necessitates highly autonomous systems; and (3) the mission and science constraints, such as mass and power budgets and the types of <span class="hlt">drilled</span> samples needed for scientific analysis. A classification scheme based on <span class="hlt">drilling</span> depth is proposed. Each of the 4 depth categories (surface <span class="hlt">drills</span>, 1-meter class <span class="hlt">drills</span>, 10-meter class <span class="hlt">drills</span>, and deep <span class="hlt">drills</span>) has distinct technological profiles and scientific ramifications. PMID:18598141</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2008AsBio...8..665Z"><span id="translatedtitle"><span class="hlt">Drilling</span> Systems for Extraterrestrial Subsurface Exploration</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zacny, K.; Bar-Cohen, Y.; Brennan, M.; Briggs, G.; Cooper, G.; Davis, K.; Dolgin, B.; Glaser, D.; Glass, B.; Gorevan, S.; Guerrero, J.; McKay, C.; Paulsen, G.; Stanley, S.; Stoker, C.</p> <p>2008-06-01</p> <p><span class="hlt">Drilling</span> consists of 2 processes: breaking the formation with a bit and removing the <span class="hlt">drilled</span> cuttings. In rotary <span class="hlt">drilling</span>, rotational speed and weight on bit are used to control <span class="hlt">drilling</span>, and the optimization of these parameters can markedly improve <span class="hlt">drilling</span> performance. Although fluids are used for cuttings removal in terrestrial <span class="hlt">drilling</span>, most planetary <span class="hlt">drilling</span> systems conduct dry <span class="hlt">drilling</span> with an auger. Chip removal via water-ice sublimation (when excavating water-ice bound formations at pressure below the triple point of water) and pneumatic systems are also possible. Pneumatic systems use the gas or vaporization products of a high-density liquid brought from Earth, gas provided by an in situ compressor, or combustion products of a monopropellant. <span class="hlt">Drill</span> bits can be divided into <span class="hlt">coring</span> bits, which excavate an annular shaped hole, and full-faced bits. While cylindrical <span class="hlt">cores</span> are generally superior as scientific samples, and <span class="hlt">coring</span> <span class="hlt">drills</span> have better performance characteristics, full-faced bits are simpler systems because the handling of a <span class="hlt">core</span> requires a very complex robotic mechanism. The greatest constraints to extraterrestrial <span class="hlt">drilling</span> are (1) the extreme environmental conditions, such as temperature, dust, and pressure; (2) the light-time communications delay, which necessitates highly autonomous systems; and (3) the mission and science constraints, such as mass and power budgets and the types of <span class="hlt">drilled</span> samples needed for scientific analysis. A classification scheme based on <span class="hlt">drilling</span> depth is proposed. Each of the 4 depth categories (surface <span class="hlt">drills</span>, 1-meter class <span class="hlt">drills</span>, 10-meter class <span class="hlt">drills</span>, and deep <span class="hlt">drills</span>) has distinct technological profiles and scientific ramifications.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NSDL&redirectUrl=http://www.ngdc.noaa.gov/"><span id="translatedtitle">National <span class="hlt">Geophysical</span> Data Center</span></a></p> <p><a target="_blank" href="http://nsdl.org/nsdl_dds/services/ddsws1-1/service_explorer.jsp">NSDL National Science Digital Library</a></p> <p></p> <p>1997-01-01</p> <p>The National <span class="hlt">Geophysical</span> Data Center (NGDC), located in Boulder, Colorado is a project of the US Department of Commerce, National Oceanic & Atmospheric Administration, and National Environmental Satellite, Data and Information Service. This site is an informational resource for glaciology, marine geology and <span class="hlt">geophysics</span>, paleoclimatology, solar-terrestrial physics, and solid earth <span class="hlt">geophysics</span>. The glaciology section is linked to the National Snow and Ice Data Center website, which offers resources for those interested in studying snow and ice and their relation to Earth systems. The other four sections contain data (often searchable), images, reports, publications and general information on a variety of areas such as bathymetry, ocean <span class="hlt">drilling</span>/seafloor sediment/rock sample data, the geomagnetic field, solar and upper atmospheric data, global climate, heatflow, and much more.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/137799"><span id="translatedtitle">Manganese-oxide minerals in fractures of the Crater Flat Tuff in <span class="hlt">drill</span> <span class="hlt">core</span> USW G-4, Yucca Mountain, Nevada</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Carlos, B.A.; Bish, D.L.; Chipera, S.J.</p> <p>1990-07-01</p> <p>The Crater Flat Tuff is almost entirely below the water table in <span class="hlt">drill</span> hole USW G-4 at Yucca Mountain, Nevada. Manganese-oxide minerals from the Crater Flat Tuff in USW G-4 were studied using optical, scanning electron microscopic, electron microprobe, and x-ray powder diffraction methods to determine their distribution, mineralogy, and chemistry. Manganese-oxide minerals coat fractures in all three members of the Crater Flat Tuff (Prow Pass, Bullfrog, and Tram), but they are most abundant in fractures in the densely welded devitrified intervals of these members. The coatings are mostly of the cryptomelane/hollandite mineral group, but the chemistry of these coatings varies considerably. Some of the chemical variations, particularly the presence of calcium, sodium, and strontium, can be explained by admixture with todorokite, seen in some x-ray powder diffraction patterns. Other chemical variations, particularly between Ba and Pb, demonstrate that considerable substitution of Pb for Ba occurs in hollandite. Manganese-oxide coatings are common in the 10-m interval that produced 75% of the water pumped from USW G-4 in a flow survey in 1983. Their presence in water-producing zones suggests that manganese oxides may exert a significant chemical effect on groundwater beneath Yucca Mountain. In particular, the ability of the manganese oxides found at Yucca Mountain to be easily reduced suggests that they may affect the redox conditions of the groundwater and may oxidize dissolved or suspended species. Although the Mn oxides at Yucca Mountain have low exchange capacities, these minerals may retard the migration of some radionuclides, particularly the actinides, through scavenging and coprecipitation. 23 refs., 21 figs., 2 tabs.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=ERIC&redirectUrl=http://files.eric.ed.gov/fulltext/ED365555.pdf"><span id="translatedtitle">Ocean <span class="hlt">Drilling</span> Simulation Activity.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Telese, James A.; Jordan, Kathy</p> <p></p> <p>The Ocean <span class="hlt">Drilling</span> Project brings together scientists and governments from 20 countries to explore the earth's structure and history as it is revealed beneath the oceans' basins. Scientific expeditions examine rock and sediment <span class="hlt">cores</span> obtained from the ocean floor to learn about the earth's basic processes. The series of activities in this…</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/ds660"><span id="translatedtitle">Construction diagrams, <span class="hlt">geophysical</span> logs, and lithologic descriptions for boreholes USGS 103, 105, 108, 131, 135, NRF-15, and NRF-16, Idaho National Laboratory, Idaho</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Hodges, Mary K.V.; Orr, Stephanie M.; Potter, Katherine E.; LeMaitre, Tynan</p> <p>2012-01-01</p> <p>This report, prepared in cooperation with the U.S. Department of Energy, summarizes construction, <span class="hlt">geophysical</span>, and lithologic data collected from about 4,509 feet of <span class="hlt">core</span> from seven boreholes deepened or <span class="hlt">drilled</span> by the U.S. Geological Survey (USGS), Idaho National Laboratory (INL) Project Office, from 2006 to 2009 at the INL. USGS 103, 105, 108, and 131 were deepened and <span class="hlt">cored</span> from 759 to 1,307 feet, 800 to 1,409 feet, 760 to 1,218 feet, and 808 to 1,239 feet, respectively. Boreholes USGS 135, NRF-15, and NRF-16 were <span class="hlt">drilled</span> and continuously <span class="hlt">cored</span> from land surface to 1,198, 759, and 425 feet, respectively. <span class="hlt">Cores</span> were photographed and digitally logged by using commercially available software. Borehole descriptions summarize location, completion date, and amount and type of <span class="hlt">core</span> recovered.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2014AGUFM.T33A4638D"><span id="translatedtitle">Inferring Earthquake Physics from Deep <span class="hlt">Drilling</span> Projects of Active Faults</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Di Toro, G.; Smith, S. A. F.; Kuo, L. W.; Mittempergher, S.; Remitti, F.; Spagnuolo, E.; Mitchell, T. M.; Gualtieri, A.; Hadizadeh, J.; Carpenter, B. M.</p> <p>2014-12-01</p> <p>Deep <span class="hlt">drilling</span> projects of active faults offer the opportunity to correlate physical and chemical processes identified in <span class="hlt">core</span> samples with experiments reproducing the seismic cycle in the laboratory and with high-resolution seismological and <span class="hlt">geophysical</span> data. Here we discuss the constraints about earthquakes source processes at depth gained by fault <span class="hlt">cores</span> retrieved from the deep <span class="hlt">drilling</span> projects SAFOD (2.7 km depth, San Andreas Fault), J-FAST (0.9 km depth, following the Mw 9.0 Tohoku 2011 earthquake), TCDP (1.1 km depth, following the Mw 7.6 Chi-Chi 1999 earthquake) and WFSD (1.2 km depth, following the Mw 7.9 Wenchuan 2008 earthquake). Recovered samples were tested at room temperature with the rotary shear apparatus SHIVA installed in Rome (INGV, Italy). All the tested samples were made by clay-rich gouges (usually including smectite/illite), though their bulk mineralogy and modal composition were different (e.g., SAFOD samples included saponite, WFSD carbonaceous materials). The gouges were investigated before and after the experiments with scanning and transmission electron microscopy, X-Ray diffraction, micro-Raman spectroscopy, etc. A common behavior of all the tested gouges was that their friction coefficient was low (often less than 0.1) under room-humidity and wet conditions when sheared at slip rates of ca. 1 m/s (seismic deformation conditions). Moreover, when the natural fault rocks next to the principal slipping zones were sheared from sub-seismic (few micrometers/s) to seismic slip rates, the experimental products had similar microstructures to those found in the principal slipping zones of the <span class="hlt">drilled</span> faults. This included the formation of mirror-like surfaces, graphite-rich materials, foliated gouges, nanograins, amorphous materials, etc. In most cases the mechanical data were consistent with several seismological (> 50 m of seismic slip for the fault zone <span class="hlt">drilled</span> by J-FAST) and <span class="hlt">geophysical</span> observations (absence of a thermal anomaly in the fault <span class="hlt">cores</span> of J-FAST and WFSD) which were attributed to an extremely low coseismic fault strength. However, the deformation mechanisms responsible for the measured weakening in the experiments and for the production of the microstructures similar to those found in <span class="hlt">drilled</span> seismic faults have not been deciphered yet.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.usgs.gov/of/1976/0665/plate-1.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1976/0665/plate-2.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1976/0665/plate-3.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1976/0665/plate-4.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1976/0665/plate-5.pdf"><span id="translatedtitle">Basic data from five <span class="hlt">core</span> holes in the Raft River geothermal area, Cassia County, Idaho</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Crosthwaite, E. G., (compiler)</p> <p>1976-01-01</p> <p>meters) were completed in the area (Crosthwaite, 1974), and the Aerojet Nuclear Company, under the auspices of the U.S. Energy Research and Development Administration, was planning some deep <span class="hlt">drilling</span> 4,000 to 6,000 feet (1,200 to 1,800 meters) (fig. 1). The purpose of the <span class="hlt">core</span> <span class="hlt">drilling</span> was to provide information to test <span class="hlt">geophysical</span> interpretations of the subsurface structure and lithology and to provide hydrologic and geologic data on the shallow part of the geothermal system. Samples of the <span class="hlt">core</span> were made available to several divisions and branches of the Geological Survey and to people and agencies outside the Survey. This report presents the basic data from the <span class="hlt">core</span> holes that had been collected to September 1, 1975, and includes lithologic and <span class="hlt">geophysical</span> well logs, chemical analyses of water (table 1), and laboratory analyses of <span class="hlt">cores</span> (table 2) that were completed as of the above date. The data were collected by the Idaho District office, Hydrologic Laboratory, Borehole <span class="hlt">Geophysics</span> Research Project, and <span class="hlt">Drilling</span>, Sampling, and Testing Section, all of the Water Resources Division, and the Branch of Central Environmental Geology of the Geologic Divison.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/10137641"><span id="translatedtitle">Results of Phase 2 postburn <span class="hlt">drilling</span>, <span class="hlt">coring</span>, and logging: Rocky Mountain 1 Underground Coal Gasification Test, Hanna, Wyoming</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Oliver, R.L.; Lindblom, S.R.; Covell, J.R.</p> <p>1991-02-01</p> <p>The Rocky Mountain 1 (RM1) Underground Coal Gasification (UCG) site consisted of two different module configurations: the controlled retracting injection point (CRIP) and elongated linked well (ELW) configurations. The postburn <span class="hlt">coring</span> of the RM1 UCG site was designed in two phases to fulfill seven objectives outlined in Western Research Institute`s Annual Project Plan for 1989 (Western Research Institute 1989). The seven objectives were to (1) delineate the areal extent of the cavities, (2) identify the extent of roof collapse, (3) obtain samples of all major cavity rock types, (4) characterize outflow channels and cavity stratigraphy, (5) characterize the area near CRIP points and ignition points, (6) further define the structural geology of the site, and (7) identify the vertical positioning of the horizontal process wells within the coal seam. Phase 1 of the <span class="hlt">coring</span> was completed during the summer of 1989 and served to partially accomplish all seven objectives. A detailed description of Phase 1 results was presented in a separate report (Lindblom et al. 1990). Phase 2, completed during the summer of 1990, was designed to complete the seven objectives; more specifically, to further define the areal extent and location of the cavities, to evaluate the outflow channels for both modules, and to further characterize the structural geology in the ELW module area.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/5583585"><span id="translatedtitle">Results of Phase 2 postburn <span class="hlt">drilling</span>, <span class="hlt">coring</span>, and logging: Rocky Mountain 1 Underground Coal Gasification Test, Hanna, Wyoming</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Oliver, R.L.; Lindblom, S.R.; Covell, J.R.</p> <p>1991-02-01</p> <p>The Rocky Mountain 1 (RM1) Underground Coal Gasification (UCG) site consisted of two different module configurations: the controlled retracting injection point (CRIP) and elongated linked well (ELW) configurations. The postburn <span class="hlt">coring</span> of the RM1 UCG site was designed in two phases to fulfill seven objectives outlined in Western Research Institute's Annual Project Plan for 1989 (Western Research Institute 1989). The seven objectives were to (1) delineate the areal extent of the cavities, (2) identify the extent of roof collapse, (3) obtain samples of all major cavity rock types, (4) characterize outflow channels and cavity stratigraphy, (5) characterize the area near CRIP points and ignition points, (6) further define the structural geology of the site, and (7) identify the vertical positioning of the horizontal process wells within the coal seam. Phase 1 of the <span class="hlt">coring</span> was completed during the summer of 1989 and served to partially accomplish all seven objectives. A detailed description of Phase 1 results was presented in a separate report (Lindblom et al. 1990). Phase 2, completed during the summer of 1990, was designed to complete the seven objectives; more specifically, to further define the areal extent and location of the cavities, to evaluate the outflow channels for both modules, and to further characterize the structural geology in the ELW module area.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2013AGUFM.V53E..05C"><span id="translatedtitle">Rhyolites in the Kimberly <span class="hlt">Drill</span> <span class="hlt">Core</span>, Project Hotspot: First Intracaldera Ignimbrite from the Central Snake River Plain, Idaho?</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Christiansen, E. H.; McCurry, M. O.; Champion, D. E.; Bolte, T.; Holtz, F.; Knott, T.; Branney, M. J.; Shervais, J. W.</p> <p>2013-12-01</p> <p>The rhyolites on the track of the Yellowstone hotspot are the classic examples of continental hotspot volcanism and the study of surface outcrops is maturing rapidly. However, in the central part of the track, where silicic volcanism is most voluminous, compositionally distinctive, and isotopically most anomalous, study of these large magma systems has been hindered because eruptive sources are buried. The 2 km Kimberly <span class="hlt">core</span> helps fill that gap; it penetrates through surficial basalt, deep into the rhyolitic underpinnings on the southern margin of the province. The Kimberly <span class="hlt">core</span> is dominated by thick sections of rhyolite lava and welded ignimbrite, with basalt-sediment intercalations between 241 m and 424 m depth. We tentatively interpret the <span class="hlt">core</span> to include a thick intracaldera tuff. Our preliminary studies suggest that there are three major rhyolite units in the <span class="hlt">core</span>. Rhyolite 3, the uppermost unit, is a nearly 130 m thick, low-silica rhyolite lava. Rhyolite 2 is the most highly evolved with ~75% silica and distinctively resorbed quartz. Rhyolite 1 is at least 1,340 m thick (the base was not cut by the <span class="hlt">core</span>), has no apparent flow contacts or cooling breaks, and may represent a single, thick intracaldera ignimbrite. Paleomagnetic inclinations form a curious V-shaped profile, shallowing by about 18? between 700 and 1700 m depth. We interpret this to be the result of slower cooling of the mid-part of the thick intracaldera ignimbrite. The lower unit is a low-silica rhyolite with high concentrations of Fe2O3 and TiO2--among the highest of any known ignimbrite on the SRP. It is chemically distinct from the upper units, very homogeneous, not vertically zoned, and lacks multiple populations of phenocrysts. It somewhat resembles the regionally extensive ~10 Ma outflow tuff of Wooden Shoe Butte. However, this is one of several large, petrologically similar ignimbrites as young as 8.6 Ma exposed in the Cassia Mountains south of the hole, so further work is needed. Like most rhyolites from the Snake River Plain, all 3 units have the characteristics of A-type rhyolites with high concentrations of alkalies, high Fe/Mg and TiO2/MgO ratios, as well as high concentrations Nb, Y, Zr and Ga. Initial analyses of plag, cpx, and qtz show that all three units are low ?18O rhyolites, like most from the Central Snake River Plain-- ?18O in feldspar ranges from 1‰ in Rhyolite 1 to 3‰ in Rhyolites 2 and 3. In the thick lower ignimbrite, whole-rock ?18O increases systematically from the base upward (0.5‰ to as much as 9‰ in the altered top and ?D ranges from -140 to -180‰). Whole rock variations correlate with water content, apparently controlled by secondary clay. We suggest that these characteristics were largely imposed by their derivation from partial melting of basaltic sills and surrounding older crust. The low ?18O values reflect recycling of hydrothermally altered crustal rocks and indicate progressive incorporation of more hydrothermally altered material into the younger magmas. More work is needed to establish correlation with regional units, understand the emplacement of the rhyolites and their volcanic setting, and ascertain the origin of these distinctive low ?18O, A-type rhyolites.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://www.springerlink.com/index/90753857755q5202.pdf"><span id="translatedtitle">Evidence for an underground runoff and soil permeability at the Ouled Fayet (Algiers, Algeria) subsurface landfill pilot project from <span class="hlt">geophysical</span> investigations</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Leila Djadia; Djamel Machane; Jean-Luc Chatelain; Abdesslam Abtout; Rabah Bensalem; Mehdi Amine Guemache; Bertrand Guillier; Amar Boudella; El-Hadi Oubaiche</p> <p>2010-01-01</p> <p>Results from <span class="hlt">geophysical</span> investigations (electrical resistivity, electromagnetic mapping and seismic refraction) on an excavated\\u000a cell of the Ouled Fayet (Algiers, Algeria) pilot landfill indicated the presence of an underground runoff and permeable soil\\u000a underneath the cell. These results contradict those obtained by a feasibility study, based, however, only on the analysis\\u000a of seventy-six 10-m <span class="hlt">drilling</span> <span class="hlt">cores</span>. The 1D boreholes information</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2009AGUFMPP41D..07Z"><span id="translatedtitle">Integrated provenance-detrital thermochronology studies in ANDRILL AND-2A <span class="hlt">drill</span> <span class="hlt">core</span>: first evidence of an Oligocene exhumation episode (McMurdo Sound, Antarctica)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zattin, M.; Talarico, F. M.; Sandroni, S.</p> <p>2009-12-01</p> <p>An integrated investigation including provenance analysis of the gravel-fraction and detrital apatite fission-track (AFT) thermochronology on the AND-2A <span class="hlt">core</span> provides new results to constrain the exhumation history of source regions and the reconstruction of sediment provenance models in the Ross Embayment in Late Cenozoic time. All the AFT ages, from 20 samples, evenly distributed in the uppermost 1000 m of the <span class="hlt">core</span>, indicate that the entire succession originated from a source that exhumed in the Oligocene/Late Eocene time. In fact, most of the grains in nearly all the samples can be grouped into a youngest grain-age component (P1) in the range between 21.7 Ma and 43.4 Ma. However, most of the samples show more than one population, documenting the presence of multiple source areas in some periods of the basin history. On the other hand, the presence in some of the samples of a unique peak suggests a limited drainage system, as indicated by the petrographic data. The AFT data indicate the presence of active tectonics at the end of the Oligocene, therefore suggesting a source of sediments located along the Transantarctic Mountains (TAM) south of the Dry Valleys Block, where bedrock AFT ages indicate an older (Eocene) exhumation phase. Hence, the idea of a structural segmentation of the TAM during the Cenozoic (Wilson, Glob. Plan. Change, 1999) is well supported by these data. Provenance analysis of the gravel fraction highlights significant down-<span class="hlt">core</span> modal and compositional variations and the occurrence of two main basement clast assemblages, diagnostic of specific source regions and occurring in distinct <span class="hlt">core</span> sections: a) including marbles, garnet micaschists and diopside schists, suggesting oscillation of "local" glaciers in the on-shore area close to the AND-2A <span class="hlt">drill</span> site, and b) low-grade metasediments and alkaline granites, indicating oscillations of a most extensive ice sheet/shelf with a clear provenance from the Skelton-Mulock glacier area. These data agree with AFT ages as both the methodologies give a clear indication for sources located in the southern McMurdo Sound. The compositional shifts of TAM-derived clasts suggest a dynamic behavior (waxing and waning) of the Antarctic Ice Sheets. In particular, expansions of the ice-flow lines of Skelton and Mulock glaciers into the McMurdo Sound are similar to the glaciological reconstructions for the Last Glacial Maximum and, consistently with provenance and glaciological models based on the AND-1B record, they can be interpreted as the result of West Antarctic Ice Sheet influence on provenance and dispersal of sediments in the Ross Embayment.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li class="active"><span>11</span></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_11 --> <div id="page_12" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li class="active"><span>12</span></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="221"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/6286387"><span id="translatedtitle">Results of Phase 1 postburn <span class="hlt">drilling</span> and <span class="hlt">coring</span>, Rocky Mountain 1 Underground Coal Gasification Site, Hanna Basin, Wyoming</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lindblom, S.R.; Covell, J.R.; Oliver, R.L.</p> <p>1990-09-01</p> <p>The Rocky Mountain 1 (RM1) Underground Coal Gasification (UCG) test consisted of two different module configurations: the controlled retracting injection point (CRIP) and elongated linked well (ELW) configurations. The postburn <span class="hlt">coring</span> of the RM1 UCG site was designed in two phases to fulfill seven objectives outlined in the Western Research Institute's (WRI) annual project plan for 1988--1989. The seven objectives were to (1) delineate the areal extent of the cavities, (2) identify the extent of roof collapse, (3) obtain samples of all major cavity rock types, (4) characterize outflow channels and cavity stratigraphy, (5) characterize the area near CRIP points and ignition points, (6) further define the structural geology of the site, and (7) identify the vertical positioning of the horizontal process wells within the coal seam. Phase 1 of the <span class="hlt">coring</span> was completed in the summer of 1989 and served to partially accomplish all seven objectives. In relation to the seven objectives, WRI determined that (1) the ELW cavity extends farther to the west and the CRIP cavity was located 5--10 feet farther to the south than anticipated; (2) roof collapse was contained within unit A in both modules; (3) samples of all major rock types were recovered; (4) insufficient data were obtained to characterize the outflow channels, but cavity stratigraphy was well defined; (5) bore holes near the CRIP points and ignition point did not exhibit characteristics significantly different from other bore holes in the cavities; (6) a fault zone was detected between VIW=1 and VIW-2 that stepped down to the east; and (7) PW-1 was only 7--12 feet below the top of the coal seam in the eastern part of the ELW module area; and CIW-1 was located 18--20 feet below the top of the coal seam in the CRIP module area. 7 refs., 7 figs., 1 tab.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2015SciDr..19....1L"><span id="translatedtitle">COSC-1 - <span class="hlt">drilling</span> of a subduction-related allochthon in the Palaeozoic Caledonide orogen of Scandinavia</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lorenz, H.; Rosberg, J.-E.; Juhlin, C.; Bjelm, L.; Almqvist, B. S. G.; Berthet, T.; Conze, R.; Gee, D. G.; Klonowska, I.; Pascal, C.; Pedersen, K.; Roberts, N. M. W.; Tsang, C.-F.</p> <p>2015-05-01</p> <p>The Collisional Orogeny in the Scandinavian Caledonides (COSC) scientific <span class="hlt">drilling</span> project focuses on mountain building processes in a major mid-Palaeozoic orogen in western Scandinavia and its comparison with modern analogues. The project investigates the subduction-generated Seve Nape Complex. These in part under ultra-high-pressure conditions metamorphosed outer continental margin and continent-ocean transition zone assemblages were emplaced onto the Baltoscandian platform and there influenced the underlying allochthons and the basement. COSC-1 is the first of two ca. 2.5 km deep, fully <span class="hlt">cored</span> <span class="hlt">drill</span> holes located in the vicinity of the abandoned Fröå mine, close to the town of Åre in Jämtland, central Sweden. It sampled a thick section of the lower part of the Seve Complex and was planned to penetrate its basal thrust zone into the underlying lower-grade metamorphosed allochthon. The <span class="hlt">drill</span> hole reached a depth of 2495.8 m and nearly 100 % <span class="hlt">core</span> recovery was achieved. Although planning was based on existing geological mapping and new high-resolution seismic surveys, the <span class="hlt">drilling</span> resulted in some surprises: the Lower Seve Nappe proved to be composed of rather homogenous gneisses, with only subordinate mafic bodies, and its basal thrust zone was unexpectedly thick (> 800 m). The <span class="hlt">drill</span> hole did not penetrate the bottom of the thrust zone. However, lower-grade metasedimentary rocks were encountered in the lowermost part of the <span class="hlt">drill</span> hole together with garnetiferous mylonites tens of metres thick. The tectonostratigraphic position is still unclear, and geological and <span class="hlt">geophysical</span> interpretations are under revision. The compact gneisses host only eight fluid conducting zones of limited transmissivity between 300 m and total depth. Downhole measurements suggest an uncorrected average geothermal gradient of ~ 20 °C km-1. This paper summarizes the operations and preliminary results from COSC-1 (ICDP 5054-1-A), <span class="hlt">drilled</span> from early May to late August 2014, and is complemented by a detailed operational report and the data repository.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2014AGUFM.H33B0800K"><span id="translatedtitle">Deep <span class="hlt">Drilling</span> to Decipher Potential Interaction Between Shallow and Deep Fluid Systems: Preliminary Results From the INFLUINS <span class="hlt">Drilling</span> Campaign in the Thuringian Basin, Central Germany</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kukowski, N.; Totsche, K. U.; Methe, P.; Goepel, A.; Abratis, M.; Habisreuther, A.; Kunkel, C.; Ward, T.</p> <p>2014-12-01</p> <p>To shed light on the coupled dynamics of near surface and deep fluid systems in a sedimentary basin on various scales, ranging from the pore scale to the extent of an entire basin, is the overall goal of INFLUINS (INtegrated FLuid dynamics IN Sedimentary basins). To do so is essential to understand the functioning of sedimentary basins fluid systems. An integral INFLUINS topic also is the potential interaction of aquifers within a basin and at its rims. Regionally, INFLUINS is focusing on the Thuringian basin, a well-confined, intra-continental sedimentary basin in central Germany as a natural geo-laboratory. The Thuringian basin is composed of sedimentary rocks from the latest Paleozoic and mainly Triassic and particularly suited to undertake such research as it is of relative small size, about 50 times 100 km, easily accessible, and quite well known from previous studies. INFLUINS consists on several projects tightly connected to each other and coming from various disciplines of geosciences including among others <span class="hlt">geophysics</span>, hydrogeology, sedimentology, mineralogy, and remote sensing. A deep <span class="hlt">drilling</span> campaign, which took place close to Erfurt in the center of the basin in summer 2013, is one of the main achievements of INFLUINS. In preparation for deep <span class="hlt">drilling</span>, in 2011, we conducted an extensive seismic reflection site survey, in the framework of which the center of the basin down to the top basement was imaged in high quality. <span class="hlt">Drilling</span> went down to a depth of 1179 m, <span class="hlt">drilling</span> Triassic rocks from Keuper to lower Buntsandstein and led to more than 500 m of <span class="hlt">cores</span> of excellent quality and more than 600 cuttings samples. Down-hole <span class="hlt">geophysical</span> logging over the entire depth of the <span class="hlt">drill</span> hole is complemented with Multi Sensor <span class="hlt">Core</span> Logging leading to an extensive <span class="hlt">geophysical</span> data set with a spatial resolution up to the cm-scale. Here, we present overall results of the <span class="hlt">drilling</span> campaign and focus on the boundaries between major groups as well as between prominent beds including e.g. rock salt and other pronounced aquitards.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.usgs.gov/of/1978/0592/plate-01.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-02.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-03.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-04.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-05.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-06.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-07.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-08.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-09.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-10.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-11.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-12.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-13.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-14.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-15.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-16.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-17.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-18.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-19.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-20.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-21.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-22.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-23.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-24.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-25.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1978/0592/plate-26.pdf"><span id="translatedtitle">Test <span class="hlt">drilling</span> for potash resources: Waste Isolation Pilot Plant Site, Eddy County, New Mexico</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Jones, C.L.</p> <p>1978-01-01</p> <p>Twenty-one borings to augment existing information on potash resources at the proposed site for a waste isolation pilot plant in eastern Eddy County, N. Mex., were <span class="hlt">drilled</span> and logged in an 11-week period, mid-August to November 1976. The basic data developed from the borings are tabulated in the present report. The tabulation includes lithologic and <span class="hlt">geophysical</span> logs of all the borings, as well as the results of chemical analyses, X-ray determinations, and calculations to establish a modal mineralogical composition of <span class="hlt">core</span> samples from potash ore zones and mineralized salt beds.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://iodp.tamu.edu/publications/AR/FY09AR.pdf"><span id="translatedtitle">Integrated Ocean <span class="hlt">Drilling</span> Program U.S. Implementing Organization</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>Integrated Ocean <span class="hlt">Drilling</span> Program U.S. Implementing Organization FY09 Annual Report #12;Discrete <span class="hlt">core</span> sampling #12;The Integrated Ocean <span class="hlt">Drilling</span> Program (IODP) is an international marine research successes of the Deep Sea <span class="hlt">Drilling</span> Project (DSDP) and the Ocean <span class="hlt">Drilling</span> Program (ODP), programs</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=ERIC&redirectUrl=http://files.eric.ed.gov/fulltext/ED524982.pdf"><span id="translatedtitle">Lockdown <span class="hlt">Drills</span></span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>North Dakota Department of Public Instruction, 2011</p> <p>2011-01-01</p> <p>As a result of House Bill 1215, introduced and passed during the 2011 North Dakota legislative session, every school building in North Dakota must conduct a lockdown <span class="hlt">drill</span>. While no timeframe, tracking or penalty was identified in the state law, the North Dakota Department of Public Instruction (DPI) advocates annual <span class="hlt">drills</span>, at a minimum, which…</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=ERIC&redirectUrl=http://eric.ed.gov/?q=Education+AND+disaster+AND+prevention&pg=4&id=EJ577182"><span id="translatedtitle">Disaster <span class="hlt">Drill</span>.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Jones, Rebecca</p> <p>1998-01-01</p> <p>Bus disaster <span class="hlt">drills</span> have been held all over country for years. A <span class="hlt">drill</span> in Blairsville, Pennsylvania, taught officials important lessons: (1) keep roster of students and stops in designated area on bus, and ensure emergency workers know where location; (2) send at least three school officials to accident scene; (3) provide school officials with…</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NSDL&redirectUrl=https://astrobiology.nasa.gov/articles/2004/09/23/drilling-on-autopilot/"><span id="translatedtitle"><span class="hlt">Drilling</span> on Autopilot</span></a></p> <p><a target="_blank" href="http://nsdl.org/nsdl_dds/services/ddsws1-1/service_explorer.jsp">NSDL National Science Digital Library</a></p> <p>Henry Bortman</p> <p></p> <p>This magazine article features an interview with Mars Analog Research and Technology Experiment (MARTE) scientist Carol Stoker. In this final session of the four-part series, Stoker talks about MARTE's technology objective: developing a fully automated <span class="hlt">drilling</span> and life-detection system. Her team is <span class="hlt">drilling</span> into the pyrite subsurface of Spain's Rio Tinto in search for microbes existing in an iron-sulfur-based energy system, similar to that of Mars. She discuses the technical and monetary challenges of developing both the hardware and software for the first ever completely robotic system to do <span class="hlt">core</span> <span class="hlt">drilling</span> and sample analysis autonomously. The resource includes images from the Mars rover project, links to related web sites, and an MP3 Audio Machine text-to-speech option.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www.washington.edu/burkemuseum/collections/paleontology/sidor/Sidor_et_al_2005.pdf"><span id="translatedtitle">6. Wysession, M. et al. The <span class="hlt">Core</span>-Mantle Boundary Region 273298 (American <span class="hlt">Geophysical</span> Union, Washington, DC, 1998).</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Sidor, Christian</p> <p></p> <p>, 169­171 (2004). 16. Lithgow-Bertelloni, C. & Richards, M. A. The dynamics of Cenozoic and Mesozoic-post perovskite phase change near the <span class="hlt">core</span>-mantle boundary in compressible mantle convection. Geophys. Res. Lett@ess.ucla.edu). .............................................................. Permian tetrapods from the Sahara show climate-controlled endemism in Pangaea Christian A. Sidor1 , F</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://iodp.tamu.edu/publications/resources/IODP_bibliography.pdf"><span id="translatedtitle">Comprehensive Ocean <span class="hlt">Drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>Comprehensive Ocean <span class="hlt">Drilling</span> Bibliography containing citations related to the Deep Sea <span class="hlt">Drilling</span> Project, Ocean <span class="hlt">Drilling</span> Program, Integrated Ocean <span class="hlt">Drilling</span> Program, and International Ocean Discovery Program Last updated: May 2014 #12;Comprehensive Bibliography Comprehensive Ocean <span class="hlt">Drilling</span> Bibliography</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6159269"><span id="translatedtitle">Drainhole <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Schuh, F. J.</p> <p>1985-05-28</p> <p>A method for <span class="hlt">drilling</span> a well in the earth for the production of minerals therefrom wherein a primary wellbore is first <span class="hlt">drilled</span> into the earth, the primary wellbore being a deviated wellbore having a radius of curvature in the range of from about 2.5 to about 6 degrees per 100 feet of primary wellbore length, and then <span class="hlt">drilling</span> from said primary wellbore at least one drainhole wellbore, said drainhole wellbore having a radius of curvature in the range of from about 0.2 to about 3 degrees per 1 foot of drainhole wellbore length.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2007M%26PS...42..483K"><span id="translatedtitle">An international and multidisciplinary <span class="hlt">drilling</span> project into a young complex impact structure: The 2004 ICDP Bosumtwi Crater <span class="hlt">Drilling</span> Project—An overview</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Koeberl, Christian; Milkereit, Bernd; Overpeck, Jonathan T.; Scholz, Christopher A.; Amoako, Philip Y. O.; Boamah, Daniel; Danuor, Sylvester; Karp, Tobias; Kueck, Jochem; Hecky, Robert E.; King, John W.; Peck, John A.</p> <p></p> <p>The Bosumtwi impact crater in Ghana, arguably the best-preserved complex young impact structure known on Earth, displays a pronounced rim and is almost completely filled by Lake Bosumtwi, a hydrologically closed basin. It is the source crater of the Ivory Coast tektites. The structure was excavated in 2.1-2.2 Gyr old metasediments and metavolcanics of the Birimian Supergroup. A <span class="hlt">drilling</span> project was conceived that would combine two major scientific interests in this crater: 1) to obtain a complete paleoenvironmental record from the time of crater formation about one million years ago, at a near-equatorial location in Africa for which very few data are available so far, and 2) to obtain a complete record of impactites at the central uplift and in the crater moat, for ground truthing and comparison with other structures. Within the framework of an international and multidisciplinary <span class="hlt">drilling</span> project led by the International Continental Scientific <span class="hlt">Drilling</span> Program (ICDP), 16 <span class="hlt">drill</span> <span class="hlt">cores</span> were obtained from June to October 2004 at six locations within Lake Bosumtwi, which is 8.5 km in diameter. The 14 sediment <span class="hlt">cores</span> are currently being investigated for paleoenvironmental indicators. The two impactite <span class="hlt">cores</span> LB-07A and LB-08A were <span class="hlt">drilled</span> into the deepest section of the annular moat (540 m) and the flank of the central uplift (450 m), respectively. They are the main subject of this special issue of Meteoritics & Planetary Science, which represents the first detailed presentations of results from the deep <span class="hlt">drilling</span> into the Bosumtwi impactite sequence. <span class="hlt">Drilling</span> progressed in both cases through the impact breccia layer into fractured bedrock. LB-07A comprises lithic (in the uppermost part) and suevitic impact breccias with appreciable amounts of impact melt fragments. The lithic clast content is dominated by graywacke, besides various metapelites, quartzite, and a carbonate target component. Shock deformation in the form of quartz grains with planar microdeformations is abundant. First chemical results indicate a number of suevite samples that are strongly enriched in siderophile elements and Mg, but the presence of a definite meteoritic component in these samples cannot be confirmed due to high indigenous values. <span class="hlt">Core</span> LB-08A comprises suevitic breccia in the uppermost part, followed with depth by a thick sequence of graywacke-dominated metasediment with suevite and a few granitoid dike intercalations. It is assumed that the metasediment package represents bedrock intersected in the flank of the central uplift. Both 7A and 8A suevite intersections differ from suevites outside of the northern crater rim. Deep <span class="hlt">drilling</span> results confirmed the gross structure of the crater as imaged by the pre-<span class="hlt">drilling</span> seismic surveys. Borehole <span class="hlt">geophysical</span> studies conducted in the two boreholes confirmed the low seismic velocities for the post-impact sediments (less than 1800 m/s) and the impactites (2600- 3300 m/s). The impactites exhibit very high porosities (up to 30 vol%), which has important implications for mechanical rock stability. The statistical analysis of the velocities and densities reveals a seismically transparent impactite sequence (free of prominent internal reflections). Petrophysical <span class="hlt">core</span> analyses provide no support for the presence of a homogeneous magnetic unit (= melt breccia) within the center of the structure. Borehole vector magnetic data point to a patchy distribution of highly magnetic rocks within the impactite sequence. The lack of a coherent melt sheet, or indeed of any significant amounts of melt rock in the crater fill, is in contrast to expectations from modeling and pre-<span class="hlt">drilling</span> <span class="hlt">geophysics</span>, and presents an interesting problem for comparative studies and requires re-evaluation of existing data from other terrestrial impact craters, as well as modeling parameters.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/5796006"><span id="translatedtitle">Sedimentary dynamics on isolated highs in Lake Baikal: evidence from detailed high-resolution <span class="hlt">geophysical</span> data and sediment <span class="hlt">cores</span></span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>F. Charlet; N. Fagel; M. De Batist; F. Hauregard; B. Minnebo; D. Meischner; SONIC Teamd</p> <p>2005-01-01</p> <p>High- and very-high-resolution seismic data, side-scan sonar mosaics and piston <span class="hlt">cores</span> from three isolated highs in Lake Baikal (Vydrino Shoulder, Posolsky Bank, Continent Ridge) have allowed to document in unprecedented detail the depositional, re-depositional and tectonic processes and to characterise the overal sedimentary environment on such isolated highs. Our data show that Vydrino Shoulder actually represents a turbidity- or underflow-sourced</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://oaktrust.library.tamu.edu//handle/1969.1/126268"><span id="translatedtitle">Gas <span class="hlt">Drill</span> </span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Unknown</p> <p>2011-09-05</p> <p>Formation damage has long been recognized as a potential source of reduced productivity and injectivity in both horizontal and vertical wells. From the moment that the pay zone is being <span class="hlt">drilled</span> until the well is put on production, a formation...</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://oaktrust.library.tamu.edu//handle/1969.1/126208"><span id="translatedtitle"><span class="hlt">Drill</span> Field </span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Unknown</p> <p>2011-09-05</p> <p>Gas hydrate research in the last two decades has taken various directions ranging from ways to understand the safe and economical production of this enormous resource to <span class="hlt">drilling</span> problems. as more rigs and production platforms move into deeper...</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/5597950"><span id="translatedtitle">Chattanooga Shale (Devonian and Mississippian) from the Tennessee Division of Geology - US Department of Energy <span class="hlt">cored</span> <span class="hlt">drill</span> hle number 3, Hancock County, Tennessee</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Roen, J.B.; Milici, R.C.; Wallace, L.G.</p> <p>1980-05-01</p> <p>This report presents a detailed lithologic description and gamma-ray log of the <span class="hlt">drill</span> hole which is located on the Calvert Johnson property in the Sneedville 7.5-minute quadrangel, Hancock County. (DLC)</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://kuscholarworks.ku.edu/handle/1808/9815"><span id="translatedtitle">Microtubules in hyaloclasts from the Hawaii Scientific <span class="hlt">Drilling</span> Project #2 phase 1 <span class="hlt">core</span>, Hilo, Hawaii: evidence of microbe-rock interactions</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Metevier, Kimberly Elizabeth</p> <p>2011-12-31</p> <p>Minute tubules etched into basalt glass in hyaloclastites from the Hawaii Scientific <span class="hlt">Drilling</span> Project #2 (HSDP) phase 1 borehole are interpreted as trace fossils formed by microbes, i.e. microendolithic borings. Such borings are one to a few...</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/399666"><span id="translatedtitle">Geology of the USW SD-7 <span class="hlt">drill</span> hole Yucca Mountain, Nevada</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Rautman, C.A. [Sandia National Laboratories, Albuquerque, NM (United States); Engstrom, D.A. [Spectra Research Inst., Albuquerque, NM (United States)</p> <p>1996-09-01</p> <p>The USW SD-7 <span class="hlt">drill</span> hole is one of several holes <span class="hlt">drilled</span> under Site Characterization Plan Study 8.3.1.4.3.1, also known as the Systematic <span class="hlt">Drilling</span> Program, as part of the U.S. Department of Energy characterization program at Yucca Mountain, Nevada. The Yucca Mountain site has been proposed as the potential location of a repository for high-level nuclear waste. The SD-7 <span class="hlt">drill</span> hole is located near the southern end of the potential repository area and immediately to the west of the Main Test Level drift of the Exploratory Studies Facility. The hole is not far from the junction of the Main Test Level drift and the proposed South Ramp decline. <span class="hlt">Drill</span> hole USW SD-7 is 2675.1 ft (815.3 m) deep, and the <span class="hlt">core</span> recovered nearly complete sections of ash-flow tuffs belonging to the lower half of the Tiva Canyon Tuff, the Pah Canyon Tuff, and the Topopah Spring Tuff, all of which are part of the Miocene Paintbrush Group. <span class="hlt">Core</span> was recovered from much of the underlying Calico Hills Formation, and <span class="hlt">core</span> was virtually continuous in the Prow Pass Tuff and the Bullfrog Tuff. The SD-7 <span class="hlt">drill</span> hole penetrated the top several tens of feet into the Tram Tuff, which underlies the Prow Pass and Bullfrog Tuffs. These latter three units are all formations of the Crater Flat Group, The <span class="hlt">drill</span> hole was collared in welded materials assigned to the crystal-poor middle nonlithophysal zone of the Tiva Canyon Tuff; approximately 280 ft (85 m) of this ash-flow sheet was penetrated by the hole. The Yucca Mountain Tuff appears to be missing from the section at the USW SD-7 location, and the Pah Canyon Tuff is only 14.5 ft thick. The Pah Canyon Tuff was not recovered in <span class="hlt">core</span> because of <span class="hlt">drilling</span> difficulties, suggesting that the unit is entirely nonwelded. The presence of this unit is inferred through interpretation of down-hole <span class="hlt">geophysical</span> logs.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/ofr20071094"><span id="translatedtitle">Site Report for USGS Test Holes <span class="hlt">Drilled</span> at Cape Charles, Northampton County, Virginia, in 2004</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Gohn, Gregory S.; Sanford, Ward E.; Powars, David S.; Horton, J. Wright, Jr.; Edwards, Lucy E.; Morin, Roger H.; Self-Trail, Jean M.</p> <p>2007-01-01</p> <p>The U.S. Geological Survey <span class="hlt">drilled</span> two test holes near Cape Charles, Virginia, during May and June 2004, as part of an investigation of the buried, late Eocene Chesapeake Bay impact structure. The first hole is designated as the USGS-Sustainable Technology Park test hole #1 (USGS-STP1). This test hole was abandoned at a depth of 300 ft; cuttings samples were collected, but no <span class="hlt">cores</span> or <span class="hlt">geophysical</span> logs were acquired. The second hole is designated as the USGS-Sustainable Technology Park test hole #2 (USGS-STP2). This test hole was <span class="hlt">drilled</span> to a depth of 2,699 ft. <span class="hlt">Cores</span> were collected between depths of 1,401.7 ft and 1,420.7 ft and between 2,440.0 ft and 2,699.0 ft. Cuttings samples were collected from the uncored intervals below 280-ft depth. Interim sets of <span class="hlt">geophysical</span> logs were acquired during the <span class="hlt">drilling</span> operation, and one final set was acquired at the end of <span class="hlt">drilling</span>. Two wells were installed in the USGS-STP2 test hole. The deep well (designated 62G-24) was screened between 2,260 ft and 2,280 ft, and the shallow well (designated 62G-25) was screened between 1,360 ft and 1,380 ft. Ground-water salinities stabilized at 40 parts per thousand for the deep well and 20 parts per thousand for the shallow well. The geologic section encountered in the test holes consists of three main units: (1) Eocene, Oligocene, Miocene, Pliocene, and Pleistocene sands and clays are present between land surface and a depth of 1,163 ft; (2) sediment-clast breccias of the impact structure are present between depths of 1,163 ft and 2,150 ft; and (3) crystalline-clast breccias and cataclastic gneiss of the impact structure are present between depths of 2,150 ft and 2,699 ft.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/70036121"><span id="translatedtitle">Parallelization of GeoClaw code for modeling <span class="hlt">geophysical</span> flows with adaptive mesh refinement on many-<span class="hlt">core</span> systems</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Zhang, S.; Yuen, D.A.; Zhu, A.; Song, S.; George, D.L.</p> <p>2011-01-01</p> <p>We parallelized the GeoClaw code on one-level grid using OpenMP in March, 2011 to meet the urgent need of simulating tsunami waves at near-shore from Tohoku 2011 and achieved over 75% of the potential speed-up on an eight <span class="hlt">core</span> Dell Precision T7500 workstation [1]. After submitting that work to SC11 - the International Conference for High Performance Computing, we obtained an unreleased OpenMP version of GeoClaw from David George, who developed the GeoClaw code as part of his PH.D thesis. In this paper, we will show the complementary characteristics of the two approaches used in parallelizing GeoClaw and the speed-up obtained by combining the advantage of each of the two individual approaches with adaptive mesh refinement (AMR), demonstrating the capabilities of running GeoClaw efficiently on many-<span class="hlt">core</span> systems. We will also show a novel simulation of the Tohoku 2011 Tsunami waves inundating the Sendai airport and Fukushima Nuclear Power Plants, over which the finest grid distance of 20 meters is achieved through a 4-level AMR. This simulation yields quite good predictions about the wave-heights and travel time of the tsunami waves. ?? 2011 IEEE.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li class="active"><span>12</span></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_12 --> <div id="page_13" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li class="active"><span>13</span></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="241"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6997938"><span id="translatedtitle">Well <span class="hlt">drilling</span> cuttings disposal</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Nahm, J.J.W.</p> <p>1994-01-11</p> <p><span class="hlt">Drilled</span> cuttings are disposed of by solidification by <span class="hlt">drilling</span> with a <span class="hlt">drilling</span> fluid containing blast furnace slag, thereby producing <span class="hlt">drilled</span> cuttings and other solid wastes, concentrating the wastes and then solidifying the concentrated wastes. <span class="hlt">Drilling</span> wastes solidified by blast furnace slag are hard and unleachable and the blast furnace slag is compatible with both oil and water based <span class="hlt">drilling</span> muds and <span class="hlt">drilled</span> cuttings. <span class="hlt">Drilling</span> fluids therefore do not have to be removed from the <span class="hlt">drilled</span> cuttings prior to solidification in a mud pit.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2015EGUGA..17.3027J"><span id="translatedtitle">ICDP <span class="hlt">drilling</span> in the Scandinavian Caledonides: Plans for COSC-2</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Juhlin, Christopher; Lorenz, Henning; Almqvist, Bjarne; Gee, David; Pascal, Christophe; Tsang, Chin-Fu; Pedersen, Karsten; Roberts, Nick; Rosberg, Jan-Erik</p> <p>2015-04-01</p> <p>Previous <span class="hlt">drilling</span> in the Caledonian front, along with seismic reflection and magnetotelluric profiling, has shown that the sole thrust of the orogen, defined by the base of the Jämtlandian fold-and-thrust belt, dips gently westwards (1-2 degrees), with organic-rich black alum shales in the footwall underlain by a basal Cambrian unconformity and Paleoproterozoic granites and gneisses (perhaps also Mesoproterozoic sandstones). These basement rocks are remarkable for their pattern of prominent seismic reflections, some of which are almost certainly related to hypabyssal mafic intrusions, as exposed in the autochthon to the east of the Caledonian thrust front. Others may be thrust zones, or a combination of both, with the mafic sheets variously rotated and sheared. A key component of COSC-2 is to penetrate these reflectors and determine their origin and age (either Caledonian or Precambrian, or both), perhaps defining the Sveconorwegian deformation front beneath these central parts of the Scandes. COSC-2 will start in the lower thrust sheets, pass through the basal décollement and investigate the character of the deformation in the underlying basement. Combined seismic and magnetotelluric (MT) data provide control on the basement structure and the depth to the basal décollement, which is believed to host the highly conductive Alum Shale. New seismic data acquired in 2014 combined with previous data help define the depth where distinct basement reflectors can be penetrated. <span class="hlt">Drilling</span> into the basement and understanding of the deformation pattern and the age of deformation are keys to unraveling the collisional process. COSC-2 will also be fully <span class="hlt">cored</span> and the <span class="hlt">drilling</span> program, as well as the on-site science, will build on the experience from <span class="hlt">drilling</span> of COSC-1. Applications for <span class="hlt">drilling</span> related costs will be made to ICDP and the Swedish Research Council and, if funded, <span class="hlt">drilling</span> will be carried out in 2017. Researchers interested in any aspect of the COSC project are invited to join and participate in on-site science, <span class="hlt">core</span> studies and downhole <span class="hlt">geophysics</span>, on their own funding.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2015EGUGA..17.3029J"><span id="translatedtitle">ICDP <span class="hlt">drilling</span> in the Scandinavian Caledonides: Preliminary results from COSC-1</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Juhlin, Christopher; Lorenz, Henning; Almqvist, Bjarne; Gee, David; Pascal, Christophe; Tsang, Chin-Fu; Pedersen, Karsten; Roberts, Nick; Rosberg, Jan-Erik</p> <p>2015-04-01</p> <p>The Collisional Orogeny in the Scandinavian Caledonides (COSC) project is a multidisciplinary investigation of the Scandian mountain belt. Cenozoic uplift of the Scandes has exposed a lower- to middle-crustal level section through this Himalaya-type orogen, providing unique opportunities to better understand not only the Caledonides, but also on-going orogeny and the earthquake-prone environments of modern mountains belts. COSC will also contribute to our knowledge of mountain belt hydrology, provide new data on deep thermal gradients for paleoclimate modeling and potential geothermal energy resources of the area, contribute new information about the deep biosphere, and improve our understanding of the <span class="hlt">geophysical</span> response of the sub-surface. Two 2.5 km deep fully <span class="hlt">cored</span> holes will help achieve these goals with the first one, COSC-1, completed in late August 2014. COSC-1 targeted the high-grade metamorphic complex of the Seve Nappes (SNC) and the contact with the underlying allochthon. <span class="hlt">Drilling</span> was performed using an Atlas Copco CT20 diamond <span class="hlt">core-drilling</span> rig, operated by Lund University, that resulted in nearly 100% <span class="hlt">core</span> recovery to 2.5 km depth. A crew of 6 on-site researchers examined the <span class="hlt">core</span> as it came up and performed on-site documentation of it; including photography, optical <span class="hlt">core</span> scanning, physical property measurements and biological sampling. A number of <span class="hlt">geophysical</span> logging suites were run during and after completion of <span class="hlt">drilling</span>, including sonic, density, electric, temperature and acoustic televiewer logs. A near four week long seismic acquisition program followed in the Fall of 2014 with combined surface and borehole surveys in the vicinity of COSC-1. On-site <span class="hlt">core</span> analysis indicates that the SNC is about 2 km thick (the lower boundary is not well defined), consisting mainly of gneisses and amphibolites. A zone of extensive shearing is found in the lowermost 500 m of the borehole. Metamorphosed sandstones intercalated with garnetiferous mylonites in this lower part of the drillcore suggest that underlying thrust sheets of the Middle Allochthon have been penetrated, but not the low greenschist facies turbidites and other metasediments of the Lower Allochthon. Logging-while-pumping tests show that there are 8 significant hydraulically conductive zones in an otherwise tight rock down to 2.5 km. Pore waters appear to be relatively fresh throughout the borehole. Bottom hole temperatures are expected to reach 60°C after equilibration, giving a geothermal gradient of over 20°C/km. The observed high seismic reflectivity of the SNC is due to the large contrast in density and velocity between the gneiss and amphibolite. In general, the <span class="hlt">geophysical</span> response on the surface is consistent with observations in the borehole.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=19940007631&hterms=satellite+structure&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dsatellite%2Bstructure"><span id="translatedtitle"><span class="hlt">Geophysical</span> signature of the Pretoria saltpan impact structure and a possible satellite crater</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Brandt, D.; Durrheim, R. J.; Reimold, W. U.</p> <p>1993-01-01</p> <p>The Pretoria Saltpan Crater is located in the southern portion of the Bushveld Igneous Complex, some 40 km NNW of Pretoria, South Africa, at 25 deg 24 min 30 sec S/28 deg 4 min 59 sec E. An origin by impact for this crater structure was recently confirmed. The results of the only gravity reconnaissance carried out over the crater to date failed to support an impact origin. With the aid of recent results obtained from a central <span class="hlt">drill-core</span>, it was necessary to carry out more <span class="hlt">geophysical</span> work which would include a gravity profile of higher resolution. A second, smaller, circular depression (about 400 m in diameter) to the SW of the crater is suggestive of a twin crater. This site had never been investigated, and thus various <span class="hlt">geophysical</span> surveys were conducted.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/41949563"><span id="translatedtitle">The role of downhole measurements in marine geology and <span class="hlt">geophysics</span></span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>David Goldberg</p> <p>1997-01-01</p> <p>During the last 25 years, downhole measurements have been increasingly used for scientific applications in marine geology and <span class="hlt">geophysics</span>, particularly in deep-sea <span class="hlt">drilling</span> operations. Used mostly by the oil industry to map promising formations for exploration and production of hydrocarbons, a variety of instruments have been developed that can be lowered down <span class="hlt">drill</span> holes to extract information about the subsurface</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://icecube.wisc.edu/icecube/static/outreach/ice_drilling.pdf"><span id="translatedtitle">Ice <span class="hlt">Drilling</span> Gallonmilkjugs</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Saffman, Mark</p> <p></p> <p>Ice <span class="hlt">Drilling</span> Materials · Gallonmilkjugs · Syringes,largeand small · Pitchers · Spraybottles · 13x9? ·Isitbettertosquirtthewaterslowlyorasquicklyaspossible? ·Doestherateatwhichyousquirtthewaterchangethediameteroftheholes? ·Doesthetypeof`<span class="hlt">drill</span></p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/5776354"><span id="translatedtitle">Interpretation of <span class="hlt">drill</span> cuttings from geothermal wells</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Hulen, J.B.; Sibbett, B.S.</p> <p>1981-06-01</p> <p>Problems in interpreting <span class="hlt">drill</span> cuttings, as opposed to <span class="hlt">drill</span> <span class="hlt">cores</span>, and methods to solve these problems are outlined. The following are covered: identification of lithology; recognition of faults and fractures; interpretation of hydrothermal alteration; geochemistry; sample collection; sample preparple examination; and sample storage. (MHR)</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/55287427"><span id="translatedtitle">Nature and significance of igneous rocks <span class="hlt">cored</span> in the State 2-14 research borehole: Salton Sea Scientific <span class="hlt">Drilling</span> Project, California</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Charles T. Herzig; Wilfred A. Elders</p> <p>1988-01-01</p> <p>The State 2-14 research borehole of the Salton Sea Scientific <span class="hlt">Drilling</span> Project penetrated 3.22 km of Pleistocene to Recent sedimentary rocks in the Salton Sea geothermal system, located in the Salton Trough of southern California and northern Baja California, Mexico. In addition, three intervals of igneous rocks were recovered; a silicic tuff and two sills of altered diabase. The chemical</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2015EGUGA..1715473R"><span id="translatedtitle">COSC-1 technical operations: <span class="hlt">drilling</span> and borehole completion</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rosberg, Jan-Erik; Bjelm, Leif; Larsson, Stellan; Juhlin, Christopher; Lorenz, Henning; Almqvist, Bjarne</p> <p>2015-04-01</p> <p>COSC-1, the first out of the two planned fully <span class="hlt">cored</span> boreholes within the COSC-project, was completed in late August 2014. <span class="hlt">Drilling</span> was performed using the national scientific <span class="hlt">drilling</span> infrastructure, the so called Riksriggen, operated by Lund University, and resulted in a 2495.8 m deep borehole with almost 100 % <span class="hlt">core</span> recovery. The rig is an Atlas Copco CT20C diamond <span class="hlt">core-drill</span> rig, a rig type commonly used for mineral exploration. A major advantage with this type of <span class="hlt">drill</span> rig compared to conventional rotary rigs is that it can operate on very small <span class="hlt">drill</span> sites. Thus, it leaves a small environmental footprint, in this case around 1000 m2. The rig was operated by 3 persons over 12 hour shifts. Before the <span class="hlt">core</span> <span class="hlt">drilling</span> started a local <span class="hlt">drilling</span> company installed a conductor casing down to 103 m, which was required for the installation of a Blow Out Preventer (BOP). The <span class="hlt">core</span> <span class="hlt">drilling</span> operation started using H-size and a triple tube <span class="hlt">core</span> barrel (HQ3), resulting in a hole diameter of 96 mm and a <span class="hlt">core</span> diameter of 61.1 mm down to 1616 m. In general, the <span class="hlt">drilling</span> using HQ3 was successful with 100 % <span class="hlt">core</span> recovery and <span class="hlt">core</span> was acquired at rate on the order 30-60 m/day when the <span class="hlt">drilling</span> wasn't interrupted by other activities, such as bit change, servicing or testing. The HRQ-<span class="hlt">drill</span> string was installed as a temporary casing from surface down to 1616 m. Subsequently, <span class="hlt">drilling</span> was conducted down to 1709 m with N-size and a triple tube <span class="hlt">core</span> barrel (NQ3), resulting in a hole diameter of 75.7 mm and a <span class="hlt">core</span> diameter of 45 mm. At 1709 m the <span class="hlt">coring</span> assembly was changed to N-size double tube <span class="hlt">core</span> barrel (NQ), resulting in a hole diameter of 75.7 mm and a <span class="hlt">core</span> diameter of 47.6 mm and the <span class="hlt">core</span> barrel extended to 6 m. In this way precious time was saved and the good rock quality ensured high <span class="hlt">core</span> recovery even with the double tube. In general, the <span class="hlt">drilling</span> using NQ3 and NQ was successful with 100 % <span class="hlt">core</span> recovery at around 36 m/day by the end of the <span class="hlt">drilling</span> operation. The main problem during the <span class="hlt">drilling</span> operation was caused by brand new <span class="hlt">drill</span> rods that were bent beyond tolerance. These bent <span class="hlt">drill</span> rods caused increased friction during <span class="hlt">drilling</span>, resulting in an increased torque and consequently a too low RPM. Thus, <span class="hlt">drill</span> bits wore out faster than normal. Despite of this, the target depth was reached, but later than planned to the <span class="hlt">drill</span> bits being replaced more frequently. However, it can be concluded that the <span class="hlt">drilling</span> operation was successful as evidenced by <span class="hlt">drilling</span> almost 2400 m with full <span class="hlt">core</span> recovery of top quality <span class="hlt">cores</span> and no <span class="hlt">drilling</span> crew accidents. The COSC-borehole is the deepest <span class="hlt">drilled</span> hole in Sweden using H- and N-size and the deepest hole ever <span class="hlt">drilled</span> by an Atlas Copco CT20C. The present borehole is cased down to 103 m and the rest of the hole, around 2400 m, is left as an open-hole completion.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/823392"><span id="translatedtitle">RESULTS FROM THE (1) DATA COLLECTION WORKSHOP, (2) MODELING WORKSHOP AND (3) <span class="hlt">DRILLING</span> AND <span class="hlt">CORING</span> METHODS WORKSHOP AS PART OF THE JOINT INDUSTRY PARTICIPATION (JIP) PROJECT TO CHARACTERIZE NATURAL GAS HYDRATES IN THE DEEPWATER GULF OF MEXICO</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Stephen A. Holditch; Emrys Jones</p> <p>2002-09-01</p> <p>In 2000, Chevron began a project to learn how to characterize the natural gas hydrate deposits in the deepwater portions of the Gulf of Mexico. A Joint Industry Participation (JIP) group was formed in 2001, and a project partially funded by the U.S. Department of Energy (DOE) began in October 2001. The primary objective of this project is to develop technology and data to assist in the characterization of naturally occurring gas hydrates in the deepwater Gulf of Mexico. These naturally occurring gas hydrates can cause problems relating to <span class="hlt">drilling</span> and production of oil and gas, as well as building and operating pipelines. Other objectives of this project are to better understand how natural gas hydrates can affect seafloor stability, to gather data that can be used to study climate change, and to determine how the results of this project can be used to assess if and how gas hydrates act as a trapping mechanism for shallow oil or gas reservoirs. As part of the project, three workshops were held. The first was a data collection workshop, held in Houston during March 14-15, 2002. The purpose of this workshop was to find out what data exist on gas hydrates and to begin making that data available to the JIP. The second and third workshop, on Geoscience and Reservoir Modeling, and <span class="hlt">Drilling</span> and <span class="hlt">Coring</span> Methods, respectively, were held simultaneously in Houston during May 9-10, 2002. The Modeling Workshop was conducted to find out what data the various engineers, scientists and geoscientists want the JIP to collect in both the field and the laboratory. The <span class="hlt">Drilling</span> and <span class="hlt">Coring</span> workshop was to begin making plans on how we can collect the data required by the project's principal investigators.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/ofr20061213"><span id="translatedtitle">Analytical results from samples collected during coal-bed methane exploration <span class="hlt">drilling</span> in Caldwell Parish, Louisiana</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Warwick, Peter D.; Breland, F. Clayton, Jr.; Hackley, Paul C.; Dulong, Frank T.; Nichols, Douglas J.; Karlsen, Alexander W.; Bustin, R. Marc; Barker, Charles E.; Willett, Jason C.; Trippi, Michael H.</p> <p>2006-01-01</p> <p>In 2001, and 2002, the U.S. Geological Survey (USGS) and the Louisiana Geological Survey (LGS), through a Cooperative Research and Development Agreement (CRADA) with Devon SFS Operating, Inc. (Devon), participated in an exploratory <span class="hlt">drilling</span> and <span class="hlt">coring</span> program for coal-bed methane in north-central Louisiana. The USGS and LGS collected 25 coal <span class="hlt">core</span> and cuttings samples from two coal-bed methane test wells that were <span class="hlt">drilled</span> in west-central Caldwell Parish, Louisiana. The purpose of this report is to provide the results of the analytical program conducted on the USGS/LGS samples. The data generated from this project are summarized in various topical sections that include: 1. molecular and isotopic data from coal gas samples; 2. results of low-temperature ashing and X-ray analysis; 3. palynological data; 4. down-hole temperature data; 5. detailed <span class="hlt">core</span> descriptions and selected <span class="hlt">core</span> photographs; 6. coal physical and chemical analytical data; 7. coal gas desorption results; 8. methane and carbon dioxide coal sorption data; 9. coal petrographic results; and 10. <span class="hlt">geophysical</span> logs.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2012AGUFM.V31D2823H"><span id="translatedtitle">DEGAS experiments on volcanic glass samples from AND-1B <span class="hlt">drill</span> <span class="hlt">core</span>: implications for primary magmatic versus secondary H2O</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Heide, K.; Cameron, B. I.; Krans, S. R.</p> <p>2012-12-01</p> <p>The existence of volcanic glass in the AND-1B <span class="hlt">drill</span> <span class="hlt">core</span> erupted subaquesously or even subglacially affords the possibility of constraining water depth by measuring the volatile content of the glass only if primary magmatic H2O contents can be recognized from secondary H2O. The glass samples studied come from Lithostratigraphic Unit (LU) 2 between 92 and 145 m depth. The black and well sorted sands from subunit 2.4 were most likely derived from subaerial Hawaiian/Strombolian type eruptions. The graded bedding exposed in this subunit may result from fallout of tephra through the water column. Glass fragments from six different depths within subunit 2.4 were extracted from AND-1B sediment first by magnetic separation and then approximately 100 mg of the freshest glass fragments were handpicked under a binocular microscope. The six glass separates were heated in a DEGAS-device up to 1450°C in high vacuum and the liberated volatiles were determined by a simultaneous mass spectrometric analysis. This study was focused on the determination of H2O, CO2, H2, HF, H2S, HCl, SO2, and hydrocarbon species. The six degassing experiments were carried out using a special high-vacuum-hot-extraction method combined with aquadrupol mass spectrometer. Measurements were carried out at less than 10-4 to 10-3Pa and a linear heating rate (10K/min) at a temperature range between room temperature to 1450°C. The volatile species were analyzed in multiple ion detection mode. DEGAS experiments occur under highly non-equilibrium conditions so that reverse reactions between volatiles or between volatiles and the melt are largely prevented. For each glass sample, volatile release occurs at different rates and intensities at different temperatures. Based on the gas release profiles obtained, degassing processes take place in three separate temperature ranges. Low temperature degassing occurs at temperatures up to 500°C and likely represents the liberation of surface bounded volatiles such as H2O in the samples from depths 110.87, 112.51 and 114.47. Moderate temperature degassing occurs between 500 and 800°C likely related to decomposition of silicate mineral (e.g. mica, illite) as well as sulfides with a maximum at 750°C. Above 700°C all samples release HF together with H2O, and HCl is liberated in two samples. A high temperature degassing process occurs above 1000°C and likely reflects the primary magmatic volatile content of the sample. Most characteristic of this degassing step is the SO2 release at a maximum of 1050°C and traces of HCl release. CO2 escaped over a large temperature interval of 600 to 1250°C. The DEGAS experiments consistently showed HCl, SO2 and H2S release above 1000°C. Moreover, secondary H2O predominates over primary magmatic H2O in the six ANDRILL glass samples. The low primary magmatic H2O contents suggest that the glasses were erupted subaerially and experienced near complete degassing during ascent and emplacement at the surface.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2014LPICo1800.5171L"><span id="translatedtitle">"Mission to Rochechouart": <span class="hlt">Drilling</span> Project and Colaterals</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lambert, P.; Allard, J. L.; Rougier, J. M.</p> <p>2014-09-01</p> <p>Rochechouart National Reserve offers to <span class="hlt">drill</span> <span class="hlt">core</span> the impact deposits and underlying target and to manage the samples making them available to the scientific community at large. The latter is invited to express interest in studying the samples.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/1988EOSTr..69..850K"><span id="translatedtitle">A Practical Introduction to Borehole <span class="hlt">Geophysics</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Keller, George V.</p> <p></p> <p>During 1986, the latest year for which data have been published, 57,036 deep wells were <span class="hlt">drilled</span> in the United States and Canada in the search for oil and gas, and about 20,000 were <span class="hlt">drilled</span> in the rest of the world. T he wells in North America penetrated some 46,328 miles into the Earth, providing access to an immense amount of otherwise invisible geology. Wells were also <span class="hlt">drilled</span> for other reasons, such as the search for water, economic mineral resources, and even scientific information. Considering only the holes <span class="hlt">drilled</span> for oil and gas, virtually every one has been logged with one or more <span class="hlt">geophysical</span> surveys. In the last 40 years, several million such <span class="hlt">geophysical</span> surveys have been run and are now preserved in various data libraries. This data base of <span class="hlt">geophysical</span> surveys run in boreholes is perhaps the largest data base we have in the Earth sciences, and to date, it has been relatively little utilized for any purpose other than evaluating possible hydrocarbon content in suspected reservoir rocks. In the past decade there has been a growing interest in making more use of this data base, which may well explain the appearance of at least a half dozen books on <span class="hlt">geophysical</span> well surveying over the last several years.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/51277662"><span id="translatedtitle">Determination of Stress State in Deep Subsea Formation by Combination of Hydrofracturing Test and <span class="hlt">Core</span> Analysis - A Case Study in the Integrated Ocean <span class="hlt">Drilling</span> Program (IODP) Expedition 319</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>T. Ito; A. Funato; H. Ito; M. Kinoshita</p> <p>2010-01-01</p> <p>As the first expedition of the NanTroSEIZE Stage 2, IODP Expedition 319 was carried out in 2009, and a borehole was <span class="hlt">drilled</span> to 1603.7 mbsf (meters below seafloor) from seafloor at 2054 m water depth of Site C0009 which is located in a central region of the Kumano forearc basin and the upper plate above the seismogenic and presumed locked</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2014AGUFMPP31C1149F"><span id="translatedtitle">Plio-Quaternary Stepwise Aridification of the Asian Inland: Multi-Proxy Records from a 938.5m <span class="hlt">Drill</span> <span class="hlt">Core</span> in the Western Qaidam Basin, NE Tibet Plateau</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Fang, X.; Xi, X.; Li, M.; Appel, E.</p> <p>2014-12-01</p> <p>The Qaidam Basin is a largest closed basin in the northeastern Tibetan Plateau which is now under hyperarid climate. A 938.5 m-long <span class="hlt">core</span> was <span class="hlt">drilled</span> in the Qahansilatu depression in the western Qaidam Basin with an average <span class="hlt">core</span> recovery rate of 95%. It consists of lacustrine grayish mudstone and siltstones with upperward increasing interbedded salt layers. High resolution paleomagnetic and OSL-U/Th dating of the <span class="hlt">core</span> determine the <span class="hlt">core</span> formed between 2.77 Na and 0.1 Ma. Detailed examinations of lithofacies, evaporative minerals, carbon and oxygen isotopes, grain size, bioproductivity and redox conditions collectively reveal that the climate was dry since 2.77Ma and became intensively dried at about 2.5 Ma, 2.2 Ma, 1.6 Ma, 1.2 Ma, 0.9 Ma, 0.6 Ma and 0.1 Ma. Accompanying this stepwise aridifications is the phased shrinkage of the paleo-Qaidam lake from the semi-deep brackish lake in early stage via shallow brackish lake and perennial saline lake to playa saline lake in late stage and completely dried out at the end. Episodic global cooling and tectonic uplift of the NE Tibetan Plateau are possible forcing.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/1999EOSTr..80..367A"><span id="translatedtitle">New wireline seafloor <span class="hlt">drill</span> augers well</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Allerton, S.; Wallis, D.; Derrick, J.; Smith, D.; MacLeod, C. J.</p> <p></p> <p>The first trials of a new wireline seafloor <span class="hlt">drill</span> (Figure 1) have been a resounding success, and the new technology is expected to open up the ocean basins for in-depth studies in microtectonics and paleomagnetism. Structural and paleomagnetic work has been extremely important for tectonics on the continents, and extending such studies into the ocean basins, through development of wireline <span class="hlt">drilling</span>, puts us on the brink of a new phase in research.Funded through the British Mid-Ocean Ridge Initiative (BRIDGE), the <span class="hlt">drill</span> is known as the BRIDGE <span class="hlt">drill</span>. On its very first deployment from a ship, it recovered over half a meter of oriented gabbro <span class="hlt">core</span> from the Atlantis Bank on the South West Indian Ridge (Figure 2). In the course of the research cruise, the <span class="hlt">drill</span> took short oriented hardrock <span class="hlt">cores</span> from 11 different seafloor sites [MacLeod et al., 1998].</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NSDL&redirectUrl=http://nicl.usgs.gov/index.html"><span id="translatedtitle">USGS National Ice <span class="hlt">Core</span> Laboratory</span></a></p> <p><a target="_blank" href="http://nsdl.org/nsdl_dds/services/ddsws1-1/service_explorer.jsp">NSDL National Science Digital Library</a></p> <p></p> <p></p> <p>This United States Geological Survey site highlights the work of the National Ice <span class="hlt">Core</span> Laboratory (NICL). It discusses the NICL's role, why ice <span class="hlt">cores</span> are important to study, how ice <span class="hlt">cores</span> are <span class="hlt">drilled</span> and studied, and <span class="hlt">core</span> <span class="hlt">drilling</span> locations. These <span class="hlt">cores</span> are recovered and studied for a variety of scientific investigations, most of which focus on the reconstruction of Earth's climate history. The facility currently houses over 14,000 meters of ice <span class="hlt">cores</span> from 34 <span class="hlt">drill</span> sites in Greenland, Antarctica, and high mountain glaciers in the Western United States. There are links for more information and individual <span class="hlt">core</span> information such as numbers, locations and sizes.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2013EGUGA..1512007D"><span id="translatedtitle">Rationale for future Antarctic and Southern Ocean <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>De Santis, Laura; Gohl, Karsten; Larter, Rob; Escutia, Carlota; Ikehara, Minoru; Hong, JongKuk; Naish, Tim; Barrett, Peter; Rack, Frank; Wellner, Julia</p> <p>2013-04-01</p> <p>Valuable insights into future sensitivity of the Antarctic cryosphere to atmospheric and oceanic warming can be gained from the geologic record of past climatic warm intervals. Continental to deep ocean sediments provide records of contemporaneous changes in ice sheet extent and oceanographic conditions that extend back in time, including periods with atmospheric CO2 levels and temperatures similar to those likely to be reached in the next 100 years. The Circum-Antarctic region is under-sampled respect to scientific ocean <span class="hlt">drilling</span>. However, recovery from glacially-influenced, continental shelf and rise sediments (expeditions ODP178, 188 and IODP 318), provided excellent records of Cenozoic climate and ice sheet evolution. The ANtarctic <span class="hlt">DRILLing</span> program achieved >98% recovery on the Ross Sea shelf with a stable platform on fast ice with riser <span class="hlt">drilling</span> technology. Newer technologies, such as the MeBo shallow <span class="hlt">drilling</span> rig will further improve Antarctic margin <span class="hlt">drilling</span>. <span class="hlt">Drilling</span> around Antarctica in the past decades revealed cooling and regional ice growth during the Cenozoic, coupled with paleogeographic, CO2 atmosphere concentration and global temperature changes. Substantial progress has been made in dating sediments and in the interpretation of paleoclimate/paleoenvironmental proxies in Antarctic margin sediments (e.g. orbital scale variations in Antarctica's cryosphere during the Miocene and Pliocene). Holocene ultra-high resolution shelf sections recently recovered can be correlated to the ice <span class="hlt">core</span> record, to detect local mechanisms versus inter-hemispheric connections. While the potential for reconstructing past ice sheet history has been demonstrated through a careful integration of geological and <span class="hlt">geophysical</span> data with numerical ice sheet modelling, uncertainties remain high due to the sparse geographic distribution of the records and the regional variability in the ice sheet's response. Projects developed using a multi-leg, multi-platform approach (e.g. latitudinal and/or depth transects involving a combination of land/ice shelf, seabed, riser, and riserless <span class="hlt">drilling</span> platforms) will likely make the most significant scientific advances. Fundamental hypothesis can be tested and accomplished by <span class="hlt">drilling</span> depth transects from ice-proximal to ice-distal locations, that will enable researchers to link past perturbations in the ice sheet with Southern Ocean and global climate dynamics. The variable response of the ice sheet to ongoing climatic change mandates broad geographic <span class="hlt">drilling</span> coverage, particularly in climatically sensitive regions, like those with large upstream drainage basins, whose marine terminus is presently melting, due to ocean, warming water impinging the continental shelf. Key transects were identified at community workshops (http://www.scar-ace.org) in the frame of the SCAR/ACE (Antarctic Climate Evolution) and PAIS (Past Antarctic Ice Sheet dynamics) programs. New proposals, also for MSP expeditions were then submitted to IODP, in addition to the existing ones, in the frame of a scientific concerted strategy and with a significant European participation. Main questions underpinning future scientific <span class="hlt">drilling</span> tied IODP Science themes: 1) How did and will the Antarctic Ice Sheets respond to elevated temperatures and atmospheric pCO2? What is the contribution of Antarctic ice to past and future sea level changes? 2) What was the timing of rifting and subsidence controlling the opening of ocean gateways and the initiation of the circumpolar current system and the onset of glaciations?</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/5528953"><span id="translatedtitle">Deep <span class="hlt">drilling</span> phase of the Pen Brand Fault Program</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Stieve, A.</p> <p>1991-05-15</p> <p>This deep <span class="hlt">drilling</span> activity is one element of the Pen Branch Fault Program at Savannah River Site (SRS). The effort will consist of three tasks: the extension of wells PBF-7 and PBF-8 into crystalline basement, geologic and <span class="hlt">drilling</span> oversight during <span class="hlt">drilling</span> operations, and the lithologic description and analysis of the recovered <span class="hlt">core</span>. The <span class="hlt">drilling</span> program addresses the association of the Pen Branch fault with order fault systems such as the fault that formed the Bunbarton basin in the Triassic.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li class="active"><span>13</span></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_13 --> <div id="page_14" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li class="active"><span>14</span></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="261"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/ofr78799"><span id="translatedtitle">Geologic and <span class="hlt">geophysical</span> data from Osceola National Forest, Florida</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Miller, James Andrew</p> <p>1978-01-01</p> <p>Ten <span class="hlt">core</span> holes were <span class="hlt">drilled</span> as part of a hydrologic study of Osceola National Forest. This report describes the detailed lithology of the <span class="hlt">cores</span> taken from test <span class="hlt">drilling</span>, illustrates gamma-ray logs obtained from the test holes and from wells near the forest, and lists the microfauna obtained and identified from the <span class="hlt">cores</span>. (Woodard-USGS)</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/6284080"><span id="translatedtitle"><span class="hlt">Drill</span> string enclosure</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Jorgensen, D.K.; Kuhns, D.J.; Wiersholm, O.; Miller, T.A.</p> <p>1993-03-02</p> <p>The <span class="hlt">drill</span> string enclosure consists of six component parts, including; a top bracket, an upper acrylic cylinder, an acrylic <span class="hlt">drill</span> casing guide, a lower acrylic cylinder, a bottom bracket, and three flexible ducts. The upper acrylic cylinder is optional based upon the <span class="hlt">drill</span> string length. The <span class="hlt">drill</span> string enclosure allows for an efficient <span class="hlt">drill</span> and sight operation at a hazardous waste site.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=ERIC&redirectUrl=http://files.eric.ed.gov/fulltext/ED013042.pdf"><span id="translatedtitle">WRITING ORAL <span class="hlt">DRILLS</span>.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>NEY, JAMES W.</p> <p></p> <p>ALL ORAL LANGUAGE <span class="hlt">DRILLS</span> MAY BE SEPARATED INTO TWO TYPES--(1) MIM-MEM OR MIMICRY MEMORIZATION <span class="hlt">DRILLS</span> OR (2) PATTERN PRACTICE <span class="hlt">DRILLS</span>. THESE TWO LARGER CATEGORIES CAN BE SUB-DIVIDED INTO A NUMBER OF OTHER TYPES, SUCH AS TRANSFORMATION AND SUBSTITUTION <span class="hlt">DRILLS</span>. THE USE OF ANY PARTICULAR TYPE DEPENDS ON THE PURPOSE TO WHICH THE <span class="hlt">DRILL</span> IS PUT. IN ANY…</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/868685"><span id="translatedtitle"><span class="hlt">Drill</span> string enclosure</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Jorgensen, Douglas K. (Idaho Falls, ID); Kuhns, Douglass J. (Idaho Falls, ID); Wiersholm, Otto (Idaho Falls, ID); Miller, Timothy A. (Idaho Falls, ID)</p> <p>1993-01-01</p> <p>The <span class="hlt">drill</span> string enclosure consists of six component parts, including; a top bracket, an upper acrylic cylinder, an acrylic <span class="hlt">drill</span> casing guide, a lower acrylic cylinder, a bottom bracket, and three flexible ducts. The upper acrylic cylinder is optional based upon the <span class="hlt">drill</span> string length. The <span class="hlt">drill</span> string enclosure allows for an efficient <span class="hlt">drill</span> and sight operation at a hazardous waste site.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NSDL&redirectUrl=http://crustal.usgs.gov/geophysics/index.html"><span id="translatedtitle"><span class="hlt">Geophysical</span> Products</span></a></p> <p><a target="_blank" href="http://nsdl.org/nsdl_dds/services/ddsws1-1/service_explorer.jsp">NSDL National Science Digital Library</a></p> <p></p> <p></p> <p>The <span class="hlt">Geophysical</span> Products Web site is maintained and provided by the USGS Crustal Imaging and Characterization Team, who "devise new methods for understanding the Earth and apply these methods in interdisciplinary research projects to solve pressing earth-system problems." This comprehensive accumulation of resources includes Regional and State Grid and Database Compilations, Magnetic Reports and Surveys, Gravity Reports and Surveys, Electrical Reports and Surveys, MagnetoTelluric Reports and Surveys, Multi-Discipline Reports and Surveys, <span class="hlt">Geophysical</span> Software, Fact Sheets, <span class="hlt">Geophysical</span> Products available on CD-ROMS, <span class="hlt">geophysical</span> links, and more. The single page site, although seemingly limited, does offer a great deal of information that should be of use to researchers and professionals.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2012EGUGA..14.7352W"><span id="translatedtitle">In situ gas concentrations in the Kumano forearc basin from <span class="hlt">drilling</span> mud gas monitoring and sonic velocity data (IODP NanTroSEIZE Exp. 319 Site C0009)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wiersberg, T.; Doan, M.-L.; Schleicher, A. M.; Horiguchi, K.; Eguchi, N.; Erzinger, J.</p> <p>2012-04-01</p> <p>Conventional IODP shipboard methods of gas investigations comprise gas sampling from <span class="hlt">core</span> voids and headspace gas sampling followed by shipboard gas analysis. These methods possibly underestimate the in situ gas concentration due to <span class="hlt">core</span> degassing during retrieval and handling on deck. In few cases, a Pressure <span class="hlt">Core</span> Sampler (PCS) was used in the past to overcome this problem, providing gas concentrations one or two order of magnitude higher than headspace gas analysis from corresponding depths. Here, we describe two new techniques applied during IODP NanTroSEIZE Exp. 319 Site C0009 riser <span class="hlt">drilling</span> in the Kumano forearc basin to estimate in situ gas concentrations without <span class="hlt">drill</span> <span class="hlt">core</span> recovery. During riser <span class="hlt">drilling</span> of site C0009 between 703 to 1594 mbsf, gas was continuously extracted from returing <span class="hlt">drilling</span> mud and analysed in real-time (<span class="hlt">drill</span> mud gas monitoring). This method results in information on the gas composition and gas concentration at depth. The chemical (C1-C3) and isotope (?13C, H/D) composition of hydrocarbons, the only formation-derived gases identified in <span class="hlt">drill</span> mud, demonstrate a microbial hydrocarbon gas source mixing with small but increasing amounts of thermogenic gas at greater depth. Methane content in <span class="hlt">drilling</span> mud semi-quantitatively correlates with visible allochtonous material (wood, lignite) in <span class="hlt">drilling</span> cuttings. In situ gas concentration determination from <span class="hlt">drill</span> mud gas monitoring based on the assumption that gas is either liberated from the rock into the <span class="hlt">drilling</span> mud during <span class="hlt">drilling</span> and ascent with the mud column or remains in the pore space of the <span class="hlt">drilling</span> cuttings. <span class="hlt">Drilling</span> mud gas data were calibrated with a defined amount of C2H2 (175 l [STP]) from a carbide test and result in methane concentrations reaching up to 24 lgas/lsediment, in good agreement with findings from other IODP Legs using the PCS. Hydrocarbon gas concentrations in <span class="hlt">drilling</span> cuttings from C0009 are significantly lower, indicating cuttings outgassing during ascent of the <span class="hlt">drill</span> mud column to the surface. An alternative method to quantify free gas is the analysis of high quality sonic data from wireline logging to infer the porosity and estimate the water content stored in intergranular pores and the gas saturation (Doan et al., 2011). <span class="hlt">Drill</span> mud gas monitoring and sonic velocity data analysis reveal similar depth concentration profiles for C0009 and in situ gas concentrations in fairly good agreement. The further observation implies that formation gas is located in the pore space of the rock and does e.g. not penetrate into the borehole through fractures and faults. Doan, M.-L.; Conin, M.; Henry, P.; Wiersberg, T.; Boutt, D.; Buchs, D.; Saffer, D.; McNeill, L. C.; Cukur, D.; Lin, W. (2011) Quantification of free gas in the Kumano fore-arc basin detected from borehole physical properties: IODP Nan TroSEIZE <span class="hlt">drilling</span> Site C0009. Geochemistry <span class="hlt">Geophysics</span> Geosystems, 12, Q0AD06, doi: 10.1029/2010GC003284</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://www.agu.org/journals/jb/v087/iB08/JB087iB08p06631/JB087iB08p06631.pdf"><span id="translatedtitle">Hydrofracturing stress measurements in the Iceland Research <span class="hlt">Drilling</span> Project <span class="hlt">drill</span> hole at Reydarfjordur, Iceland</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Bezalel C. Haimson; Fritz Rummel</p> <p>1982-01-01</p> <p>Two independent suites of hydrofracturing stress measurements were conducted in the top 600 m of the Iceland Research <span class="hlt">Drilling</span> Project deep hole at Reydarfjordur, east Iceland. As indicated by the continuously extracted <span class="hlt">drill</span> <span class="hlt">core</span>, the tested section consists of tertiary subaerial tholeiitic lava flows cut by many basaltic dikes. The density of the basalt was used to estimate the vertical</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/53276954"><span id="translatedtitle">Development of new and improvement of existing <span class="hlt">core</span> recovery methods</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>C. Marx; E. J. Kroemer</p> <p>1982-01-01</p> <p>Prospecting of new oil and gas fields through sampling of soil by <span class="hlt">core</span> <span class="hlt">drilling</span> was investigated. Two <span class="hlt">core</span> recovery methods were designed; corresponding prototypes were built and tested. The <span class="hlt">drill</span> mandrel, the <span class="hlt">core</span> barrel closing system, solliciation of the barrel by hydraulic friction, and sollicitation of the driving axe during side <span class="hlt">drilling</span> were studied. The <span class="hlt">core</span> barrel system with built</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NSDL&redirectUrl=http://www.odplegacy.org/"><span id="translatedtitle">Ocean <span class="hlt">Drilling</span> Program Legacy</span></a></p> <p><a target="_blank" href="http://nsdl.org/nsdl_dds/services/ddsws1-1/service_explorer.jsp">NSDL National Science Digital Library</a></p> <p></p> <p></p> <p>The Ocean <span class="hlt">Drilling</span> Program (ODP) conducted basic research into Earth processes by recovering sediment and rock samples from below the ocean floor and using the resulting holes to perform downhole measurements and experiments. The program, which lasted from 1983 to 2003, published thousands of pages of data and reports, which are now available online. The materials include information on sampling procedures, permanent <span class="hlt">core</span> archives, repositories, and micropaleontological reference centers. Available publications include ODP proceedings and scientific results; initial and preliminary reports; technical notes and reports; citations; the ODP bibliography, dictionary, and editorial guide; and issues of the JOIDES (Joint Oceanographic Institutions for Deep Earth Sampling) Journal from 1975 to 2004. There are also links to ODP <span class="hlt">core</span> data and logs and extensive data documentation. Other links access ODP outreach materials, information on engineering and science operations, cruise leg summaries and discovery highlights, and information on the administration of the program.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/53689288"><span id="translatedtitle">Mars and Lunar Vacuum Chamber Testing Facilities and Vacuum Rated <span class="hlt">Drill</span> Systems</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>K. Zacny; G. Paulsen; J. Craft; M. Maksymuk; C. Santoro; J. Wilson</p> <p>2009-01-01</p> <p>Martian and Lunar low pressure and vacuum conditions, respectively, greatly affect the performance of the <span class="hlt">drilling</span> mechanics and <span class="hlt">drill</span> hardware. For this reason, it is imperative to test planetary sampling and <span class="hlt">coring</span> <span class="hlt">drills</span> under these specific environments. Honeybee Robotics acquired an 11ft vacuum chamber that is currently being used to test <span class="hlt">drills</span> to 1m depth and more. A separate cooling</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=19720000413&hterms=oil+drill&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Doil%2Bdrill"><span id="translatedtitle">Chuck for delicate <span class="hlt">drills</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Copeland, C. S.</p> <p>1972-01-01</p> <p>Development of oil film technique to couple power between drive spindle and <span class="hlt">drill</span> chuck for delicate <span class="hlt">drilling</span> operations is discussed. Oil film permits application of sufficient pressure, but stops rotating when <span class="hlt">drill</span> jams. Illustration of equipment is provided.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=19940007608&hterms=dolomite+core&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Ddolomite%2Bcore"><span id="translatedtitle">Strontium and oxygen isotope study of M-1, M-3 and M-4 <span class="hlt">drill</span> <span class="hlt">core</span> samples from the Manson impact structure, Iowa: Comparison with Haitian K-T impact glasses</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Blum, Joel D.; Chamberlain, C. Page; Hingston, Michael P.; Koeberl, Christian</p> <p>1993-01-01</p> <p>Strontium and oxygen isotope analyses were performed on 8 samples from the M-1, M-3, and M-4 <span class="hlt">cores</span> recently <span class="hlt">drilled</span> at the Manson impact structure. The samples were three elastic sedimentary rocks (of probable Cretaceous age) which occurred as clasts within the sedimentary clast breccia, two samples of crystalline rock breccia matrix, and three samples of dolomite and limestone. The Sr-87/Sr-86 (corrected to 65 Ma) ratios were much higher than those in impact glasses from the Haitian Cretaceous-Tertiary (K-T) boundary. Isotope mixing calculations demonstrate that neither the silicate or carbonate rocks analyzed from the Manson crater, or mixtures of these rocks are appropriate source materials for the Haitian impact glasses. However, the Sr-87/Sr-86 (65Ma) ratio and delta O-18 value of the Ca-rich Haitian glasses are well reproduced by mixtures of Si-rich Haitian glass with platform carbonate of K-T age.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=19700000575&hterms=oil+drill&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Doil%2Bdrill"><span id="translatedtitle">Metal <span class="hlt">drilling</span> with portable hand <span class="hlt">drills</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Edmiston, W. B.; Harrison, H. W.; Morris, H. E.</p> <p>1970-01-01</p> <p>Study of metal <span class="hlt">drilling</span> solves problems of excessive burring, oversized holes, and out-of-round holes. Recommendations deal with using the proper chemical coolants, applying the coolants effectively, employing cutting oils, and dissipating the heat caused by <span class="hlt">drilling</span>.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://repository.tamu.edu/handle/1969.1/173"><span id="translatedtitle"><span class="hlt">Drilling</span> optimization using <span class="hlt">drilling</span> simulator software</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Salas Safe, Jose Gregorio</p> <p>2004-09-30</p> <p>the results of using <span class="hlt">drilling</span> simulator software called <span class="hlt">Drilling</span> Optimization Simulator (DROPS®) in the evaluation of the Aloctono block, in the Pirital field, eastern Venezuela. This formation is characterized by very complex geology, containing faulted...</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/1016721"><span id="translatedtitle">Optimizing <span class="hlt">drilling</span> performance using a selected <span class="hlt">drilling</span> fluid</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Judzis, Arnis (Salt Lake City, UT); Black, Alan D. (Coral Springs, FL); Green, Sidney J. (Salt Lake City, UT); Robertson, Homer A. (West Jordan, UT); Bland, Ronald G. (Houston, TX); Curry, David Alexander (The Woodlands, TX); Ledgerwood, III, Leroy W. (Cypress, TX)</p> <p>2011-04-19</p> <p>To improve <span class="hlt">drilling</span> performance, a <span class="hlt">drilling</span> fluid is selected based on one or more criteria and to have at least one target characteristic. <span class="hlt">Drilling</span> equipment is used to <span class="hlt">drill</span> a wellbore, and the selected <span class="hlt">drilling</span> fluid is provided into the wellbore during <span class="hlt">drilling</span> with the <span class="hlt">drilling</span> equipment. The at least one target characteristic of the <span class="hlt">drilling</span> fluid includes an ability of the <span class="hlt">drilling</span> fluid to penetrate into formation cuttings during <span class="hlt">drilling</span> to weaken the formation cuttings.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://kuscholarworks.ku.edu/handle/1808/17040"><span id="translatedtitle">Alteration of hyaloclastites in the HSDP 2 Phase 1 <span class="hlt">Drill</span> <span class="hlt">Core</span>: 2. Mass balance of the conversion of sideromelane to palagonite and chabazite</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Walton, Anthony W.; Schiffman, P.</p> <p>2003-05-03</p> <p>ro m el an e R 04 59 3 36 31 .1 (1 10 6. 8) H ya lo cl as ti te In ci pi en t N on e ob se rv ed V er y th in , fa in tl y bi re fr in ge nt gr ai n co at in gs R 04 66 1. 1 to 1. 2 40 22 .2 (1 22 6. 0) H ya lo cl as ti te In ci pi en t T ub ul es.... Geochemistry <span class="hlt">Geophysics</span> Geosystems G3 walton and schiffman: alteration of hyaloclastites 10.1029/2002GC000368 4 of 31 T ab le 1. H ya lo cl as ti te S am pl es E xa m in ed D ur in g T hi s S tu dy a R un an d di st . be lo w ru n to p, ft S ub se a de pt h, ft...</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/6577745"><span id="translatedtitle">Old Maid Flat geothermal exploratory hole No. 7A <span class="hlt">drilling</span> and completion report</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Not Available</p> <p>1981-02-01</p> <p><span class="hlt">Drilling</span> and testing efforts for a 6000-foot geothermal exploratory hole on the western approaches to Mount Hood, near Portland, Oregon were completed. The intent of the <span class="hlt">drilling</span> was to encounter a hydrothermal reservoir in a postulated fracture system and confirm the existence of a moderate-temperature (200/sup 0/F) geothermal resource in the Old Main Flat (OMF) vicinity of Mount Hood. The exploratory hole, OMF No. 7A, was completed to a total depth of 6027 feet in 54 days using conventional rotary <span class="hlt">drilling</span> techniques. The hole was found to be incapable of producing fluids with the desired temperatures. A maximum hole temperature of about 235/sup 0/F was recorded at total depth and a temperature gradient of about 3.3/sup 0/F/100 feet was exhibited over the lower 1000 feet of hole. A variety of technical data, including physical samples such as <span class="hlt">cores</span>, cuttings, and borehole fluids, plus <span class="hlt">geophysical</span> well logs were acquired. Data analyses are continuing, with results to be made available through future separate reports.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=20150009160&hterms=rotary&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3Drotary"><span id="translatedtitle">Results from Testing of Two Rotary Percussive <span class="hlt">Drilling</span> Systems</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Kriechbaum, Kristopher; Brown, Kyle; Cady, Ian; von der Heydt, Max; Klein, Kerry; Kulczycki, Eric; Okon, Avi</p> <p>2010-01-01</p> <p>The developmental test program for the MSL (Mars Science Laboratory) rotary percussive <span class="hlt">drill</span> examined the e ect of various <span class="hlt">drill</span> input parameters on the <span class="hlt">drill</span> pene- tration rate. Some of the input parameters tested were <span class="hlt">drill</span> angle with respect to gravity and percussive impact energy. The suite of rocks tested ranged from a high strength basalt to soft Kaolinite clay. We developed a hole start routine to reduce high sideloads from bit walk. The ongoing development test program for the IMSAH (Integrated Mars Sample Acquisition and Handling) rotary percussive corer uses many of the same rocks as the MSL suite. An additional performance parameter is <span class="hlt">core</span> integrity. The MSL development test <span class="hlt">drill</span> and the IMSAH test <span class="hlt">drill</span> use similar hardware to provide rotation and percussion. However, the MSL test <span class="hlt">drill</span> uses external stabilizers, while the IMSAH test <span class="hlt">drill</span> does not have external stabilization. In addition the IMSAH <span class="hlt">drill</span> is a <span class="hlt">core</span> <span class="hlt">drill</span>, while the MSL <span class="hlt">drill</span> uses a solid powdering bit. Results from the testing of these two related <span class="hlt">drilling</span> systems is examined.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/ofr79585"><span id="translatedtitle">Analysis of borehole <span class="hlt">geophysical</span> information across a uranium deposit in the Jackson Group, Karnes County, Texas</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Daniels, Jeffrey J.; Scott, James Henry; Smith, Bruce D.</p> <p>1979-01-01</p> <p>Borehole <span class="hlt">geophysical</span> studies across a uranium deposit in the Jackson Group, South Texas, show the three geochemical environments often associated with uranium roll-type deposits: an altered (oxidized) zone, an ore zone, and an unaltered (reduced) zone. Mineralogic analysis of the total sulfides contained in the <span class="hlt">drill</span> <span class="hlt">core</span> shows only slight changes in the total sulfide content among the three geochemical regimes. However, induced polarization measurements on the <span class="hlt">core</span> samples indicate that samples obtained from the reduced side of the ore zone are more electrically polarizable than those from the oxidized side of the ore zone, and therefore probably contain more pyrite. Analysis of the clay-size fraction in <span class="hlt">core</span> samples indicates that montmorillonite is the dominant clay mineral. High resistivity values within the ore zone indicate the presence of calcite cement concentrations that are higher than those seen outside of the ore zone. Between-hole resistivity and induced polarization measurements show the presence of an extensive zone of calcite cement within the ore zone, and electrical polarizable material (such as pyrite) within and on the reduced side of the ore zone. A quantitative analysis of the between-hole resistivity data, using a layered-earth model, and a qualitative analysis of the between-hole induced polarization measurements showed that mineralogic variations among the three geochemical environments were more pronounced than were indicated by the <span class="hlt">geophysical</span> and geologic well logs. Uranium exploration in the South Texas Coastal Plain area has focused chiefly in three geologic units: the Oakville Sandstone, the Catahoula Tuff, and the Jackson Group. The Oakville Sandstone and the Catahoula Tuff are of Miocene age, and the Jackson Group is of Eocene age (Eargle and others, 1971). Most of the uranium mineralization in these formations is low grade (often less than 0.02 percent U3O8) and occurs in shallow deposits that are found by concentrated exploratory <span class="hlt">drilling</span> programs. The sporadic occurrence of these deposits makes it desirable to develop borehole <span class="hlt">geophysical</span> techniques that will help to define the depositional environments of the uranium ore, which is characterized by geochemical changes near the uranium deposits. Geochemical changes are accompanied by changes in the physical characteristics of the rocks that can be detected with borehole <span class="hlt">geophysical</span> tools. This study is concerned with a uranium deposit within the Jackson Group that is located just east of Karnes City, Tex. Five holes were <span class="hlt">drilled</span> on this property to obtain borehole <span class="hlt">geophysical</span> data and <span class="hlt">cores</span>. The <span class="hlt">cores</span> were analyzed for mineralogic and electrical properties. The borehole <span class="hlt">geophysical</span> information at this property included induced polarization, resistivity, gamma-gamma density, neutron-neutron, gamma-ray, caliper, and single-point-resistance logs. Between-hole resistivity and induced polarization measurements were made between hole pairs across the ore deposit and off the ore deposit.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6983388"><span id="translatedtitle">Measurement-while-<span class="hlt">drilling</span> essential to <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Fontenot, J.M.; Rao, M.V.</p> <p>1988-03-28</p> <p>During the next decade, measurement-while-<span class="hlt">drilling</span> (MWD) technology will mature and become an essential part of <span class="hlt">drilling</span> and formation evaluation. Especially in high angle/horizontal wells, more effective <span class="hlt">drilling</span> and valuation will be possible. This concluding article in a series that began Jan. 25 focuses on limitations to using MWD that will be overcome. The use of MWD products and services will be expanded to include smaller holes, higher temperatures, faster and more frequent signals, more downhole memory, and additional sensors. These advances will lead to better formation evaluation, safer <span class="hlt">drilling</span>, and increased <span class="hlt">drilling</span> efficiency.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li class="active"><span>14</span></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_14 --> <div id="page_15" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li class="active"><span>15</span></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="281"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/70017167"><span id="translatedtitle">Tecuamburro Volcano, Guatemala: exploration geothermal gradient <span class="hlt">drilling</span> and results</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Goff, S.J.; Goff, F.; Janik, C.J.</p> <p>1992-01-01</p> <p>Results of geological, volcanological, hydrogeochemical, and <span class="hlt">geophysical</span> field studies conducted in 1988 and 1989 at the Tecuamburro geothermal site, Guatemala, indicate that there is a substantial shallow heat source beneath the area of youngest volcanism. Gases from acid-sulfate springs near Laguna Ixpaco consistently yield maximum estimated subsurface temperatures of 300??C. To obtain information on subsurface temperatures and temperature gradients, stratigraphy, fracturing, hydrothermal alteration, and hydrothermal fluids, a geothermal gradient <span class="hlt">core</span> hole (TCB-1) was <span class="hlt">drilled</span> to 808 m low on the northern flank of the Tecuamburro Volcano complex. The hole is located 300 m south of a 300m-diameter phreatic crater. Laguna Ixpaco, dated at 2910 years. TCB-1 temperature logs do not indicate isothermal conditions at depth and the calculated thermal gradient from 500-800 m is 230??C/km. Bottom hole temperature is close to 240??C. Calculated heat flow values are around 350-400 mW/m2. Fluid-inclusion and secondary-alteration studies indicate that veins and secondary minerals were formed at temperatures equal to or slightly less than present temperatures; thus, the Tecuamburro geothermal system may still be heating up. The integration of results from the TCB-1 gradient <span class="hlt">core</span> hole with results from field studies provides strong evidence that the Tecuamburro area holds great promise for geothermal resource development. ?? 1992.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/70022251"><span id="translatedtitle">Anisotropy of magnetic susceptibility as a tool for recognizing <span class="hlt">core</span> deformation: reevaluation of the paleomagnetic record of Pleistocene sediments from <span class="hlt">drill</span> hole OL-92, Owens Lake, California</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Rosenbaum, Joseph; Reynolds, Richard T.; Smoot, Joseph; Meyer, Robert</p> <p>2000-01-01</p> <p>At Owens Lake, California, paleomagnetic data document the Matuyama/Brunhes polarity boundary near the bottom of a 323-m <span class="hlt">core</span> (OL-92) and display numerous directional fluctuations throughout the Brunhes chron. Many of the intervals of high directional dispersion were previously interpreted to record magnetic excursions. For the upper ~120 m, these interpretations were tested using the anisotropy of magnetic susceptibility (AMS), which typically defines a subhorizontal planar fabric for sediments deposited in quiet water. AMS data from intervals of deformed <span class="hlt">core</span>, determined from detailed analysis of sedimentary structures, were compared to a reference AMS fabric derived from undisturbed sediment. This comparison shows that changes in the AMS fabric provide a means of screening <span class="hlt">core</span> samples for deformation and the associated paleomagnetic record for the adverse effects of distortion. For that portion of <span class="hlt">core</span> OL-92 studied here (about the upper 120 m), the combined analyses of sedimentary structures and AMS data demonstrate that most of the paleomagnetic features, previously interpreted as geomagnetic excursions, are likely the result of <span class="hlt">core</span> deformation.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2004AGUFM.B32B..03N"><span id="translatedtitle">New Discoveries From The Archean Biosphere <span class="hlt">Drilling</span> Project (ABDP)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nedachi, M.</p> <p>2004-12-01</p> <p>The Archean Biosphere <span class="hlt">Drilling</span> Project (ABDP), an international scientific <span class="hlt">drilling</span> project involving scientists from the USA, Australia and Japan, was initiated in Pilbara Craton, Western Australia. The scientific objectives of the ABDP are the identification of microfossils and biomarkers, the clarification of geochemical environment of the early Earth, and the understanding of <span class="hlt">geophysical</span> contribution to the co-evolution of life and environment. Through 2003 and 2004 activities, we have <span class="hlt">drilled</span> 150 _| 300 m deep holes to recover _gfresh_h (modern weathering-free) geologic formations that range from 3.5 to 2.7 Ga in age. The <span class="hlt">drilling</span> targets were: (1) 3.46 Ga Towers Formation, (2) mid-Archean Mosquito Formation, (3) 2.77 Ga Mt Roe Basalt, (4) 2.76 Ga Tumbiana Formation, (5) 2.74 Ga Hardey Formation. The initial investigations on the ABDP <span class="hlt">drill</span> <span class="hlt">cores</span> by Japanese members have already produced many exciting and interesting data and observations. 3.46 Ga Marble Bar Jasper could provide clues to the argument about the early photosynthetic cyanobacteria that have produced free oxygen and have evolved the oxygen level on the earth. There have been many ideas how the hematite in jasper was formed. Our most important discoveries are the confirmations that hematite, magnetite and siderite precipitated separately as primary minerals, and that there is a remaining texture which resembles microfossil using FE-SEM, ESCA, Laser-Raman and cathodoluminescence. Taking into account the carbon isotopic ratios of remains from _|25 to _|40 permil, these iron oxides might be biogenic. We need to identify the iron bacteria in detail to deduce the early earth_fs surface environment. In addition, the black shale of Apex Basalt overlying Marble Bar Jasper contains organic carbon from 0.7 to 5.2 percent, and the carbon isotopic ratio of which is from -26 to -30 per mil, suggesting that various microbes inhabited in the early Archean ocean. 2.77 Ga Mt Roe Basalt, which is composed of basaltic lavas interbedded with tuffs, clastic sediment and minor evaporites, well preserves the primary biogeochemical, geochemical and <span class="hlt">geophysical</span> phenomena. The discovery of black shale with sulfide nodules is worthy of special attention. Our study suggests that the following succession of events occurred more than once, (1) eruption of amygdaloidal basaltic lava followed by eruption of tuff into shallower water, (2) deposition of sandstone and black shale, and (3) concurrent hydrothermal activity with reduced fluids altered the tuff and the lowermost clastic sediments. The extremely light carbon isotopic ratios suggest the activities of methanogene in hydrothermal veinlets and methanotroph in black shale. In addition, the wide range of sulfur isotopic ratio in black shale suggests activity of co-existing sulfate-reducing bacteria in the black shale. Occasional presence of sandstone, especially in late stage of clastic sedimentation, suggests the sedimentation near coastal environment. Stromatolite-like microtexture in the sandstone suggests the existence of photosynthetic microbes, which is supported by heavy carbon isotopic ratios (up to _|25 permil) and by the signals of hopanoids biomarker. The three dimensional geochemical data suggest the existence of marine environment from oxic at shallow site to euxinic at the deeper site. Paleomagnetic analyses suggest the episodic initiation of the earth's dynamo at about 3.5 Ga and the increase of it's momentum since at least 2.77 Ga. Taking into account the biogeochemical evidences confirmed from other ABDP <span class="hlt">cores</span>, the increase of geomagnetic intensity might have accelerated the diversification of early life.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://dspace.mit.edu/handle/1721.1/77790"><span id="translatedtitle"><span class="hlt">Geophysical</span> imaging methods for analysis of the Krafla Geothermal Field, NE Iceland</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Parker, Beatrice Smith</p> <p>2012-01-01</p> <p>Joint <span class="hlt">geophysical</span> imaging techniques have the potential to be reliable methods for characterizing geothermal sites and reservoirs while reducing <span class="hlt">drilling</span> and production risks. In this study, we applied a finite difference ...</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/21017105"><span id="translatedtitle">Rotary blasthole <span class="hlt">drilling</span> update</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Fiscor, S.</p> <p>2008-02-15</p> <p>Blasthole <span class="hlt">drilling</span> rigs are the unsung heroes of open-pit mining. Recently manufacturers have announced new tools. Original equipment manufactures (OEMs) are making safer and more efficient <span class="hlt">drills</span>. Technology and GPS navigation systems are increasing <span class="hlt">drilling</span> accuracy. The article describes features of new pieces of equipment: Sandvik's DR460 rotary blasthole <span class="hlt">drill</span>, P & H's C-Series <span class="hlt">drills</span> and Atlas Copco's Pit Viper PV275 multiphase rotary blasthole <span class="hlt">drill</span> rig. <span class="hlt">Drill</span>Nav Plus is a blasthole navigation system developed by Leica Geosystems. 5 photos.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2013EGUGA..15.8203F"><span id="translatedtitle">Spectrum Gamma Ray bore hole logging while tripping with the sea floor <span class="hlt">drill</span> rig MARUM-MeBo</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Freudenthal, Tim; Steinke, Stephan; Mohtadi, Mahyar; Hebbeln, Dierk; Wefer, Gerold</p> <p>2013-04-01</p> <p>The robotic Sea Floor <span class="hlt">Drill</span> Rig MARUM-MeBo developed at the MARUM Center for Marine Environmental Sciences at the University of Bremen was used to retrieve long sediment <span class="hlt">cores</span> at two sites in the northern South China Sea. Both sites are located in about 1000 m water depth in southeasterly and southwesterly direction of the Pearl River mouth, respectively. South East Asian Monsoon variability controls terrigenous material transport by rivers into the South China Sea. The Pearl River is one of the largest rivers of the region that discharges into the northern South China Sea. The terrigenous fraction of marine sediments of the northern South China Sea therefore provides an excellent archive for reconstructing past variability of the South East Asian Monsoon system. In analogy to the <span class="hlt">drilling</span> strategy within the Integrated Ocean <span class="hlt">Drilling</span> Program IODP multiple holes were <span class="hlt">drilled</span> in order to generate continuous spliced records at both sites. Overall the MARUM-MeBo <span class="hlt">drilled</span> 374 m during 5 deployments with a maximum <span class="hlt">drilling</span> depth of 80.85 m and an average <span class="hlt">core</span> recovery of 94 %. Here we present first results of bore hole logging conducted during 4 of the 5 deployments with a spectrum gamma ray (SGR) probe adapted for the use with MARUM-MeBo. This probe is an autonomous slim hole probe that is used in the logging while tripping mode. This method is especially favorable for remote controlled <span class="hlt">drilling</span> and logging operation. The probe is equipped with its own energy source and data storage. The probe is lowered into the <span class="hlt">drill</span> string after the target wire-line <span class="hlt">coring</span> depth is reached and after the last inner <span class="hlt">core</span> barrel has been retrieved. When the probe has landed on the shoulder ring at the bottom of the hole, the <span class="hlt">drill</span> string is pulled out and disassembled. The probe, while being raised with the <span class="hlt">drill</span> string, continuously measures the <span class="hlt">geophysical</span> properties of the in situ sediments and rocks. Since the bore hole is stabilized during the tripping process by the <span class="hlt">drill</span> string in the vicinity of the logging probe, logging while tripping can also be used for unstable bore hole conditions e.g. in unconsolidated sediments. At both <span class="hlt">drill</span> sites two profiles were measured during separate deployments of the MeBo. A close correlation of the profiles was observed at both sites. Natural gamma ray intensity varies between 38 and 91 API. The variations in natural gamma ray intensity are mainly attributed to changes in concentrations of potassium (0,5 - 1,6 %) and thorium (3,6 - 13,2 ppm), while the concentrations of uranium are fairly low (1,2 - 3,2 ppm). Clays are the main host minerals for thorium in marine sediments. Potassium may be incorporated both into clay and feldspar minerals. The variability in the natural gamma ray intensity can therefore be interpreted as an indicator of changes in terrestrial sediment input into the South China Sea. The observation of severe variability of the K/Th ratio and its correlation with sedimentary calcium content measured by XRF-scanning points to the fact that not only changes in the amount but also changes in the composition of the terrigenous fraction is elucidated by the SGR bore hole logging and will help reconstructing past changes in the South East Asian monsoon system.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/52660236"><span id="translatedtitle">Investigating Increases in Spectral Gamma Ray Signals Observed From Wireline Logging Through Correlation With <span class="hlt">Core</span> Geochemical Analyses: Integrated Ocean <span class="hlt">Drilling</span> Program (IODP) Expedition 310, Tahiti Sea Level</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>J. Inwood; T. Brewer</p> <p>2008-01-01</p> <p>The last deglacial reef sequence in Tahiti consists of a series of successive reef terraces seaward of the living barrier reef. IODP Expedition 310 recovered <span class="hlt">core</span> from 37 boreholes which shows that the reef terraces are composed of two major lithological units (i) a last deglacial carbonate sequence and (ii) an older Pleistocene unit. Each sequence comprises of a series</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/55031518"><span id="translatedtitle">Why <span class="hlt">Drill</span> Here? Teaching to Build Student Understanding of the Role Sediment <span class="hlt">Cores</span> from Polar Regions play in Interpreting Climate Change</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>K. S. Pound; K. St. John; L. A. Krissek; M. H. Jones; R. M. Leckie; E. J. Pyle</p> <p>2008-01-01</p> <p>That the ocean basins provide a record of past global climate changes through their sediment <span class="hlt">cores</span> is often a surprise or novel idea for students. Equally surprising to many students is the fact that current research is being undertaken in remote polar regions, even though sedimentary records already exist from the low and mid latitude regions. Students are often also</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/471403"><span id="translatedtitle">Geothermal <span class="hlt">drilling</span> technology update</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Glowka, D.A.</p> <p>1997-04-01</p> <p>Sandia National Laboratories conducts a comprehensive geothermal <span class="hlt">drilling</span> research program for the US Department of Energy, Office of Geothermal Technologies. The program currently includes seven areas: lost circulation technology, hard-rock <span class="hlt">drill</span> bit technology, high-temperature instrumentation, wireless data telemetry, slimhole <span class="hlt">drilling</span> technology, Geothermal <span class="hlt">Drilling</span> Organization (GDO) projects, and <span class="hlt">drilling</span> systems studies. This paper describes the current status of the projects under way in each of these program areas.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5617844"><span id="translatedtitle"><span class="hlt">Drilling</span> tool</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kessler, J.</p> <p>1983-08-30</p> <p>A tool, which makes an undercut in the surface surrounding a <span class="hlt">drill</span> hole in a layer of coal, has a plate which abuts against the surface at the inner end of the hole when the tool is inserted and which is installed at the front end of a rotary tubular guide for two bit holders constituting one-armed levers and having front portions provided with bits and being movable radially outwardly through windows in the guide. The rear portions of the holders are coupled to the front part of a reciprocal rotary shank which can be moved forwardly to expel the bits from the guide while moving the holder forwardly. When the shank is retracted, the bits are withdrawn into the guide. Such movements of the bits are caused by a transverse pin mounted in the guide and extending through elongated cam groove in the median portions of the holders. The configuration of surfaces flanking the cam grooves is such that the bits move outwardly during a first stage of forward movement of the shank relative to the guide and the bits thereupon remain in extended positions and make a cylindrical portion of the undercut in the surface surrounding the hole during the last stage of axial movement of the shank the guide. The tool is thereupon withdrawn and replaced with an anchor bolt which can be expanded against the surface portion surrounding the undercut and serves as a supporting or holding device.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2001AGUSM...V62A07N"><span id="translatedtitle">Scientific <span class="hlt">Drilling</span> and Deep Earth Observation</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nielson, D. L.</p> <p>2001-05-01</p> <p>The concept of scientific <span class="hlt">drilling</span> is expanding from an activity focused on the collection of samples from the earth's crust to include long-term observation of earth processes. There are two aspects that have influenced this change. First, <span class="hlt">drilling</span> is expensive, and it is necessary to maximize the scientific value of holes <span class="hlt">drilled</span>. In the private sector, wells represent capital investments that are expected to produce returns for 30 years or more. With deep wells costing more than a million dollars to <span class="hlt">drill</span>, it is imperative that the scientific community should plan on long-term observation. Examples of this are the monitoring being planned on the Long Valley Scientific <span class="hlt">core</span> hole and the San Andreas Observatory at Depth. Plans for monitoring at the Hawaii Scientific <span class="hlt">Drilling</span> Program hole on Hawaii are in the initial stages. Second, technology is now available to engineer earth observatories with multiple completions having different observational tasks. Deep boreholes provide access to the subsurface, while directional <span class="hlt">drilling</span> techniques can be used to deploy instrumentation outside the main access well. This allows for the isolation of different instrumentation packages from the influence of the main borehole. We also believe that assemblies similar to <span class="hlt">core</span> barrels can be used to deliver instrument packages both during and following <span class="hlt">drilling</span> operations.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/14094"><span id="translatedtitle">Advanced <span class="hlt">Drilling</span> through Diagnostics-White-<span class="hlt">Drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>FINGER,JOHN T.; GLOWKA,DAVID ANTHONY; LIVESAY,BILLY JOE; MANSURE,ARTHUR J.; PRAIRIE,MICHAEL R.</p> <p>1999-10-07</p> <p>A high-speed data link that would provide dramatically faster communication from downhole instruments to the surface and back again has the potential to revolutionize deep <span class="hlt">drilling</span> for geothermal resources through Diagnostics-While-<span class="hlt">Drilling</span> (DWD). Many aspects of the <span class="hlt">drilling</span> process would significantly improve if downhole and surface data were acquired and processed in real-time at the surface, and used to guide the <span class="hlt">drilling</span> operation. Such a closed-loop, driller-in-the-loop DWD system, would complete the loop between information and control, and greatly improve the performance of <span class="hlt">drilling</span> systems. The main focus of this program is to demonstrate the value of real-time data for improving <span class="hlt">drilling</span>. While high-rate transfer of down-hole data to the surface has been accomplished before, insufficient emphasis has been placed on utilization of the data to tune the <span class="hlt">drilling</span> process to demonstrate the true merit of the concept. Consequently, there has been a lack of incentive on the part of industry to develop a simple, low-cost, effective high-speed data link. Demonstration of the benefits of DWD based on a high-speed data link will convince the <span class="hlt">drilling</span> industry and stimulate the flow of private resources into the development of an economical high-speed data link for geothermal <span class="hlt">drilling</span> applications. Such a downhole communication system would then make possible the development of surface data acquisition and expert systems that would greatly enhance <span class="hlt">drilling</span> operations. Further, it would foster the development of downhole equipment that could be controlled from the surface to improve hole trajectory and <span class="hlt">drilling</span> performance. Real-time data that would benefit <span class="hlt">drilling</span> performance include: bit accelerations for use in controlling bit bounce and improving rock penetration rates and bit life; downhole fluid pressures for use in the management of <span class="hlt">drilling</span> hydraulics and improved diagnosis of lost circulation and gas kicks; hole trajectory for use in reducing directional <span class="hlt">drilling</span> costs; and downhole weight-on-bit and <span class="hlt">drilling</span> torque for diagnosing <span class="hlt">drill</span> bit performance. In general, any measurement that could shed light on the downhole environment would give us a better understanding of the <span class="hlt">drilling</span> process and reduce <span class="hlt">drilling</span> costs.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2007AGUSM.U33A..07F"><span id="translatedtitle">Deep <span class="hlt">Drilling</span> Into the Chicxulub Impact Crater: Pemex Oil Exploration Boreholes Revisited</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Fucugauchi, J. U.; Perez-Cruz, L.</p> <p>2007-05-01</p> <p>The Chicxulub structure was recognized in the 1940´s from gravity anomalies in oil exploration surveys by Pemex. <span class="hlt">Geophysical</span> anomalies occur over the carbonate platform in NW Yucatan, where density and magnetic susceptibility contrasts with the carbonates suggested a buried igneous complex or basement uplift. The exploration program developed afterwards included several boreholes, starting with the Chicxulub-1 in 1952 and eventually comprising eight deep boreholes completed through the 1970s. The investigations showing Chicxulub as a large impact crater formed at the K/T boundary have relayed on the Pemex decades-long exploration program. Despite frequent reference to Pemex information, original data have not been openly available for detailed evaluation and incorporation with results from recent efforts. Logging data and <span class="hlt">core</span> samples remain to be analyzed, reevaluated and integrated in the context of recent marine, aerial and terrestrial <span class="hlt">geophysical</span> surveys and the <span class="hlt">drilling/coring</span> projects of UNAM and ICDP. In this presentation we discuss the paleontological data, stratigraphic columns and <span class="hlt">geophysical</span> logs for the Chicxulub-1 (1582m), Sacapuc-1 (1530m), Yucatan-6 (1631m) and Ticul-1 (3575m) boreholes. These boreholes remain the deepest ones <span class="hlt">drilled</span> in Chicxulub and the only ones providing samples of the melt-rich breccias and melt sheet. Other boreholes include the Y1 (3221m), Y2 (3474m), Y4 (2398m) and Y5A (3003m), which give information on pre-impact stratigraphy and crystalline basement. We concentrate on log and microfossil data, stratigraphic columns, lateral correlation, integration with UNAM and ICDP borehole data, and analyses of sections of melt, impact breccias and basal Paleocene carbonates. Current plans for deep <span class="hlt">drilling</span> in Chicxulub crater focus in the peak ring zone and central sector, with proposed marine and on-land boreholes to the IODP and ICDP programs. Future ICDP borehole will be located close to Chicxulub-1 and Sacapuc-1, which intersected the impact breccias at about 1 km and the melt and melt- rich breccias at some 1.3-1.4 km.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2008AGUFM.T14A..05T"><span id="translatedtitle">NanTroSEIZE Stage 1: Overview of Results From the Nankai Trough Seismogenic Zone IODP <span class="hlt">Drilling</span> Project</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tobin, H.; Kinoshita, M.; Ashi, J.; Lallemant, S.; Kimura, G.; Screaton, E.; Scientific Party, I.</p> <p>2008-12-01</p> <p>IODP Expeditions 314-316 took place over five months of continuous <span class="hlt">drilling</span> operations in the off-Kumano region of the Nankai Trough subduction zone (September, 2007 - February, 2008). This effort was both the maiden scientific voyage of the new <span class="hlt">drilling</span> vessel Chikyu and the first stage in the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE), a multi-year effort designed to investigate fault mechanics and seismogenesis along a subduction megathrust through direct sampling, in situ measurements, and long- term monitoring. The principal elements of the larger project include (a) the 2006 3D seismic survey of the intended transect, (b) four planned stages of IODP <span class="hlt">drilling</span>, sampling, and downhole measurements, and (c) long-term real-time monitoring of the plate interface in cabled borehole observatories. The three Stage 1 expeditions accomplished <span class="hlt">drilling</span>, logging, and sampling of 8 sites as deep as 1400 meters below the sea floor. During Expedition 314, we obtained a comprehensive suite of <span class="hlt">geophysical</span> logs at several sites along a transect focused on the up-dip transition from seismic to aseismic fault behavior, using state-of-the-art logging-while-<span class="hlt">drilling</span> (LWD) techniques and <span class="hlt">drilling</span> to depths of 400 to 1400 m. Expeditions 315 and 316 were devoted to <span class="hlt">coring</span> at these same sites, plus two others. Integrated results of all three expeditions shed light on the lithologies, physical and hydrogeological properties, structural features, tectonic history, geochemical and biological systems, and present-day state of stress to 1.5 km below the seafloor. One highlight of log and <span class="hlt">cores</span> results is evidence for the orientation of present-day principal stresses from borehole breakouts, and paleostress from fractures and faults in <span class="hlt">cores</span>. The orientation of the maximum horizontal stress axis (SHmax) from breakouts across the outer wedge is consistently perpendicular to the local strike of major structure, but is subparallel to strike in the forearc basin/inner wedge domain, consistent with a compressional to transpressional stress state in the outer wedge and an extensional stress state in the inner wedge. Further results include: (a) contrasting internal structure of recently active faults depending on their apparent structural, burial, and or diagenetic history, (b) timing and evolution of the major forearc basin and "mega-splay" thrust system activity, (c) progressive disruption of sedimentary strata with distance into the wedge, and (d) interaction of syn-deformational slope deposits with recent thrust motion and slope failure. These first expeditions in NanTroSEIZE set the stage for coming deep <span class="hlt">drilling</span> efforts to reach the seismogenic zone, scheduled to begin in March, 2009.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://hdl.handle.net/2060/20050166970"><span id="translatedtitle">Searching for Life Underground: An Analysis of Remote Sensing Observations of a <span class="hlt">Drill</span> <span class="hlt">Core</span> from Rio Tinto, Spain for Mineralogical Indications of Biological Activity</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Battler, M.; Stoker, C.</p> <p>2005-01-01</p> <p>Water is unstable on the surface of Mars, and therefore the Martian surface is not likely to support life. It is possible, however, that liquid water exists beneath the surface of Mars, and thus life might also be found in the subsurface. Subsurface life would most likely be microbial, anaerobic, and chemoautotrophic; these types of biospheres on Earth are rare, and not well understood. Finding water and life are high priorities for Mars exploration, and therefore it is important that we learn to explore the subsurface robotically, by <span class="hlt">drilling</span>. The Mars Analog Rio Tinto Experiment (MARTE), has searched successfully for a subsurface biosphere at Rio Tinto, Spain [1,2,3,4]. The Rio Tinto study site was selected to search for a subsurface biosphere because the extremely low pH and high concentrations of elements such as iron and copper in the Tinto River suggest the presence of a chemoautotrophic biosphere in the subsurface beneath the river. The Rio Tinto has been recognized as an important mineralogical analog to the Sinus Meridiani site on Mars [5].</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/52987793"><span id="translatedtitle"><span class="hlt">Coring</span> Into Earth's Past with Real Scientific Data</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>M. Sutton</p> <p>2007-01-01</p> <p>The session takes participants on a journey through Earth's past using sediment <span class="hlt">core</span> data from decades of seafloor <span class="hlt">drilling</span>. The Integrated Ocean <span class="hlt">Drilling</span> Program includes a database of field reports and data for thousands of miles of sediment <span class="hlt">cores</span> <span class="hlt">drilled</span> from the seafloor of Earth's oceans. An array of scientists are mastering an integrated approach to studying these <span class="hlt">cores</span>, including</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NSDL&redirectUrl=http://nicl.usgs.gov/"><span id="translatedtitle">National Ice <span class="hlt">Core</span> Laboratory</span></a></p> <p><a target="_blank" href="http://nsdl.org/nsdl_dds/services/ddsws1-1/service_explorer.jsp">NSDL National Science Digital Library</a></p> <p>USGS</p> <p></p> <p>This facility stores, curates and studies ice <span class="hlt">cores</span> recovered from glaciers from around the world. The site provides a photo gallery and description about each step of the process of <span class="hlt">drilling</span>, transporting and analyzing the <span class="hlt">core</span>. There is also a database of basic information about each <span class="hlt">core</span> held at the laboratory and links to global change research information.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2013EGUGA..15.2410T"><span id="translatedtitle">New approaches to subglacial bedrock <span class="hlt">drilling</span> technology</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Talalay, Pavel; Sun, Youhong; Zhao, Yue; Xue, Jun; Chen, Chen; Markov, Alexey; Xu, Huiwen; Gong, Wenbin; Han, Wei; Zheng, Zhichuan; Cao, Pinlu; Wang, Rusheng; Zhang, Nan; Yu, Dahui; Fan, Xiaopeng; Hu, Zhengyi; Yang, Cheng; Han, Lili; Sysoev, Mikhail</p> <p>2013-04-01</p> <p><span class="hlt">Drilling</span> to bedrock of ice sheets and glaciers offers unique opportunities to research processes acting at the bed for paleo-climatic and paleo-environmental recording, basal sliding studies, subglacial geology and tectonics investigations, prospecting and exploration for minerals covered by ice. Retrieving bedrock samples under ice sheets and glaciers is a very difficult task. <span class="hlt">Drilling</span> operations are complicated by extremely low temperature at the surface of, and within glaciers, and by glacier flow, the absence of roads and infrastructures, storms, winds, snowfalls, etc. In order to penetrate through the ice sheet or glacier up to the depth of at least 1000 m and to pierce the bedrock to the depth of several meters from ice - bedrock boundary the development activity already has been started in Polar Research Center at Jilin University, China. All <span class="hlt">drilling</span> equipment (two 50-kW diesel generators, winch, control desk, fluid dumping station, etc.) is installed inside a movable sledge-mounted warm-keeping and wind-protecting <span class="hlt">drilling</span> shelter that has dimensions of 8.8 ×2.8 × 3.0 m. Mast has two positions: horizontal for transportation and vertical working position (mast height is 12 m). <span class="hlt">Drilling</span> shelter can be transported to the chosen site with crawler-tractor, aircraft or helicopter. In case of carriage by air the whole <span class="hlt">drilling</span> shelter was designed to be disassembled into pieces "small" enough to ship by aircraft. Weight and sizes of each component has been minimized to lower the cost of transportation and to meet weight restrictions for transportation. Total weight of <span class="hlt">drilling</span> equipment (without <span class="hlt">drilling</span> fluid) is near 15 tons. Expected time of assembling and preparing for <span class="hlt">drilling</span> is 2 weeks. If <span class="hlt">drilling</span> shelter is transported with crawler-tractor (for example, in Antarctic traverses) all equipment is ready to start <span class="hlt">drilling</span> immediately upon arrival to the site. To <span class="hlt">drill</span> through ice and bedrock a new, modified version of the cable-suspended electromechanical ice <span class="hlt">core</span> <span class="hlt">drill</span> is designed and tested. The expected average daily production of ice <span class="hlt">drilling</span> would be not less than 25 m/day. The lower part of the <span class="hlt">drill</span> is adapted for <span class="hlt">coring</span> bed-rock using special tooth diamond bit. Deep ice <span class="hlt">coring</span> requires a <span class="hlt">drilling</span> fluid in the borehole during operation in order to keep the hole open and to compensate the hydrostatic pressures acting to close it. At present there are no ideal low-temperature <span class="hlt">drilling</span> fluids as all of them are environmental and health hazardous substances. The new approaches of subglacial bedrock <span class="hlt">drilling</span> technology are connected with utilization of environmental friendly, low-toxic materials, e.g. low-molecular dimethyl siloxane oils or aliphatic synthetic ester of ESTISOL™ 140 type. They have suitable density-viscosity properties, and can be consider as a viable alternative for <span class="hlt">drilling</span> in glaciers and subglacial bedrock.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/866947"><span id="translatedtitle">Ultrasonic <span class="hlt">drilling</span> apparatus</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Duran, Edward L. (Santa Fe, NM); Lundin, Ralph L. (Los Alamos, NM)</p> <p>1989-01-01</p> <p>Apparatus attachable to an ultrasonic <span class="hlt">drilling</span> machine for <span class="hlt">drilling</span> deep holes in very hard materials, such as boron carbide, is provided. The apparatus utilizes a hollow spindle attached to the output horn of the ultrasonic <span class="hlt">drilling</span> machine. The spindle has a hollow <span class="hlt">drill</span> bit attached at the opposite end. A housing surrounds the spindle, forming a cavity for holding slurry. In operation, slurry is provided into the housing, and into the spindle through inlets while the spindle is rotating and ultrasonically reciprocating. Slurry flows through the spindle and through the hollow <span class="hlt">drill</span> bit to cleanse the cutting edge of the bit during a <span class="hlt">drilling</span> operation.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://hdl.handle.net/2060/20110004875"><span id="translatedtitle">Robotic Planetary <span class="hlt">Drill</span> Tests</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Glass, Brian J.; Thompson, S.; Paulsen, G.</p> <p>2010-01-01</p> <p>Several proposed or planned planetary science missions to Mars and other Solar System bodies over the next decade require subsurface access by <span class="hlt">drilling</span>. This paper discusses the problems of remote robotic <span class="hlt">drilling</span>, an automation and control architecture based loosely on observed human behaviors in <span class="hlt">drilling</span> on Earth, and an overview of robotic <span class="hlt">drilling</span> field test results using this architecture since 2005. Both rotary-drag and rotary-percussive <span class="hlt">drills</span> are targeted. A hybrid diagnostic approach incorporates heuristics, model-based reasoning and vibration monitoring with neural nets. Ongoing work leads to flight-ready <span class="hlt">drilling</span> software.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li class="active"><span>15</span></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_15 --> <div id="page_16" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li class="active"><span>16</span></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="301"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5786832"><span id="translatedtitle"><span class="hlt">Geophysical</span> and geochemical techniques for exploration of hydrocarbons and minerals. [389 US patents</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Sittig, M. (ed.)</p> <p>1980-01-01</p> <p>The detailed descriptive information in this book is based on 389 US patents that deal with <span class="hlt">geophysical</span> and geochemical techniques useful for the exploration of hydrocarbons and minerals. Where it was necessary to round out the complete technological picture, a few paragraphs from cited government reports have been included. These techniques are used in prospecting for oil, coal, oil shale, tar sand and minerals. The patents are grouped under the following chapters: geochemical prospecting; geobiological prospecting; <span class="hlt">geophysical</span> exploration; magnetic <span class="hlt">geophysical</span> prospecting; gravitational <span class="hlt">geophysical</span> prospecting; electrical <span class="hlt">geophysical</span> prospecting; nuclear <span class="hlt">geophysical</span> prospecting; seismic <span class="hlt">geophysical</span> prospecting; and exploratory well <span class="hlt">drilling</span>. This book serves a double purpose in that it supplies detailed technical information and can be used as a guide to the US patent literature in this field. By indicating all the information that is significant, and eliminating legal jargon and juristic phraseology, this book presents an advanced, industrially oriented review of modern methods of <span class="hlt">geophysical</span> and geochemical exploration techniques. (ATT)</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2012AGUFM.B43G0484I"><span id="translatedtitle"><span class="hlt">Drilling</span> Fluid Contamination during Riser <span class="hlt">Drilling</span> Quantified by Chemical and Molecular Tracers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Inagaki, F.; Lever, M. A.; Morono, Y.; Hoshino, T.</p> <p>2012-12-01</p> <p>Stringent contamination controls are essential to any type of microbiological investigation, and are particularly challenging in ocean <span class="hlt">drilling</span>, where samples are retrieved from hundreds of meters below the seafloor. In summer 2012, Integrated Ocean <span class="hlt">Drilling</span> Expedition 337 aboard the Japanese vessel Chikyu pioneered the use of chemical tracers in riser <span class="hlt">drilling</span> while exploring the microbial ecosystem of coalbeds 2 km below the seafloor off Shimokita, Japan. Contamination tests involving a perfluorocarbon tracer that had been successfully used during past riserless <span class="hlt">drilling</span> expeditions were complemented by DNA-based contamination tests. In the latter, likely microbial contaminants were targeted via quantitative polymerase chain reaction assays using newly designed, group-specific primers. Target groups included potential indicators of (a) <span class="hlt">drilling</span> mud viscosifiers (Xanthomonas, Halomonas), (b) anthropogenic wastewater (Bifidobacterium, Blautia, Methanobrevibacter), and (c) surface seawater (SAR 11, Marine Group I Archaea). These target groups were selected based on past evidence suggesting viscosifiers, wastewater, and seawater as the main sources of microbial contamination in <span class="hlt">cores</span> retrieved by ocean <span class="hlt">drilling</span>. Analyses of chemical and molecular tracers are in good agreement, and indicate microorganisms associated with mud viscosifiers as the main contaminants during riser <span class="hlt">drilling</span>. These same molecular analyses are then extended to subseafloor samples obtained during riserless <span class="hlt">drilling</span> operations. General strategies to further reduce the risk of microbial contamination during riser and riserless <span class="hlt">drilling</span> operations are discussed.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/483398"><span id="translatedtitle">Test report for <span class="hlt">drill</span> string seal pressure test</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>McCormick, J.F.</p> <p>1996-02-06</p> <p>A basic question was asked concerning the <span class="hlt">drill</span> string which is used in rotary Mode <span class="hlt">coring</span> operations: ``...what is the volume leak rate loss in a <span class="hlt">drill</span> rod string under varying condiditons of the joint boxes and pins being either dry or coated with lubricant...``. A Variation of this was to either have an o-ring installed or absent on the <span class="hlt">drill</span> rod that was grooved on the pin. A series of tests were run with both the o-ring grooved Longyear <span class="hlt">drill</span> rod and the plain pin end rod manufactured by Diamond <span class="hlt">Drill</span>. Test results show that <span class="hlt">drill</span> rod leakage of both types is lowered dramatically when thread lubricant is applied to the threaded joints and the joints made up tight. The Diamond <span class="hlt">Drill</span> rod with no o-ring groove has virtually no leakage when used with thread lubricant and the joints are properly tightened.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/1982tucz.rept.....M"><span id="translatedtitle">Development of new and improvement of existing <span class="hlt">core</span> recovery methods</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Marx, C.; Kroemer, E. J.</p> <p>1982-06-01</p> <p>Prospecting of new oil and gas fields through sampling of soil by <span class="hlt">core</span> <span class="hlt">drilling</span> was investigated. Two <span class="hlt">core</span> recovery methods were designed; corresponding prototypes were built and tested. The <span class="hlt">drill</span> mandrel, the <span class="hlt">core</span> barrel closing system, solliciation of the barrel by hydraulic friction, and sollicitation of the driving axe during side <span class="hlt">drilling</span> were studied. The <span class="hlt">core</span> barrel system with built in hydrostatic <span class="hlt">drill</span> motor and diamond bit <span class="hlt">drill</span> was retained. This combination leads to a <span class="hlt">core</span> sample recovery rate of over 90% and a <span class="hlt">drill</span> speed increase of 40% over the rotary <span class="hlt">core</span> sampling system. The KIBM-1 prototype was tested in five <span class="hlt">drilling</span> applications in deep wells. The sidewall <span class="hlt">coring</span> system permits recovery of <span class="hlt">core</span> material from the bore hole wall for boreholes at least eight and a half inches in diameter.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://oaktrust.library.tamu.edu//handle/1969.1/ETD-TAMU-2009-05-782"><span id="translatedtitle">Managed Pressure <span class="hlt">Drilling</span> Candidate Selection </span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Nauduri, Anantha S.</p> <p>2010-07-14</p> <p>Managed Pressure <span class="hlt">Drilling</span> now at the pinnacle of the 'Oil Well <span class="hlt">Drilling</span>' evolution tree, has itself been coined in 2003. It is an umbrella term for a few new <span class="hlt">drilling</span> techniques and some preexisting <span class="hlt">drilling</span> techniques, ...</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=ERIC&redirectUrl=http://eric.ed.gov/?q=ocean+AND+crust&id=EJ155736"><span id="translatedtitle">Deep Sea <span class="hlt">Drilling</span> Project</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Kaneps, Ansis</p> <p>1977-01-01</p> <p>Discusses the goals of the ocean <span class="hlt">drilling</span> under the International Phase of Ocean <span class="hlt">Drilling</span>, which include sampling of the ocean crust at great depths and sampling of the sedimentary sequence of active and passive continental margins. (MLH)</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5659036"><span id="translatedtitle">Geoscience Research <span class="hlt">Drilling</span> Office Operations I: the North INYO <span class="hlt">Drilling</span> Program, 1984</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lysne, P.</p> <p>1986-05-01</p> <p>The North Inyo <span class="hlt">Drilling</span> Program was part of the Continental Scientific <span class="hlt">Drilling</span> Program/Thermal Regimes and it was put forth by the Department of Energy/Office of Basic Energy Sciences to explore roots of a 600 year old volcanic system which is found in the north-west corner of Long Valley Caldera, California. The responsibility of the Geoscience Research <span class="hlt">Drilling</span> Office was to provide logistical support to the scientific <span class="hlt">drilling</span> team. This support consisted of obtaining the necessary permits, obtaining a <span class="hlt">drilling</span> contract and providing field services involving logging and <span class="hlt">core</span> handling/laboratory facilities. The first portion of this program was successful when hole RDO-2b traversed the conduit which fed Obsidian Dome; the second portion succeeded when RDO-3a traversed the dike underlying the Inyo Chain of volcanoes.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/70012161"><span id="translatedtitle">Hydraulic piston <span class="hlt">coring</span> of late Neogene and Quaternary sections in the Caribbean and equatorial Pacific: Preliminary results of Deep Sea <span class="hlt">Drilling</span> Project leg 68.</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Prell, W.L.; Gardner, James V.; Adelseck, Charles; Blechschmidt, Gretchen; Fleet, Andrew J.; Keigwin, Lloyd D.; Kent, Dennis V.; Ledbetter, Michael T.; Mann, Ulrich; Mayer, Larry; Reidel, William R.; Sancetta, Constance; Spariosu, Dann J.; Zimmerman, Herman B.</p> <p>1980-01-01</p> <p>The sediment of Site 502 (W.Caribbean) is primarily foram-bearing nanno marl which accumulated at c.3 to 4 cm/thousand yr. The bottom of Site 502 (228.7 m) is about 8 m.y. old. The sediment of Site 503 (Equatorial Pacific) is primarily siliceous calcareous ooze which accumulated at about 2 to 3 cm/thousand yr. The bottom of Site 503 (235.0 m) is about 8 m.y. old. The sediment at both sites shows a distinct cyclicity of CaCO3 content. These relatively high accumulation rate, continuous, undisturbed HPC <span class="hlt">cores</span> will enable a wide variety of high-resolution biostratigraphic, paleoclimatic, and paleoceanographic studies.- from Authors</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/ofr20101077"><span id="translatedtitle">Geochemical and stable isotopic data on barren and mineralized <span class="hlt">drill</span> <span class="hlt">core</span> in the Devonian Popovich Formation, Screamer sector of the Betze-Post gold deposit, northern Carlin trend, Nevada</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Christiansen, William D.; Hofstra, Albert H.; Zohar, Pamela B.; Tousignant, Gilles</p> <p>2011-01-01</p> <p>The Devonian Popovich Formation is the major host for Carlin-type gold deposits in the northern Carlin trend of Nevada. The Popovich is composed of gray to black, thin-bedded, calcareous to dolomitic mudstone and limestone deposited near the carbonate platform margin. Carlin-type gold deposits are Eocene, disseminated, auriferous pyrite deposits characterized by acid leaching, sulfidation, and silicification that are typically hosted in Paleozoic calcareous sedimentary rocks exposed in windows through siliceous sedimentary rocks of the Roberts Mountains allochthon. The Carlin trend currently is the largest gold producer in the United States. The Screamer ore zone is a tabular body on the periphery of the huge Betze-Post gold deposit. Screamer is a good place to study both the original lithogeochemistry of the Popovich Formation and the effects of subsequent alteration and mineralization because it is below the level of supergene oxidation, mostly outside the contact metamorphic aureole of the Jurassic Goldstrike stock, has small, high-grade ore zones along fractures and Jurassic dikes, and has intervening areas with lower grade mineralization and barren rock. In 1997, prior to mining at Screamer, <span class="hlt">drill</span> <span class="hlt">core</span> intervals from barren and mineralized Popovich Formation were selected for geochemical and stable isotope analysis. The 332, five-foot <span class="hlt">core</span> samples analyzed are from five holes separated by as much as 2000 feet (600 meters). The samples extend from the base of the Wispy unit up through the Planar and Soft sediment deformation units into the lower part of the upper Mud unit of the Popovich Formation.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/60436969"><span id="translatedtitle">Deepwater <span class="hlt">drilling</span> advancements</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Mott</p> <p>1980-01-01</p> <p>Problems encountered and solved during the <span class="hlt">drilling</span> of the record deepwater well, Blue H-28 (4876 ft), <span class="hlt">drilled</span> off the coast of Gander, Newfoundland are reiterated. The fact that deepwater production of petroleum and natural gas has not kept pace with the technology for <span class="hlt">drilling</span> deepwater wells is pointed out. New developments in technology for production from deepwater wells are discussed</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2014AGUFMOS53D1073E"><span id="translatedtitle">New Era of Scientific Ocean <span class="hlt">Drilling</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Eguchi, N.; Toczko, S.; Sanada, Y.; Igarashi, C.; Kubo, Y.; Maeda, L.; Sawada, I.; Takase, K.; Kyo, N.</p> <p>2014-12-01</p> <p>The D/V Chikyu, committed to scientific ocean <span class="hlt">drilling</span> since 2007, has completed thirteen IODP expeditions, and Chikyu's enhanced <span class="hlt">drilling</span> technology gives us the means to reach deep targets, enhanced well logging, deep water riserless <span class="hlt">drilling</span>, and state of the art laboratory. Chikyu recovered <span class="hlt">core</span> samples from 2466 meters below sea floor (mbsf) in IODP Exp. 337, and <span class="hlt">drilled</span> to 3058.5 mbsf in IODP Exp. 348, but these are still not the limit of Chikyu's capability. As deep as these depths are, they are just halfway to the 5200 mbsf plate boundary target for the NanTroSEIZE deep riser borehole. There are several active IODP proposals in the pipeline. Each has scientific targets requiring several thousand meters of penetration below the sea floor. Riser technology is the only way to collect samples and data from that depth. Well logging has been enhanced with the adoption of riser <span class="hlt">drilling</span>, especially for logging-while-<span class="hlt">drilling</span> (LWD). LWD has several advantages over wireline logging, and provides more opportunities for continuous measurements even in unstable boreholes. Because of the larger diameter of riser pipes and enhanced borehole stability, Chikyu can use several state-of-the-art downhole tools, e.g. fracture tester, fluid sampling tool, wider borehole imaging, and the latest sonic tools. These new technologies and tools can potentially expand the envelope of scientific ocean <span class="hlt">drilling</span>. Chikyu gives us access to ultra-deep water riserless <span class="hlt">drilling</span>. IODP Exp. 343/343T investigating the March 2011 Tohoku Oki Earthquake, explored the toe of the landward slope of the Japan Trench. This expedition reached the plate boundary fault target at more than 800 mbsf in water depths over 6900 m for logging-while-<span class="hlt">drilling</span>, <span class="hlt">coring</span>, and observatory installation. This deep-water <span class="hlt">drilling</span> capability also expands the scientific ocean <span class="hlt">drilling</span> envelope and provides access to previously unreachable targets. On top of these operational capabilities, Chikyu's onboard laboratory is equipped with state-of-the-art instruments to analyze all science samples. X-ray CT creates non-destructive 3D images of <span class="hlt">core</span> samples providing high resolution structural detail. The microbiology laboratory offers clean and contamination-free work environments required for microbiological samples.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/138760"><span id="translatedtitle">Assessment of <span class="hlt">geophysical</span> logs from borehole USW G-2, Yucca Mountain, Nevada</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Nelson, P.H. [Geological Survey, Denver, CO (United States); Schimschal, U. [Bureau of Reclamation, Denver, CO (United States)</p> <p>1993-05-01</p> <p>Commercial logging contractors, Western Atlas, Schlumberger, and Edcon obtained borehole <span class="hlt">geophysical</span> logs at the site of a potential high level nuclear waste repository at Yucca Mountain, Nevada. <span class="hlt">Drill</span> hole USW-G2 was picked for this test of suitable logging tools and logging technology, both representing state-of-the-art technology by these commercial companies. Experience gained by analysis of existing <span class="hlt">core</span> data and a variety of logs obtained earlier by Birdwell and Dresser Atlas served as a guide to a choice of logs to be obtained. Logs were obtained in water-filled borehole in zeolitized tuff (saturated zone) and in air-filled borehole largely in unaltered welded tuff (unsaturated zone).</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2012AGUFMOS31G..04F"><span id="translatedtitle">Geological & <span class="hlt">Geophysical</span> findings from seismic, well log and <span class="hlt">core</span> data for marine gas hydrate deposits at the 1st offshore methane hydrate production test site in the eastern Nankai Trough, offshore Japan: An overview</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Fujii, T.; Noguchi, S.; Takayama, T.; Suzuki, K.; Yamamoto, K.</p> <p>2012-12-01</p> <p>In order to evaluate productivity of gas from marine gas hydrate by the depressurization method, Japan Oil, Gas and Metals National Corporation is planning to conduct a full-scale production test in early 2013 at the AT1 site in the north slope of Daini-Atsumi Knoll in the eastern Nankai Trough, Japan. The test location was determined using the combination of detailed 3D seismic reflection pattern analysis, high-density velocity analysis, and P-impedance inversion analysis, which were calibrated using well log data obtained in 2004. At the AT1 site, one production well (AT1-P) and two monitoring wells (AT1-MC and MT1) were <span class="hlt">drilled</span> from February to March 2012, followed by 1 <span class="hlt">coring</span> well (AT1-C) from June to July 2012. An extensive logging program with logging while <span class="hlt">drilling</span> (LWD) and wireline-logging tools, such as GeoVISION (resistivity image), EcoScope (neutron/density porosity, mineral spectroscopy etc.), SonicScanner (Advanced Sonic tool), CMR/ProVISION (Nuclear Magnetic Resonance Tools), XPT (formation pressure, fluid mobility), and IsolationScanner (ultrasonic cement evaluation tools) was conducted at AT1-MC well to evaluate physical reservoir properties of gas hydrate-bearing sediments, to determine production test interval in 2013, and to evaluate cement bonding. Methane hydrate concentrated zone (MHCZ) confirmed by the well logging at AT1-MC was thin turbidites (tens of centimeters to few meters) with 60 m of gross thickness, which is composed of lobe type sequences in the upper part of it and channel sand sequences in the lower part. The gross thickness of MHCZ in the well is thicker than previous wells in 2004 (A1, 45 m) located around 150 m northeast, indicating that the prediction given by seismic inversion analysis was reasonable. Well-to-well correlation between AT1-MC and MT1 wells within 40 m distance exhibited that lateral continuity of these sand layers (upper part of reservoir) are fairly good, which representing ideal reservoir for the production test. The XPT measurement results showed approximately 0.1 to several mD of water permeability in both the hydrate-bearing formation and seal formation, although there are some variations in measured values. However, the comparison of these results with permeability estimated by NMR log showed significant discrepancy (more than one order of difference), which suggests that it is necessary to have further investigation considering the difference in scale, measurement direction (Kh or Kv), and calibration methodology by pressure <span class="hlt">core</span> data. In order to obtain basic reservoir/seal properties for the well log calibration within and above production test interval, pressure <span class="hlt">coring</span> using Hybrid Pressure <span class="hlt">Coring</span> System (Hybrid PCS) and also non-destructive <span class="hlt">core</span> analysis onboard using Pressure <span class="hlt">Core</span> Analysis and Transfer System (PCATS) were conducted for 60 m interval in AT1-C, which located about 10 m northeast of AT1-MC. Finally, integrated reservoir characterization based on well-log and pressure <span class="hlt">core</span> data was conducted to predict and optimize the flow rate of upcoming production test.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/60214432"><span id="translatedtitle">Effect of <span class="hlt">drilling</span> fluids on permeability of uranium sandstone</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>J. K. Ahlness; D. I. Johnson; D. R. Tweeton</p> <p>1984-01-01</p> <p>The Bureau of Mines conducted laboratory and field experiments to determine the amount of permeability reduction in uranium sandstone after its exposure to different <span class="hlt">drilling</span> fluids. Seven polymer and two bentonite fluids were laboratory-tested in their clean condition, and six polymer fluids were tested with simulated <span class="hlt">drill</span> cuttings added. Sandstone <span class="hlt">cores</span> cut from samples collected at an open pit uranium</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://www.agu.org/journals/jb/v101/iB05/95JB03346/95JB03346.pdf"><span id="translatedtitle">Osmium isotope systematics of <span class="hlt">drilled</span> lavas from Mauna Loa, Hawaii</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Erik H. Hauri; John C. Lassiter; Donald J. DePaolo</p> <p>1996-01-01</p> <p>We have investigated the isotopic compositions of Os, Sr, Nd, and Pb in a suite of primitive Mauna Loa lavas from the upper 280 m of the Hawaii Scientific <span class="hlt">Drilling</span> Project pilot <span class="hlt">core</span> <span class="hlt">drilled</span> near Hilo, Hawaii. These lavas were probably erupted from Mauna Loa's northeast rift. Correlations between Os (hosted by olivine) and other isotopes indicate that olivine crystals</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/49813535"><span id="translatedtitle">Future program of ocean research <span class="hlt">drilling</span> use of GLOMAR EXPLORER</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>F. MacTernan</p> <p>1977-01-01</p> <p>The scientists involved in earth science research and study have defined the task to explore the deep ocean margins and basins in 12000 to 14000 feet of water by <span class="hlt">drilling</span> into the earth to obtain <span class="hlt">cores</span> beneath the oceans to approximately 20000 feet. This task will require a large <span class="hlt">drill</span> ship, a 12000-14000 foot riser and well control system and</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6093909"><span id="translatedtitle"><span class="hlt">Drilling</span> innovations continue despite lean times</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Muhleman, T.; Dempsey, P.</p> <p>1984-10-01</p> <p>Although reduced activity has left its mark on engineering budgets and many projects have been delayed, industry remains committed to research and development. This year's emphasis is offshore where new-generation semi-submersibles are under construction for Arctic waters and where equipment technology is reaching maturity. Improved tubulars such as new process-forged <span class="hlt">drill</span> pipe, special alloy, corrosion-resistant pipe and new tool joint designs are finding eager markets both on and offshore. And back in the office, microcomputers, a curiosity a few years ago, are making significant advances in improving <span class="hlt">drilling</span> and production operations. Specific examples of this new technology include: Two high-tech, high-risk floaters Hard rock sidewall <span class="hlt">coring</span> tool New torque-resistant tool joint Two improved riser connection systems Breakthrough in <span class="hlt">drill</span> pipe manufacturing Power-packed portable <span class="hlt">drilling</span> computer.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2007AGUFM.T51C0676K"><span id="translatedtitle"><span class="hlt">Core</span> Across the San Andreas Fault at SAFOD - Photographs, Physical Properties Data, and <span class="hlt">Core</span>-Handling Procedures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kirschner, D. L.; Carpenter, B.; Keenan, T.; Sandusky, E.; Sone, H.; Ellsworth, B.; Hickman, S.; Weiland, C.; Zoback, M.</p> <p>2007-12-01</p> <p><span class="hlt">Core</span> samples were obtained that cross three faults of the San Andreas Fault Zone north of Parkfield, California, during the summer of 2007. The <span class="hlt">cored</span> intervals were obtained by sidetracking off the SAFOD Main Hole that was rotary <span class="hlt">drilled</span> across the San Andreas in 2005. The first <span class="hlt">cored</span> interval targeted the pronounced lithologic boundary between the Salinian terrane and the Great Valley and Franciscan formations. Eleven meters of pebbly conglomerate (with minor amounts of fine sands and shale) were obtained from 3141 to 3152 m (measured depth, MD). The two conglomerate units are heavily fractured with many fractures having accommodated displacement. Within this <span class="hlt">cored</span> interval, there is a ~1m zone with highly sheared, fine-grained material, possibly ultracataclasite in part. The second <span class="hlt">cored</span> interval crosses a creeping segment of a fault that has been deforming the cemented casing of the adjacent Main Hole. This <span class="hlt">cored</span> interval sampled the fault 100 m above a seismogenic patch of M2 repeating earthquakes. Thirteen meters of <span class="hlt">core</span> were obtained across this fault from 3186 to 3199 m (MD). This fault, which is hosted primarily in siltstones and shales, contains a serpentinite body embedded in a highly sheared shale and serpentinite-bearing fault gouge unit. The third <span class="hlt">cored</span> interval crosses a second creeping fault that has also been deforming the cemented casing of the Main Hole. This fault, which is the most rapidly shearing fault in the San Andreas fault zone based on casing deformation, contains multiple fine- grained clay-rich fault strands embedded in highly sheared shales and lesser deformed sandstones. Initial processing of the <span class="hlt">cores</span> was carried out at the <span class="hlt">drill</span> site. Each <span class="hlt">core</span> came to the surface in 9 meter-long aluminum <span class="hlt">core</span> barrels. These were cut into more manageable three-foot sections. The quarter-inch-thick aluminum liner of each section was cut and then split apart to reveal the 10 cm diameter <span class="hlt">cores</span>. Depending on the fragility and porosity of the rock, the <span class="hlt">drilling</span> fluid was removed either by washing with dilute calcium chloride brine (to approximately match the salinity of the formation fluids) or by gently scraping away <span class="hlt">drilling</span> mud on the <span class="hlt">core</span> surface. Once cleaned, each <span class="hlt">core</span> section was photographed to very high resolution on a Geotek Multi- Sensor <span class="hlt">Core</span> Logging (MSCL) system. This system was also used to determine the bulk density and magnetic susceptibility of each section. The 25 MB high-resolution photographs and the raw and processed physical properties data were then uploaded to the ICDP web server in Potsdam for public access (http://safod.icdp- online.org). The <span class="hlt">cores</span> will be archived at the Gulf Coast Repository of the Integrated Ocean <span class="hlt">Drilling</span> Program in College Station, TX. The MSCL photographs, physical property measurements, and other related data, such as <span class="hlt">geophysical</span> logs, will be integrated using <span class="hlt">Core</span>Wall, and will be on display at the meeting. All samples, data, and imagery are available to the science community.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/70018423"><span id="translatedtitle">The 40Ar/39Ar and K/Ar dating of lavas from the Hilo 1-km <span class="hlt">core</span> hole, Hawaii Scientific <span class="hlt">Drilling</span> Project</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Sharp, W.D.; Turrin, B.D.; Renne, P.R.; Lanphere, M.A.</p> <p>1996-01-01</p> <p>Mauna Kea lava flows <span class="hlt">cored</span> in the HilIo hole range in age from <200 ka to about 400 ka based on 40Ar/39Ar incremental heating and K-Ar analyses of 16 groundmass samples and one coexisting plagioclase. The lavas, all subaerially deposited, include a lower section consisting only of tholeiitic basalts and an upper section of interbedded alkalic, transitional tholeiitic, and tholeiitic basalts. The lower section has yielded predominantly complex, discordant 40Ar/39Ar age spectra that result from mobility of 40Ar and perhaps K, the presence of excess 40Ar, and redistribution of 39Ar by recoil. Comparison of K-Ar ages with 40Ar/39Ar integrated ages indicates that some of these samples have also lost 39Ar. Nevertheless, two plateau ages of 391 ?? 40 and 400 ?? 26 ka from deep in the hole, combined with data from the upper section, show that the tholeiitic section accumulated at an average rate of about 7 to 8 m/kyr and has an mean recurrence interval of 0.5 kyr/flow unit. Samples from the upper section yield relatively precise 40Ar/39Ar plateau and isotope correlation ages of 326 ?? 23, 241 ?? 5, 232 ?? 4, and 199 ?? 9 ka for depths of -415.7 m to -299.2 m. Within their uncertainty, these ages define a linear relationship with depth, with an average accumulation rate of 0.9 m/kyr and an average recurrence interval of 4.8 kyr/flow unit. The top of the Mauna Kea sequence at -280 m must be older than the plateau age of 132 ?? 32 ka, obtained for the basal Mauna Loa flow in the corehole. The upward decrease in lava accumulation rate is a consequence of the decreasing magma supply available to Mauna Kea as it rode the Pacific plate away from its magma source, the Hawaiian mantle plume. The age-depth relation in the <span class="hlt">core</span> hole may be used to test and refine models that relate the growth of Mauna Kea to the thermal and compositional structure of the mantle plume.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6401620"><span id="translatedtitle">Constraints on magma ascent, emplacement, and eruption: Geochemical and mineralogical data from the <span class="hlt">drill</span> <span class="hlt">core</span> at Inyo Craters, Inyo Chain, California: Final report</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Vogel, T.A.</p> <p>1988-01-01</p> <p>An 861-m-long hole (Inyo-4) has been <span class="hlt">cored</span> on a slanted trajectory that passed directly beneath South Inyo Crater in the west moat of Long Valley Caldera, California. The purpose of the hole was to investigate the magmatic behavior that led to surface deformation and phreatic activity during the 600-year-old eruption of the Inyo vent chain. The trajectory and stratigraphy encountered by Inyo-4 are shown. The volcanic and sedimentary sequence consists solely of post-Bishop Tuff caldera fill, including 319 m of moat basalt and 342 m of early rhyolite. Breccia zones that intrude the caldera fill were intersected at 12.0-9.3 m and 1.2-0.8 m SW and 8. 5-25.1 m NE of the crater center. The largest breccia unit is symmetrically zoned from margins rich in vesicular rhyolite and locally derived rhyolite wallrock to a center of up to 50 vol.% basalt. Most individual clasts of the rhyolite are less than or equal to0.1m; individual clasts in the basalt breccia are up to 1 m in intersected length. 6 figs., 3 tabs.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li class="active"><span>16</span></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_16 --> <div id="page_17" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li class="active"><span>17</span></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="321"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www.gm.univ-montp2.fr/spip/IMG/pdf/MantleFrontierWS_SciDrill_2011.pdf"><span id="translatedtitle">NUMBER1,2005 Published by the Integrated Ocean <span class="hlt">Drilling</span> Program with the International Continental Scientific <span class="hlt">Drilling</span> Program</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Demouchy, Sylvie</p> <p></p> <p>'s Mantle 51 <span class="hlt">Drilling</span> into 3.5-Billion-Years-Old Rocks 66 Reports on Deep Earth Sampling and Monitoring #12's Deepest Ice <span class="hlt">Core</span> 41 Climate and Tectonic Unrest: Dead Sea <span class="hlt">Drilling</span> 46 Workshop Reports: Sampling Earth. Climate changes will impact all humans. However, a large part of Earth's population lives in areas</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5443158"><span id="translatedtitle">Combination offshore <span class="hlt">drilling</span> rig</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lorenz, D.B.; Laid, J.S. II</p> <p>1986-07-29</p> <p>An offshore <span class="hlt">drilling</span> rig is described for use in <span class="hlt">drilling</span> into a formation below a body of water comprising a barge hull having a <span class="hlt">drilling</span> slot extending inwardly from the peripheral boundary of the barge hull, means for supporting the barge hull in a position above the water, a cantilever structure mounted on the barge hull and movable horizontally with respect to such barge hull, the cantilever structure being so located relative to the <span class="hlt">drilling</span> slot as to be movable horizontally into a position in vertical alignment with the <span class="hlt">drilling</span> slot, a derrick and <span class="hlt">drilling</span> machinery mounted to the cantilever structure and movable into a position above the <span class="hlt">drilling</span> slot whereby well <span class="hlt">drilling</span> operations may be conducted through the <span class="hlt">drilling</span> slot, the cantilever structure also being movable horizontally to a position which locates the derrick and the <span class="hlt">drilling</span> machinery outboard of the peripheral boundary of the barge hull, whereby a <span class="hlt">drilling</span> operations may be conducted outside of the peripheral boundary of the barge hull, means mounted on the barge hull for moving the cantilever structure horizontally to different positions relative to the barge hull.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2013Tectp.608...84T"><span id="translatedtitle">“Imaging” the cross section of oceanic lithosphere: The development and future of electrical microresistivity logging through scientific ocean <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tominaga, Masako</p> <p>2013-11-01</p> <p>A detailed understanding of the architecture of volcanic and magmatic lithologies present within the oceanic lithosphere is essential to advance our knowledge of the geodynamics of spreading ridges and subduction zones. Undertaking sub-meter scale observations of oceanic lithosphere is challenging, primarily because of the difficulty in direct continuous sampling (e.g., by scientific ocean <span class="hlt">drilling</span>) and the limited resolution of the majority of <span class="hlt">geophysical</span> remote sensing methods. Downhole logging data from drillholes through basement formations, when integrated with recovered <span class="hlt">core</span> and <span class="hlt">geophysical</span> remote sensing data, can provide new insights into crustal accretion processes, lithosphere hydrogeology and associated alteration processes, and variations in the physical properties of the oceanic lithosphere over time. Here, we introduce an alternative approach to determine the formation architecture and lithofacies of the oceanic sub-basement by using logging data, particularly utilizing downhole microresistivity imagery (e.g. Formation MicroScanner (FMS) imagery), which has the potential to become a key tool in deciphering the high-resolution internal architecture of the intact upper ocean crust. A novel ocean crust lithostratigraphy model based on meticulously deciphered lava morphology determined by in situ FMS electrofacies analysis of holes <span class="hlt">drilled</span> during Ocean <span class="hlt">Drilling</span> Program legs (1) advances our understanding of ocean crust formation and accretionary processes over both time and space; and (2) allows the linking of local igneous histories deciphered from the drillholes to the regional magmatic and tectonic histories. Furthermore, microresistivity imagery can potentially allow the investigation of (i) magmatic lithology and architecture in the lower ocean crust and upper mantle; and, (ii) void space abundances in crustal material and the determination of complex lithology-dependent void geometries.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/ofr9746"><span id="translatedtitle">Hydrogeologic facies characterization of an alluvial fan near Fresno, California, using <span class="hlt">geophysical</span> techniques</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Burow, Karen R.; Weissmann, G.S.; Miller, R.D.; Placzek, Gary</p> <p>1997-01-01</p> <p>DBCP (1,2-dibromo-3-chloropropane) contamination in the sole source aquifer near Fresno, California, has significantly affected drinking-water supplies. Borehole and surface <span class="hlt">geophysical</span> data were integrated with borehole textural data to characterize the Kings River alluvial fan sediments and to provide a framework for computer modeling of pesticide transport in ground water. Primary hydrogeologic facies units, such as gravel, coarse sand or gravel, fine sand, and silt and clay, were identified in <span class="hlt">cores</span> collected from three borings located on a 4.6-kilometer transect of multilevel monitoring wells. Borehole <span class="hlt">geophysical</span> logs collected from seven wells and surface <span class="hlt">geophysical</span> surveys were used to extrapolate hydrogeologic facies to depths of about 82meters and to correlate the facies units with neighboring <span class="hlt">drilling</span> sites. Thickness ranged from 0.3to 13 meters for sand and gravel units, and from 0.3 to 17 meters for silt and clay. The lateral extent of distinct silt and clay layers was mapped using shallow seismic reflection and ground-penetrating radar techniques. About 3.6 kilometers of seismic reflection data were collected; at least three distinct fine-grained layers were mapped. The depth of investigation of the seismic survey ranged from 34 to 107 meters below land surface, and vertical resolution was about 3.5 meters. The ground-penetrating radar survey covered 3.6kilometers and imaged a 1.5-meters thick, continuous fine-grained layer located at a depth of about 8 meters. Integrated results from the borehole sediment descriptions and <span class="hlt">geophysical</span> surveys provided a detailed characterization over a larger areal extent than traditional hydrogeologic methods alone.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www.engineering.dartmouth.edu/~d30345d/papers/1985-JGR-Elliptical%20Warm-Core%20Rings%20(wcorrection).pdf"><span id="translatedtitle">JOURNAL OF <span class="hlt">GEOPHYSICAL</span> RESEARCH, VOL. 90, NO. C6, PAGES 11,756-11,764, NOVEMBER 20, 1985 Oscillationsand Rotations of Elliptical Warm-<span class="hlt">Core</span> Rings</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Cushman-Roisin, Benoit</p> <p></p> <p>a strongthermoclinethat risesaround the warm-water pool and reachesthe surface,forming a front along the ring's periphery, theoreticaloceanographershave proposedvery few models of warm-corerings surroundedby an interfacethat extendsto the surface,forming Oscillationsand Rotations of Elliptical Warm-<span class="hlt">Core</span> Rings BENOIT CUSHMAN-ROISIN Mesoscale</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www.earthdynamics.org/torsvik/torsvik-papers/1994/1994_Torsvik_EOS.pdf"><span id="translatedtitle">Eos, Vol. 75, No. 40, October 4, 1994 At the same time, <span class="hlt">drilling</span> can contribute</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Torsvik, Trond Helge</p> <p></p> <p>Eos, Vol. 75, No. 40, October 4, 1994 At the same time, <span class="hlt">drilling</span> can contribute to a number questions at optimal geological sites from around the world and should involve <span class="hlt">drilling</span> and <span class="hlt">coring</span> at a variety of depths. That is, the program should not be restricted to only deep or shallow <span class="hlt">drilling</span></p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/54245780"><span id="translatedtitle">Workshop on Requirements for Robotic Underwater <span class="hlt">Drills</span> in U.S. Marine Geoscience Research</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>W. W. Sager; H. P. Johnson; H. Dick; P. Fryer</p> <p>2001-01-01</p> <p>At present, subsurface hard rock samples and sediment <span class="hlt">cores</span> deeper than ~30 m must be acquired using a <span class="hlt">drill</span> ship, but a <span class="hlt">drill</span> ship has severe limitations: high cost, limited availability, and poor performance in some lithologies. Many marine geoscience studies require more sampling than can be provided by the <span class="hlt">drill</span> ship, samples from those problem lithologies, or samples from</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5953845"><span id="translatedtitle">The physics of the earth's <span class="hlt">core</span>: An introduction</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Melchior, P.</p> <p>1986-01-01</p> <p>This book is a reference text providing information on physical topics of recent developments in internal <span class="hlt">geophysics</span>. The text summarizes papers covering theoretical <span class="hlt">geophysics</span>. Basic formulae, definitions and theorems are not explained in detail due to the limited space. The contents include applications to geodesy, <span class="hlt">geophysics</span>, astronomy, astrophysics, <span class="hlt">geophysics</span> and planetary physics. The formal contents include: The Earth's model; Thermodynamics; Hydrodynamics; Geomagnetism; <span class="hlt">Geophysical</span> implications in the Earth's <span class="hlt">core</span>.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.usgs.gov/of/1969/0087/plate-1.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1969/0087/plate-2.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1969/0087/plate-3.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1969/0087/plate-4.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1969/0087/plate-5.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1969/0087/plate-6.pdf@displayLabelpdf@notePLATE#texthttp://pubs.usgs.gov/of/1969/0087/plate-7.pdf"><span id="translatedtitle">Evaluation of <span class="hlt">core</span> data, physical properties, and oil yield USBM/AEC Colorado <span class="hlt">Core</span> Hole no. 3 (Bronco BR-1)</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Ege, John R.; Carroll, R.D.; Way, R.J.; Magner, J.E.</p> <p>1969-01-01</p> <p>USBM/AEC Colorado <span class="hlt">Core</span> Hole No. 3 (Bronco BR-1) is located in the SW1/4SW1/4SW1/4 sec. 14, T. 1 N., R. 98 W., Rio Blanco County, Colorado. The collar is at a ground elevation of 6,356 feet. The hole was <span class="hlt">core</span> <span class="hlt">drilled</span> between depths of 964 and 3,325 feet with a total depth of 3,797 feet. The hole was <span class="hlt">drilled</span> to investigate geologic, <span class="hlt">geophysical</span> and hydrological conditions at a possible in situ oil-shale retorting experiment site. The <span class="hlt">drill</span> hole passed through 1,157 feet of alluvium and the Evacuation Creek Member of the Green River Formation, 1,603 feet of the Parachute Creek Member and penetrated into the Garden Gulch Member of the Green River Formation. In-bole density log/oil yield ratio interpretation indicates that two oil-shale zones exist which yield more than 20 gallons of shale oil per ton of rock; an upper zone lying between 1,271 and 1,750 feet in depth and a lower zone lying between 1,900 and 2,964 feet. Halite (sodium chloride salt) is found between 2,140 and 2,185 feet and nahcolite (sodium bicarbonate salt) between 2,195 and 2,700 feet. Nahcolite was present at one time above 2,195 feet but has been subsequently dissolved out by ground water. The <span class="hlt">core</span> can be divided into six structural units based upon degree of fracturing. A highly fractured interval is found between 1,646 and 1,899 feet, which coincides with the dissolution or leached nahcolite zone. Physical property tests made on <span class="hlt">core</span> samples between 1,356 and 3,253 feet give average values of 11,988 psi for uniaxial compressive strength, 1.38 X 10[superscript]6[superscript] psi for static Young's modulus and 11,809 fps for compressional velocity.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=19800000066&hterms=oil+drill&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Doil%2Bdrill"><span id="translatedtitle"><span class="hlt">Drilling</span> side holes from a borehole</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Collins, E. R., Jr.</p> <p>1980-01-01</p> <p>Machine takes long horizontal stratum samples from confines of 21 cm bore hole. Stacked interlocking half cylindrical shells mate to form rigid thrust tube. Drive shaft and <span class="hlt">core</span> storage device is flexible and retractable. Entire machine fits in 10 meter length of steel tube. Machine could <span class="hlt">drill</span> drainage or ventilation holes in coal mines, or provide important information for geological, oil, and geothermal surveys.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/1148774"><span id="translatedtitle">Kimama Well - Borehole <span class="hlt">Geophysics</span> Database</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Shervais, John</p> <p>2011-07-04</p> <p>The Snake River Plain (SRP), Idaho, hosts potential geothermal resources due to elevated groundwater temperatures associated with the thermal anomaly Yellowstone-Snake River hotspot. Project HOTSPOT has coordinated international institutions and organizations to understand subsurface stratigraphy and assess geothermal potential. Over 5.9km of <span class="hlt">core</span> were <span class="hlt">drilled</span> from three boreholes within the SRP in an attempt to acquire continuous <span class="hlt">core</span> documenting the volcanic and sedimentary record of the hotspot: (1) Kimama, (2) Kimberly, and (3) Mountain Home. The Kimama <span class="hlt">drill</span> site was set up to acquire a continuous record of basaltic volcanism along the central volcanic axis and to test the extent of geothermal resources beneath the Snake River aquifer. Data submitted by project collaborator Doug Schmitt, University of Alberta</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/1148780"><span id="translatedtitle">Kimberly Well - Borehole <span class="hlt">Geophysics</span> Database</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Shervais, John</p> <p>2011-07-04</p> <p>The Snake River Plain (SRP), Idaho, hosts potential geothermal resources due to elevated groundwater temperatures associated with the thermal anomaly Yellowstone-Snake River hotspot. Project HOTSPOT has coordinated international institutions and organizations to understand subsurface stratigraphy and assess geothermal potential. Over 5.9km of <span class="hlt">core</span> were <span class="hlt">drilled</span> from three boreholes within the SRP in an attempt to acquire continuous <span class="hlt">core</span> documenting the volcanic and sedimentary record of the hotspot: (1) Kimama, (2) Kimberly, and (3) Mountain Home. The Kimberly <span class="hlt">drill</span> hole was selected to document continuous volcanism when analysed in conjunction with the Kimama and is located near the margin of the plain. Data submitted by project collaborator Doug Schmitt, University of Alberta</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/55205740"><span id="translatedtitle">The Search for Subsurface Life on Mars: Results from the MARTE Analog <span class="hlt">Drill</span> Experiment in Rio Tinto, Spain</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>C. R. Stoker; L. G. Lemke; H. Cannon; B. Glass; S. Dunagan; J. Zavaleta; D. Miller; J. Gomez-Elvira</p> <p>2006-01-01</p> <p>The Mars Analog Research and Technology (MARTE) experiment has developed an automated <span class="hlt">drilling</span> system on a simulated Mars lander platform including <span class="hlt">drilling</span>, sample handling, <span class="hlt">core</span> analysis and down-hole instruments relevant to searching for life in the Martian subsurface.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/70036051"><span id="translatedtitle">Constraints on the stress state of the San Andreas Fault with analysis based on <span class="hlt">core</span> and cuttings from San Andreas Fault Observatory at Depth (SAFOD) <span class="hlt">drilling</span> phases 1 and 2</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Tembe, S.; Lockner, D.; Wong, T.-F.</p> <p>2009-01-01</p> <p>Analysis of field data has led different investigators to conclude that the San Andreas Fault (SAF) has either anomalously low frictional sliding strength (?? 0.6). Arguments for the apparent weakness of the SAF generally hinge on conceptual models involving intrinsically weak gouge or elevated pore pressure within the fault zone. Some models assert that weak gouge and/or high pore pressure exist under static conditions while others consider strength loss or fluid pressure increase due to rapid coseismic fault slip. The present paper is composed of three parts. First, we develop generalized equations, based on and consistent with the Rice (1992) fault zone model to relate stress orientation and magnitude to depth-dependent coefficient of friction and pore pressure. Second, we present temperature-and pressure-dependent friction measurements from wet illite-rich fault gouge extracted from San Andreas Fault Observatory at Depth (SAFOD) phase 1 <span class="hlt">core</span> samples and from weak minerals associated with the San Andreas Fault. Third, we reevaluate the state of stress on the San Andreas Fault in light of new constraints imposed by SAFOD borehole data. Pure talc (?????0.1) had the lowest strength considered and was sufficiently weak to satisfy weak fault heat flow and stress orientation constraints with hydrostatic pore pressure. Other fault gouges showed a systematic increase in strength with increasing temperature and pressure. In this case, heat flow and stress orientation constraints would require elevated pore pressure and, in some cases, fault zone pore pressure in excess of vertical stress. Copyright 2009 by the American <span class="hlt">Geophysical</span> Union.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2001AGUSM...V62A05S"><span id="translatedtitle">Workshop on Requirements for Robotic Underwater <span class="hlt">Drills</span> in U.S. Marine Geoscience Research</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sager, W. W.; Johnson, H. P.; Dick, H.; Fryer, P.</p> <p>2001-05-01</p> <p>At present, subsurface hard rock samples and sediment <span class="hlt">cores</span> deeper than ~30 m must be acquired using a <span class="hlt">drill</span> ship, but a <span class="hlt">drill</span> ship has severe limitations: high cost, limited availability, and poor performance in some lithologies. Many marine geoscience studies require more sampling than can be provided by the <span class="hlt">drill</span> ship, samples from those problem lithologies, or samples from locations where the <span class="hlt">drill</span> ship cannot go. Robotic underwater <span class="hlt">drills</span> may help satisfy this need. Twenty-five scientists and engineers, representing a variety of academic institutions and scientific interests, met on November 3 and 4, 2000, to discuss how to bring about the ready access to robotic underwater <span class="hlt">drills</span> for scientists engaged in academic research. The workshop considered what science programs would benefit from robotic <span class="hlt">drills</span>, how many <span class="hlt">drills</span> of what specifications are needed, and how such <span class="hlt">drills</span> should be supported. The consensus was that there is a widespread need for a several <span class="hlt">drills</span>. Most scientists wish for a Robotic Ocean-Bottom <span class="hlt">drill</span> (ROBO-<span class="hlt">drill</span>) that can <span class="hlt">core</span> 50-100 m below the seafloor, with either rotary diamond bits or hydraulic corer, and retrieve <span class="hlt">cores</span> >5 cm diameter from water depths up to ~4500 m. Although this big ROBO-<span class="hlt">drill</span> has the widest application, attendees also favored three "niche" <span class="hlt">drills</span> with different configurations. On the smaller end, there is a need for mini-ROBO-<span class="hlt">drill</span> that is simple, can work in deeper water, is easily shipped and maintained, and would likely have a single <span class="hlt">core</span> barrel 1-2 m in length. This <span class="hlt">drill</span> would be for projects in which small penetration is adequate but cost is a primary concern. An ROV-based <span class="hlt">drill</span> is also needed, attached to a widely available platform. With high maneuverability and excellent imaging capability, the ROV-<span class="hlt">drill</span> would be the equivalent of a geologist roaming the seafloor with a rock hammer. There also may be a need for a slightly larger, single-barrel <span class="hlt">drill</span> that can <span class="hlt">core</span> up to ~5 m depth to reach below small sediment ponds and below weathered zones. This <span class="hlt">drill</span> would have the advantage of lower weight, size, and cost over the big ROBO-<span class="hlt">drill</span>. Workshop attendees also felt that the usual model for equipment development, a single investigator or small team, relying on funding from individual projects, is inadequate. A large, expensive ROBO-<span class="hlt">drill</span> requires a team of technicians and continuous maintenance. This is difficult to achieve on individual grants and probably means that a <span class="hlt">drill</span> facility is necessary.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://drillinglab.mred.tuc.gr/publications/60.pdf"><span id="translatedtitle">MONITORING <span class="hlt">DRILLING</span> BIT PARAMETERS ALLOWS OPTIMIZATION OF <span class="hlt">DRILLING</span> RATES</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>V. C. Kelessidis; P. Dalamarinis</p> <p></p> <p><span class="hlt">Drilling</span> for mineral resources can be one of the most expensive processes in the exploration and production. Hence, <span class="hlt">drilling</span> industry has been striving since its inception for developing <span class="hlt">drilling</span> techniques which allow for fast <span class="hlt">drilling</span> rates but ensuring the safety of the well and of the workers. Parameters affecting the <span class="hlt">drilling</span> process can be cast in two major categories, rig</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://iodp.tamu.edu/publications/citations/AGI_study_2007.pdf"><span id="translatedtitle">2007 OCEAN <span class="hlt">DRILLING</span> CITATION REPORT Covering Deep Sea <span class="hlt">Drilling</span> Project-</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>weekly from the GeoRef database. Users can also access the database via the USIO Web site (http2007 OCEAN <span class="hlt">DRILLING</span> CITATION REPORT Covering Deep Sea <span class="hlt">Drilling</span> Project- and Ocean <span class="hlt">Drilling</span> Program approximately 22,500 citation records related to the Deep Sea <span class="hlt">Drilling</span> Project (DSDP), Ocean <span class="hlt">Drilling</span> Program</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NSDL&redirectUrl=http://www.ngdc.noaa.gov/ngdc.html"><span id="translatedtitle">National <span class="hlt">Geophysical</span> Data Center</span></a></p> <p><a target="_blank" href="http://nsdl.org/nsdl_dds/services/ddsws1-1/service_explorer.jsp">NSDL National Science Digital Library</a></p> <p></p> <p></p> <p>To say that the National <span class="hlt">Geophysical</span> Data Center (NGDC) brings a wide range of scientific materials together in one location online would perhaps be a bit of an understatement. This site brings together over 300 digital and analog databases, which include those that deal with marine conditions, lake <span class="hlt">cores</span>, seismic reflection, and ecosystems. Visitors can feel free to browse around in this list of databases via the "Data and Information" tab located on the top of the site's homepage, or they can also perform a more detailed search as well. It is worth noting that there are six featured types of databases on the homepage, which include solar events, geomagnetic data, and natural hazards. Additionally, a good way to keep abreast of new materials on the site is by looking at their "News and Features" area, which profiles data sets of note.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/52018118"><span id="translatedtitle">Stable isotope records from Dronning Maud Land: Results from the EPICA ice <span class="hlt">core</span> and the pre-site survey <span class="hlt">cores</span></span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>H. Oerter; W. Graf; H. Meyer; F. Wilhelms</p> <p>2003-01-01</p> <p>The European Project for Ice <span class="hlt">Coring</span> in Antarctica (EPICA) focuses on the <span class="hlt">drilling</span> of two deep ice <span class="hlt">cores</span>, the first at Dome Concordia in the Indian\\/Pacific sector, and the second in Dronning Maud Land in the Atlantic sector of Antarctica. We focus on Dronning Maud Land and the isotope records from ice <span class="hlt">cores</span> <span class="hlt">drilled</span> there. The pre-site survey <span class="hlt">cores</span> sampled</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/53629048"><span id="translatedtitle">Ship Heave Effects on ODP <span class="hlt">Drilling</span> Dynamics: analysis of MWD data in the Nankai Trough</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>G. Myers; P. Gaillot; D. Goldberg</p> <p>2001-01-01</p> <p>Characterization of the dynamics of ship heave and its effect on downhole <span class="hlt">drilling</span> and <span class="hlt">coring</span> has been long sought after in the Ocean <span class="hlt">Drilling</span> Program. Operating in the Nankai trough region, the JOIDES Resolution acquired new data of downhole parameters using commercially-available Measurement-While-<span class="hlt">Drilling</span> (MWD) tools at two <span class="hlt">drilling</span> sites. Our objective during ODP Leg 196 was to record weight-on-bit, rate</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li class="active"><span>17</span></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_17 --> <div id="page_18" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li class="active"><span>18</span></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="341"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/60025318"><span id="translatedtitle">New <span class="hlt">drilling</span> rigs</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Tubb</p> <p>1981-01-01</p> <p>Friede and Goldman Ltd. of New Orleans, Louisiana has a successful <span class="hlt">drilling</span> rig, the L-780 jack-up series. The triangular-shaped <span class="hlt">drilling</span> vessel measures 180 x 176 ft. and is equipped with three 352 ft legs including spud cans. It is designed to work in up to 250 ft waters and <span class="hlt">drill</span> to 20,000 ft depths. The unit is scheduled to begin</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/136651"><span id="translatedtitle">Ocean <span class="hlt">Drilling</span> Program: Results from tenth year of <span class="hlt">drilling</span> operations</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Rabinowitz, P.D.; Francis, T.J.G.; Baldauf, J.G.; Coyne, J.C.; McPherson, R.G.; Merrill, R.B.; Olivas, R.E. [Texas A and M Univ., College Station, TX (United States)</p> <p>1995-12-01</p> <p>The Ocean <span class="hlt">Drilling</span> Program (ODP) has completed 61 internationally staffed expeditions and ten years of scientific ocean <span class="hlt">drilling</span> in search of answers relating to the tectonic evolution of passive and active continental margins, origin and evolution of oceanic crust, origin and evolution of marine sedimentary sequences, and paleoceanography. To address these problems, ODP has made numerous advances in technology for retrieval of continuous undisturbed <span class="hlt">cores</span> under hostile environmental conditions. ODP curates over 198 km of <span class="hlt">cored</span> material and associated scientific data bases and publishes results of the scientific expeditions in a continuous series of Proceedings volumes. During its tenth year, ODP continued its pioneering exploration in the Atlantic Ocean. This paper reviews the <span class="hlt">drilling</span> activities associated with the Atlantic Leg of the project. It focuses on volcanic rifted margins and magma emplacement; the chemical composition and evolution of the lower crust and mantle; depth transect reconstruction for a variety of temporal resolutions; research on the Amazon deep-sea fan and associated paleoclimatology; temporal and spatial scales of fluid flow, the role of faults in fluid transport, and the relationships between mechanical state and seismicity in the northern Barbados accretionary prism; and the history of volcanic activity in the Canary Hotspot, the detailed evolution of large volcanic oceanic islands, the growth of volcanic aprons and the filling of the distal Madeira Abyssal Plain. Finally, Leg 158 investigated fluid flow, alteration and mineralization and associated geochemical fluxes, microbiological processes and the subsurface mixture of an active hydrothermal system on a slow spreading, sediment-free mid-ocean ridge (TAG area -- Mid Atlantic Ridge).</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/563643"><span id="translatedtitle">Remote <span class="hlt">drill</span> bit loader</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Dokos, J.A.</p> <p>1997-12-30</p> <p>A <span class="hlt">drill</span> bit loader is described for loading a tapered shank of a <span class="hlt">drill</span> bit into a similarly tapered recess in the end of a <span class="hlt">drill</span> spindle. The spindle has a transverse slot at the inner end of the recess. The end of the tapered shank of the <span class="hlt">drill</span> bit has a transverse tang adapted to engage in the slot so that the <span class="hlt">drill</span> bit will be rotated by the spindle. The loader is in the form of a cylinder adapted to receive the <span class="hlt">drill</span> bit with the shank projecting out of the outer end of the cylinder. Retainer pins prevent rotation of the <span class="hlt">drill</span> bit in the cylinder. The spindle is lowered to extend the shank of the <span class="hlt">drill</span> bit into the recess in the spindle and the spindle is rotated to align the slot in the spindle with the tang on the shank. A spring unit in the cylinder is compressed by the <span class="hlt">drill</span> bit during its entry into the recess of the spindle and resiliently drives the tang into the slot in the spindle when the tang and slot are aligned. 5 figs.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/871290"><span id="translatedtitle">Remote <span class="hlt">drill</span> bit loader</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Dokos, James A. (Idaho Falls, ID)</p> <p>1997-01-01</p> <p>A <span class="hlt">drill</span> bit loader for loading a tapered shank of a <span class="hlt">drill</span> bit into a similarly tapered recess in the end of a <span class="hlt">drill</span> spindle. The spindle has a transverse slot at the inner end of the recess. The end of the tapered shank of the <span class="hlt">drill</span> bit has a transverse tang adapted to engage in the slot so that the <span class="hlt">drill</span> bit will be rotated by the spindle. The loader is in the form of a cylinder adapted to receive the <span class="hlt">drill</span> bit with the shank projecting out of the outer end of the cylinder. Retainer pins prevent rotation of the <span class="hlt">drill</span> bit in the cylinder. The spindle is lowered to extend the shank of the <span class="hlt">drill</span> bit into the recess in the spindle and the spindle is rotated to align the slot in the spindle with the tang on the shank. A spring unit in the cylinder is compressed by the <span class="hlt">drill</span> bit during its entry into the recess of the spindle and resiliently drives the tang into the slot in the spindle when the tang and slot are aligned.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/567275"><span id="translatedtitle">Horizontal <span class="hlt">drilling</span> developments</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Gust, D.</p> <p>1997-05-01</p> <p>The advantages of horizontal <span class="hlt">drilling</span> are discussed. Use of horizontal <span class="hlt">drilling</span> has climbed in the past half decade as technology and familiarity offset higher costs with higher production rates and greater recoveries from new and existing wells. In essence, all types of horizontal wells expose a larger section of the reservoir to the wellbore with a resulting increase in flow rates. (A horizontal well may also be <span class="hlt">drilled</span> to provide coning control or to intersect vertical fractures.) Thus, <span class="hlt">drilling</span> horizontally, both onshore and offshore, reduces the number of wells necessary to develop a field.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-DOEDE&redirectUrl=http://www.osti.gov/dataexplorer/biblio/1148779"><span id="translatedtitle">Mountain Home Well - Borehole <span class="hlt">Geophysics</span> Database</span></a></p> <p><a target="_blank" href="http://www.osti.gov/dataexplorer">DOE Data Explorer</a></p> <p>Shervais, John</p> <p></p> <p>The Snake River Plain (SRP), Idaho, hosts potential geothermal resources due to elevated groundwater temperatures associated with the thermal anomaly Yellowstone-Snake River hotspot. Project HOTSPOT has coordinated international institutions and organizations to understand subsurface stratigraphy and assess geothermal potential. Over 5.9km of <span class="hlt">core</span> were <span class="hlt">drilled</span> from three boreholes within the SRP in an attempt to acquire continuous <span class="hlt">core</span> documenting the volcanic and sedimentary record of the hotspot: (1) Kimama, (2) Kimberly, and (3) Mountain Home. The Mountain Home <span class="hlt">drill</span> hole is located along the western plain and documents older basalts overlain by sediment. Data submitted by project collaborator Doug Schmitt, University of Alberta</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/1148779"><span id="translatedtitle">Mountain Home Well - Borehole <span class="hlt">Geophysics</span> Database</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Shervais, John</p> <p>2012-11-11</p> <p>The Snake River Plain (SRP), Idaho, hosts potential geothermal resources due to elevated groundwater temperatures associated with the thermal anomaly Yellowstone-Snake River hotspot. Project HOTSPOT has coordinated international institutions and organizations to understand subsurface stratigraphy and assess geothermal potential. Over 5.9km of <span class="hlt">core</span> were <span class="hlt">drilled</span> from three boreholes within the SRP in an attempt to acquire continuous <span class="hlt">core</span> documenting the volcanic and sedimentary record of the hotspot: (1) Kimama, (2) Kimberly, and (3) Mountain Home. The Mountain Home <span class="hlt">drill</span> hole is located along the western plain and documents older basalts overlain by sediment. Data submitted by project collaborator Doug Schmitt, University of Alberta</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6322217"><span id="translatedtitle">In-situ stress measurements during <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Daneshy, A.A.; Chisholm, P.T.; Cox, R.; Magee, D.; Slusher, G.</p> <p>1984-09-01</p> <p>This paper describes results of six microfracturing experiments in a gas well in South Texas. The experiments were conducted in open-hole and during the <span class="hlt">drilling</span> operation. Microfracturing consisted of pumping very small volumes of <span class="hlt">drilling</span> mud (tens of gallons) at very low rates (3-30 gpm). Three of these microfractures extended below the bottom of the hole and were <span class="hlt">cored</span> out while obtaining oriented <span class="hlt">cores</span>. Created fracture orientation was obtained from the fractures observed in the oriented <span class="hlt">core</span>. Several instantaneous shut-in pressures were recorded in each zone. These showed variations of about 200-300 psi. This magnitude change is attributable to changes in the mechanical properties of each formation. Measured values of instantaneous shut-in pressure did not show any trend with lithology (shale or sandstone), mechanical properties, or tensile strength.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/26294098"><span id="translatedtitle">Study for increasing micro-<span class="hlt">drill</span> reliability by vibrating <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Yang Zhaojun; Li Wei; Chen Yanhong; Wang Lijiang</p> <p>1998-01-01</p> <p>A study for increasing micro-<span class="hlt">drill</span> reliability by vibrating <span class="hlt">drilling</span> is described. Under the experimental conditions of this study it is observed, from reliability testing and the fitting of a life-distribution function, that the lives of micro-<span class="hlt">drills</span> under ordinary <span class="hlt">drilling</span> follow the log-normal distribution and the lives of micro-<span class="hlt">drills</span> under vibrating <span class="hlt">drilling</span> follow the Weibull distribution. Calculations for reliability analysis show</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/968339"><span id="translatedtitle">Advanced Seismic While <span class="hlt">Drilling</span> System</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Robert Radtke; John Fontenot; David Glowka; Robert Stokes; Jeffery Sutherland; Ron Evans; Jim Musser</p> <p>2008-06-30</p> <p>A breakthrough has been discovered for controlling seismic sources to generate selectable low frequencies. Conventional seismic sources, including sparkers, rotary mechanical, hydraulic, air guns, and explosives, by their very nature produce high-frequencies. This is counter to the need for long signal transmission through rock. The patent pending SeismicPULSER{trademark} methodology has been developed for controlling otherwise high-frequency seismic sources to generate selectable low-frequency peak spectra applicable to many seismic applications. Specifically, we have demonstrated the application of a low-frequency sparker source which can be incorporated into a <span class="hlt">drill</span> bit for <span class="hlt">Drill</span> Bit Seismic While <span class="hlt">Drilling</span> (SWD). To create the methodology of a controllable low-frequency sparker seismic source, it was necessary to learn how to maximize sparker efficiencies to couple to, and transmit through, rock with the study of sparker designs and mechanisms for (a) coupling the sparker-generated gas bubble expansion and contraction to the rock, (b) the effects of fluid properties and dynamics, (c) linear and non-linear acoustics, and (d) imparted force directionality. After extensive seismic modeling, the design of high-efficiency sparkers, laboratory high frequency sparker testing, and field tests were performed at the University of Texas Devine seismic test site. The conclusion of the field test was that extremely high power levels would be required to have the range required for deep, 15,000+ ft, high-temperature, high-pressure (HTHP) wells. Thereafter, more modeling and laboratory testing led to the discovery of a method to control a sparker that could generate low frequencies required for deep wells. The low frequency sparker was successfully tested at the Department of Energy Rocky Mountain Oilfield Test Center (DOE RMOTC) field test site in Casper, Wyoming. An 8-in diameter by 26-ft long SeismicPULSER{trademark} <span class="hlt">drill</span> string tool was designed and manufactured by TII. An APS Turbine Alternator powered the SeismicPULSER{trademark} to produce two Hz frequency peak signals repeated every 20 seconds. Since the ION <span class="hlt">Geophysical</span>, Inc. (ION) seismic survey surface recording system was designed to detect a minimum downhole signal of three Hz, successful performance was confirmed with a 5.3 Hz recording with the pumps running. The two Hz signal generated by the sparker was modulated with the 3.3 Hz signal produced by the mud pumps to create an intense 5.3 Hz peak frequency signal. The low frequency sparker source is ultimately capable of generating selectable peak frequencies of 1 to 40 Hz with high-frequency spectra content to 10 kHz. The lower frequencies and, perhaps, low-frequency sweeps, are needed to achieve sufficient range and resolution for realtime imaging in deep (15,000 ft+), high-temperature (150 C) wells for (a) geosteering, (b) accurate seismic hole depth, (c) accurate pore pressure determinations ahead of the bit, (d) near wellbore diagnostics with a downhole receiver and wired <span class="hlt">drill</span> pipe, and (e) reservoir model verification. Furthermore, the pressure of the sparker bubble will disintegrate rock resulting in an increased overall rates of penetration. Other applications for the SeismicPULSER{trademark} technology are to deploy a low-frequency source for greater range on a wireline for Reverse Vertical Seismic Profiling (RVSP) and Cross-Well Tomography. Commercialization of the technology is being undertaken by first contacting stakeholders to define the value proposition for rig site services utilizing SeismicPULSER{trademark} technologies. Stakeholders include national oil companies, independent oil companies, independents, service companies, and commercial investors. Service companies will introduce a new <span class="hlt">Drill</span> Bit SWD service for deep HTHP wells. Collaboration will be encouraged between stakeholders in the form of joint industry projects to develop prototype tools and initial field trials. No barriers have been identified for developing, utilizing, and exploiting the low-frequency SeismicPULSER{trademark} source in a</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2012epsc.conf..292A"><span id="translatedtitle">Iberian Pyrite Belt Subsurface Life (IPBSL), a <span class="hlt">drilling</span> project in a geochemical Mars terrestrial analogue</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Amils, R.; Fernández-Remolar, D. C.; Parro, V.; Manfredi, J. A.; Timmis, K.; Oggerin, M.; Sánchez-Román, M.; López, F. J.; Fernández, J. P.; Omoregie, E.; Gómez-Ortiz, D.; Briones, C.; Gómez, F.; García, M.; Rodríguez, N.; Sanz, J. L.</p> <p>2012-09-01</p> <p>Iberian Pyrite Belt Subsurface Life (IPBSL) is a <span class="hlt">drilling</span> project specifically designed to characterize the subsurface ecosystems operating in the Iberian Pyrite Belt (IPB), in the area of Peña de Hierro, and responsible of the extreme acidic conditions existing in the Rio Tinto basin [1]. Rio Tinto is considered a good geochemical terrestrial analogue of Mars [2, 3]. A dedicated <span class="hlt">geophysical</span> characterization of the area selected two <span class="hlt">drilling</span> sites (4) due to the possible existence of water with high ionic content (low resistivity). Two wells have been <span class="hlt">drilled</span> in the selected area, BH11 and BH10, of depths of 340 and 620 meters respectively, with recovery of <span class="hlt">cores</span> and generation of samples in anaerobic and sterile conditions. Preliminary results showed an important alteration of mineral structures associated with the presence of water, with production of expected products from the bacterial oxidation of pyrite (sulfates and ferric iron). Ion chromatography of water soluble compounds from uncontaminated samples showed the existence of putative electron donors (ferrous iron, nitrite in addition of the metal sulfides), electron acceptors (sulfate, nitrate, ferric iron) as well as variable concentration of metabolic organic acids (mainly acetate, formate, propionate and oxalate), which are strong signals of the presence of active subsurface ecosystem associated to the high sulfidic mineral content of the IPB. The system is driven by oxidants that appear to be provided by the rock matrix, only groundwater is needed to launch microbial metabolism. The geological, geomicrobiological and molecular biology analysis which are under way, should allow the characterization of this ecosystem of paramount interest in the design of an astrobiological underground Mars exploration mission in the near future.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://repository.tamu.edu/handle/1969.1/ETD-TAMU-2009-05-782"><span id="translatedtitle">Managed Pressure <span class="hlt">Drilling</span> Candidate Selection</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Nauduri, Anantha S.</p> <p>2010-07-14</p> <p><span class="hlt">drilling</span> hydraulics calculations and simulations. Most of them are designed for conventional well hydraulics, while some can perform Underbalanced <span class="hlt">Drilling</span> calculations, and a select few can perform Managed Pressure <span class="hlt">Drilling</span> calculations. Most of the few...</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=19800000108&hterms=furniture&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dfurniture"><span id="translatedtitle"><span class="hlt">Drill</span>-motor holding fixture</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Chartier, E. N.; Culp, L. N.</p> <p>1980-01-01</p> <p>Guide improves accuracy and reduces likelihood of bit breakage in <span class="hlt">drilling</span> large work pieces. <span class="hlt">Drill</span> motor is mounted on pipe that slides on furniture clamp. <span class="hlt">Drill</span> is driven into work piece by turning furniture-clamp handle.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/55947060"><span id="translatedtitle"><span class="hlt">Core</span> <span class="hlt">Drilling</span> For ExtraTerrestrial Mining</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>D. S. Boucher; E. Dupuis</p> <p>2000-01-01</p> <p>Space Resource Utilization involves the active identification and mining of planetary bodies for commodities ranging from platinum group metals to water, such as might be realized from a dormant comet or carbonaceous chondrite like 1998 KY26, estimated to contain over 1 million gallons of water. Some proposed ET mining processes require access to sub-surface \\</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=20080004720&hterms=drilling+oil&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Ddrilling%2Boil"><span id="translatedtitle">Reverse laser <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Anthony, Thomas R. (Inventor)</p> <p>1984-01-01</p> <p>This invention provides a method for laser <span class="hlt">drilling</span> small diameter, closely-spaced, and accurately located holes in a body of material which is transparent or substantially transparent to the laser radiation employed whereby the holes are <span class="hlt">drilled</span> through the thickness of the body from the surface opposite to that on which the laser beam impinges to the surface of laser beam impingement.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/53816576"><span id="translatedtitle">Crustal observations through <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Barry Raliegh</p> <p>1984-01-01</p> <p>The use of the <span class="hlt">drill</span> to probe the earth's crust, driven by primarily economic incentives, has come a long way since the first oil well at Titusville, Penn., began producing torn a depth of 21 m in 1859. Wells have now been <span class="hlt">drilled</span> to depths of over 12 km (in the Kola Peninsula of the Soviet Union), in rocks where</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6159287"><span id="translatedtitle">Disposal of <span class="hlt">drilling</span> fluids</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Bryson, W.R.</p> <p>1983-06-01</p> <p>Prior to 1974 the disposal of <span class="hlt">drilling</span> fluids was not considered to be much of an environmental problem. In the past, disposal of <span class="hlt">drilling</span> fluids was accomplished in various ways such as spreading on oil field lease roads to stabilize the road surface and control dust, spreading in the base of depressions of sandy land areas to increase water retention, and leaving the fluid in the reserve pit to be covered on closure of the pit. In recent years, some states have become concerned over the indescriminate dumping of <span class="hlt">drilling</span> fluids into pits or unauthorized locations and have developed specific regulations to alleviate the perceived deterioration of environmental and groundwater quality from uncontrolled disposal practices. The disposal of <span class="hlt">drilling</span> fluids in Kansas is discussed along with a newer method or treatment in <span class="hlt">drilling</span> fluid disposal.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/226390"><span id="translatedtitle">Advanced <span class="hlt">drilling</span> systems</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Pierce, K.G.; Finger, J.T. [Sandia National Labs., Albuquerque, NM (United States); Livesay, B.J. [Livesay Consultants, San Diego, CA (United States)</p> <p>1995-12-31</p> <p><span class="hlt">Drilling</span> is ubiquitous in oil, gas, geothermal, minerals, water well, and mining industries. <span class="hlt">Drilling</span> and well completion account for 25% to 50% of the cost of producing power from geothermal energy. Reduced <span class="hlt">drilling</span> costs will reduce the cost of electricity produced from geothermal resources. Undoubtedly, there are concepts for advanced <span class="hlt">drilling</span> systems that have yet to be studied. However, the breadth and depth of previous efforts in this area almost guarantee that any new efforts will at least initially build on an idea or a variation of an idea that has already been investigated. Therefore, a review of previous efforts, coupled with a characterization of viable advanced <span class="hlt">drilling</span> systems and the current state of technology as it applies to those systems, provide the basis for this study.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/1176000"><span id="translatedtitle">Distributed downhole <span class="hlt">drilling</span> network</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Hall, David R.; Hall, Jr., H. Tracy; Fox, Joe; Pixton, David S.</p> <p>2006-11-21</p> <p>A high-speed downhole network providing real-time data from downhole components of a <span class="hlt">drilling</span> strings includes a bottom-hole node interfacing to a bottom-hole assembly located proximate the bottom end of a <span class="hlt">drill</span> string. A top-hole node is connected proximate the top end of the <span class="hlt">drill</span> string. One or several intermediate nodes are located along the <span class="hlt">drill</span> string between the bottom-hole node and the top-hole node. The intermediate nodes are configured to receive and transmit data packets transmitted between the bottom-hole node and the top-hole node. A communications link, integrated into the <span class="hlt">drill</span> string, is used to operably connect the bottom-hole node, the intermediate nodes, and the top-hole node. In selected embodiments, a personal or other computer may be connected to the top-hole node, to analyze data received from the intermediate and bottom-hole nodes.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5394892"><span id="translatedtitle">Coiled-tubing <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Leising, L.J.; Newman, K.R.</p> <p>1993-12-01</p> <p>For several years, CT has been used to <span class="hlt">drill</span> scale and cement in cased wells. Recently, CT has been used (in place of a rotary <span class="hlt">drilling</span> rig) to <span class="hlt">drill</span> vertical and horizontal open holes. At this time, < 30 openhole CT <span class="hlt">drilling</span> (CTD) jobs have been performed. However, there is a tremendous interest in this technique in the oil industry; many companies are actively involved in developing CTD technology. This paper discusses CTD applications and presents an engineering analysis of CTD. This analysis attempts to define the limits of what can and cannot be done with CTD. These limits are calculated with CT and <span class="hlt">drilling</span> models used for other applications. The basic limits associated with CTD are weight and size, CT force and life, and hydraulic limits. Each limit is discussed separately. For a specific application, each limit must be considered.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li class="active"><span>18</span></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_18 --> <div id="page_19" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li class="active"><span>19</span></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="361"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NSDL&redirectUrl=http://joidesresolution.org/node/273"><span id="translatedtitle">A Treasure Chest of <span class="hlt">Cores</span></span></a></p> <p><a target="_blank" href="http://nsdl.org/nsdl_dds/services/ddsws1-1/service_explorer.jsp">NSDL National Science Digital Library</a></p> <p></p> <p></p> <p>Over the years, the combined ocean <span class="hlt">drilling</span> programs (Deep Sea <span class="hlt">Drilling</span> Project, Ocean <span class="hlt">Drilling</span> Program, and Integrated Ocean <span class="hlt">Drilling</span> Program) have recovered thousands of <span class="hlt">cores</span> from beneath the ocean floor. Students can study a brief synopsis of some of the most important discoveries made from these <span class="hlt">cores</span> by clicking on an interactive map which shows sampling locations where major discoveries were made. Each link provides access to a photograph of a <span class="hlt">core</span> section which is accompanied by a description of the events or phenomena preserved in the sediment. Important discoveries preserved in these <span class="hlt">cores</span> include the asteroid impact at the Cretaceous-Tertiary boundary, mineral-bearing hydrothermal deposits from the Mid-Atlantic Ridge, evidence of plate tectonics, and evidence of climate change.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://www.episodes.org/backissues/211/60-63%20new%20publications.pdf"><span id="translatedtitle">Fundamentals of <span class="hlt">Geophysics</span></span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>William Lowrie; Ola M. Saether; A. A. Balkema; GEO ENV; Ian Lerche; M. C. R. Davies; M. Armstrong</p> <p>1997-01-01</p> <p>This unique textbook presents a comprehensive overview of the fundamental principles of <span class="hlt">geophysics</span>. Unlike most <span class="hlt">geophysics</span> textbooks, it combines both the applied and theoretical aspects to the subject. The author explains complex <span class="hlt">geophysical</span> concepts using abundant diagrams, a simplified mathematical treatment, and easy-to-follow equations. After placing the Earth in the context of the solar system, he describes each major branch</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/70027415"><span id="translatedtitle"><span class="hlt">Drill</span> hole logging with infrared spectroscopy</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Calvin, W.M.; Solum, J.G.</p> <p>2005-01-01</p> <p>Infrared spectroscopy has been used to identify rocks and minerals for over 40 years. The technique is sensitive to primary silicates as well as alteration products. Minerals can be uniquely identified based on multiple absorption features at wavelengths from the visible to the thermal infrared. We are currently establishing methods and protocols in order to use the technique for rapid assessment of downhole lithology on samples obtained during <span class="hlt">drilling</span> operations. Initial work performed includes spectral analysis of chip cuttings and <span class="hlt">core</span> sections from <span class="hlt">drill</span> sites around Desert Peak, NV. In this paper, we report on a survey of 10,000 feet of <span class="hlt">drill</span> cuttings, at 100 foot intervals, from the San Andreas Fault Observatory at Depth (SAFOD). Data from Blue Mountain geothermal wells will also be acquired. We will describe the utility of the technique for rapid assessment of lithologic and mineralogic discrimination.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/43181675"><span id="translatedtitle"><span class="hlt">Drilling</span> Systems for Extraterrestrial Subsurface Exploration</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>K. Zacny; Y. Bar-Cohen; M. Brennan; G. Briggs; G. Cooper; K. Davis; B. Dolgin; D. Glaser; B. Glass; S. Gorevan; J. Guerrero; C. McKay; G. Paulsen; C. Stoker</p> <p>2008-01-01</p> <p><span class="hlt">Drilling</span> consists of 2 processes: breaking the formation with a bit and removing the <span class="hlt">drilled</span> cuttings. In rotary <span class="hlt">drilling</span>, rotational speed and weight on bit are used to control <span class="hlt">drilling</span>, and the optimization of these parameters can markedly improve <span class="hlt">drilling</span> performance. Although fluids are used for cuttings removal in terrestrial <span class="hlt">drilling</span>, most planetary <span class="hlt">drilling</span> systems conduct dry <span class="hlt">drilling</span> with an</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/41048489"><span id="translatedtitle">The Lake Baikal <span class="hlt">drilling</span> project in the context of a global lake <span class="hlt">drilling</span> initiative</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Douglas F Williams; Mikhail I Kuzmin; Alexander A Prokopenko; Eugene B Karabanov; Galina K Khursevich; Elena V Bezrukova</p> <p>2001-01-01</p> <p>Records of the tectonic and climatic evolution of continental interiors are important for understanding the dynamics of the Earth's climate system, evolutionary processes within the terrestrial biosphere, and human origins. Sediment <span class="hlt">drill</span> <span class="hlt">cores</span> recovered from Lake Baikal provide essential records not only for comparison with oceanic records of marine processes, but also benchmarks which can be used to help interpret</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/60283125"><span id="translatedtitle">Mixer for <span class="hlt">drill</span> cuttings and <span class="hlt">drilling</span> mud on a <span class="hlt">drilling</span> location</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>J. G. J. van der Laan; W. Entrop</p> <p>1985-01-01</p> <p>A device for mixing of liquids and particulate solids, such as for instance a <span class="hlt">drilling</span> liquid and <span class="hlt">drill</span> cuttings on a <span class="hlt">drilling</span> location. This <span class="hlt">drilling</span> location can be a deep well <span class="hlt">drilled</span> for gas and\\/or oil by means of a <span class="hlt">drilling</span> tower on-or off-shore. The invention provides an elongated, rectangular open mixing tank on which a series of replacable agitating</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://hinmrec.hnei.hawaii.edu/wp-content/uploads/2013/09/5.3-Ted-Jagusztyn-Drilled-Hydrothermal-Energy.pdf"><span id="translatedtitle"><span class="hlt">DRILLED</span> HYDROTHERMAL ENERGY <span class="hlt">Drilling</span> for seawater</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>Water Desalination Fuel Production Waste Water Treatment Increased CO2 Absorbtion Agriculture & Mari) of cold water pipe WAS LOST 3 TIMES before demonstrating power generation #12;<span class="hlt">DRILLED</span> HYDROTHERMAL ENERGY BACKGROUND After a 2006 earthquake on the Big Island The NELHA cold water pipe cracked allowing warm water</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=20150007424&hterms=body+self&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dbody%2Bself"><span id="translatedtitle">Wireline Deep <span class="hlt">Drill</span> for the Exploration of Icy Bodies</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Paulsen, G.; Zacny, K.; Mellerowicz, B.; Craft, J.; Bar-Cohen, Y.; Beegle, L.; Sherrit, S.; Badescu, M.; Corsetti, F.; Ibarra, Y.</p> <p>2013-01-01</p> <p>One of the most pressing current questions in space science is whether life has ever arisen anywhere else in the universe. Water is a critical prerequisite for all life-as-we-know-it, thus the possible exploration targets for extraterrestrial life are bodies that have or had copious liquid: Mars, Europa, and Enceladus. Due to the oxidizing nature of Mars' surface, as well as subsurface liquid water reservoirs present on Europa and Enceladus, the search for evidence of existing life must likely focus on subsurface locations, at depths sufficient to support liquid water or retain biologic signatures. To address these questions, an Auto-Gopher sampler has been developed that is a wireline type <span class="hlt">drill</span>. This <span class="hlt">drill</span> is suspended on a tether and its motors and mechanisms are built into a tube that ends with a <span class="hlt">coring</span> bit. The tether provides the mechanical connection to a rover/lander on a surface as well as power and data communication. Upon penetrating to a target depth, the <span class="hlt">drill</span> is retracted from the borehole, the <span class="hlt">core</span> is deposited into a sample transfer system, and the <span class="hlt">drill</span> is lowered back into the hole. Wireline operation sidesteps one of the major drawbacks of traditional continuous <span class="hlt">drill</span> string systems by obviating the need for multiple <span class="hlt">drill</span> sections, which add significantly to the mass and the complexity of the system (i.e. penetration rate was 40 cm per hour). <span class="hlt">Drilling</span> to 2 meter depth and recovering of <span class="hlt">cores</span> every 10 cm took a total time of 15 hours (a single step of <span class="hlt">drilling</span> 10 cm and retrieving the <span class="hlt">core</span> was 45 minutes). Total energy to reach the 2 m depth was 500 Whr. The Weight on Bit was limited to less than 70 Newton. The <span class="hlt">core</span> recovery was 100%.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5763463"><span id="translatedtitle"><span class="hlt">Geophysical</span> modeling of the static water level</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Bochicchio, R.</p> <p>1991-04-01</p> <p>The objective of this study is to determine if a <span class="hlt">geophysical</span> investigation technique could be used to delineate depth to static water level to within 20 meters in several areas of the Nevada Test Site (NTS). Using noninvasive <span class="hlt">geophysical</span> methods to obtain water-level data is potentially faster and more cost-effective than <span class="hlt">drilling</span> wells, especially in the areas concerned, where water-level depths vary from approximately 200 to 600 meters. Electrical <span class="hlt">geophysical</span> methods are well-suited for water-level delineation. The depth to the static water level is often related to that of the saturated zone, and the saturated zone often has a different electrical resistivity character than the adjacent unsaturated material. Most of the time, this will be a resistivity decrease, due to the presence of water instead of air in the pore spaces. However, a saturated zone with a resistive matrix may show a resistivity increase compared to an unsaturated layer composed of more conductive material, such as clay. The analytical method is to use known depths and electrical resistivities of the static water level to obtain simulated <span class="hlt">geophysical</span> field data. These simulated data are referred to as the synthetic sounding curve. The synthetic sounding curve will be analyzed to see if it can be used to predict the static water level. 8 refs., 22 figs.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/10185682"><span id="translatedtitle">The rock melting approach to <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Cort, G.E.; Goff, S.J.; Rowley, J.C.; Neudecker, J.W. Jr.; Dreesen, D.S.; Winchester, W.</p> <p>1993-09-01</p> <p>During the early and mid-1970`s the Los Alamos National Laboratory demonstrated practical applications of <span class="hlt">drilling</span> and <span class="hlt">coring</span> using an electrically-heated graphite, tungsten, or molybdenum penetrator that melts a hole as it is slowly pushed through the rock or soil. The molten material consolidates into a rugged glass lining that prevents hole collapse; minimizes the potential for cross-flow, lost circulation, or the release of hazardous materials without casing operations; and produces no cuttings in porous or low density (<1.7 g/cc) formations. Because there are no <span class="hlt">drilling</span> fluids required, the rock melting approach reduces waste handling, treatment and disposal. <span class="hlt">Drilling</span> by rock melting has been demonstrated to depths up to 30 m in caliche, clay, alluvium, cobbles, sand, basalt, granite, and other materials. Penetrating large cobbles without debris removal was achieved by thermal stress fracturing and lateral extrusion of portions of the rock melt into the resulting cracks. Both horizontal and vertical holes in a variety of diameters were <span class="hlt">drilled</span> in these materials using modular, self-contained field units that operate in remote areas. Because the penetrator does not need to rotate, steering by several simple approaches is considered quite feasible. Melting is ideal for obtaining <span class="hlt">core</span> samples in alluvium and other poorly consolidated soils since the formed-in-place glass liner stabilizes the hole, encapsulates volatile or hazardous material, and recovers an undisturbed <span class="hlt">core</span>. Because of the relatively low thermal conductivity of rock and soil materials, the heat-affected zone beyond the melt layer is very small, <1 inch thick. Los Alamos has begun to update the technology and this paper will report on the current status of applications and designs for improved <span class="hlt">drills</span>.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-DOEDE&redirectUrl=http://www.osti.gov/dataexplorer/biblio/1148825"><span id="translatedtitle">Preliminary <span class="hlt">Drill</span> Sites</span></a></p> <p><a target="_blank" href="http://www.osti.gov/dataexplorer">DOE Data Explorer</a></p> <p>Lane, Michael</p> <p></p> <p>Preliminary locations for intermediate depth temperature gradient holes and/or resource confirmation wells based on compilation of geological, <span class="hlt">geophysical</span> and geochemical data prior to carrying out the DOE-funded reflection seismic survey.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2010AGUFM.B52B..07B"><span id="translatedtitle">Deep-Time <span class="hlt">drilling</span> in the Australian Archean: the Agouron Institute geobiological <span class="hlt">drilling</span> project. (Invited)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Buick, R.</p> <p>2010-12-01</p> <p>The Agouron Institute has sponsored deep-time <span class="hlt">drilling</span> across the South African Archean-Proterozoic boundary, investigating the rise of oxygen over an onshore-offshore environmental transect. It is now supporting a <span class="hlt">drilling</span> program in the Australian Archean of the Pilbara Craton, addressing a similar theme but with the added goal of resolving controversy over the age and origin of hydrocarbon biomarker molecules in ancient kerogenous shales. As these have been claimed to provide evidence for the evolution of oxygenic photosynthesis long before the rise of atmospheric oxygen to persistently high levels during the ~2.3 Ga “Great Oxidation Event”, their syngenesis with their host shales is thus of critical importance for the interpretation of Earth’s early oxygenation history. During the first <span class="hlt">drilling</span> season, 3 holes were <span class="hlt">drilled</span> using techniques and equipment to minimize organic geochemical contamination (new <span class="hlt">drill</span>-string components cleaned before <span class="hlt">drilling</span> potentially biomarker-bearing rocks, pre-contamination of <span class="hlt">drilling</span> fluid with a synthetic organic compound of similar geochemical characteristics to biomarkers, sterile cutting and storage of samples immediately upon retrieval from the <span class="hlt">core</span>-barrel). The initial hole was a blank control for organic geochemistry, <span class="hlt">drilled</span> into rocks too metamorphosed to retain biomarker molecules. These rocks, cherts, carbonates and pelites of the 3.52 Ga Coucal Formation, Coonterunah Group, have been metamorphosed to upper greenschist facies at temperatures near 500°C and so should have had any ancient soluble hydrocarbons destroyed. However, because they contain both carbonate and organic carbon, these rocks can instead provide isotopic information about the earliest evolution of biological metabolism as they possess residues of both the reactant and product sides of the carbon-fixation reaction. The second hole sampled an on-shore section of carbonates and kerogenous shales in the ~2.65 Ga Carawine Dolomite and Lewin Shale of the Hamersley Group near Yilgalong Creek. This location had been previously <span class="hlt">drilled</span> by a mining company in the 1980’s and the <span class="hlt">core</span> provided the highest biomarker yields of any Archean rocks thus far sampled. As it has been suggested that these biomarkers are non-indigenous contaminants, one possibility is that they were introduced into the <span class="hlt">drill-core</span> at some time between <span class="hlt">drilling</span> and sampling, so this hole tests that hypothesis. If biomarker concentrations and ratios differ significantly between the two adjacent holes with differing exposures to post-<span class="hlt">drilling</span> contaminants, then clearly contamination has affected one or other of the <span class="hlt">cores</span>. The third hole sampled an off-shore equivalent, through banded irons and kerogenous shales of the ~2.65 Ga Marra Mamba and Jeerinah Formations of the Hamersley Group near Cowcumba Creek. Another opportunity for contamination may arise during post-depositional but pre-<span class="hlt">drilling</span> hydrocarbon migration, when biomarkers can potentially be introduced into previously barren rocks by younger oils, so this hole tests that possibility. As it was <span class="hlt">drilled</span> through the same stratigraphic interval and structural domain as the second hole but in a different environment, biomarker ratios should be similar if contaminated but different if indigenous.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6437016"><span id="translatedtitle">Rotary <span class="hlt">drill</span> bit</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zijisling, D.H.</p> <p>1988-12-20</p> <p>This patent describes a rotary <span class="hlt">drill</span> bit for deephole <span class="hlt">drilling</span> in subsurface earth formations, the bit suitable to be coupled to the lower end of a <span class="hlt">drill</span> string, the bit body having a center region near a central axis of rotation and an outer region further removed from the central axis; and a plurality of cutting elements protruding from the bit body. The cutting elements comprising a front layer of interbonded abrasive particles, wherein the cutting elements located in the center region of the bit comprise a thicker abrasive front layer than those in the outer region of the bit.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/10178173"><span id="translatedtitle">Alphine 1/Federal: <span class="hlt">Drilling</span> report. Final report, Part 1</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Witcher, J.C. [New Mexico State Univ., Las Cruces, NM (United States). Southwest Technology Development Inst.; Pisto, L. [Tonto Drilling Services, Inc., Salt Lake City, UT (United States); Hahman, W.R. [Hahman (W. Richard), Las Cruces, NM (United States); Swanberg, C.A. [Swanberg (Chandler A.), Phoenix, AZ (United States)</p> <p>1994-06-01</p> <p>Regional geologic and <span class="hlt">geophysical</span> surveys, shallow temperature-gradient <span class="hlt">drilling</span>, and published reconnaissance geothermal studies infer possible hot dry rock (HDR) geothermal resources in the Alpine-Springerville area. This report discusses the results of a State of Arizona and US Department of Energy funded <span class="hlt">drilling</span> project designed to gather the deep temperature and stratigraphic data necessary to determine if near-term HDR geothermal potential actually exists in this portion of the White Mountains region of Arizona. A 4505 feet deep slim-hole exploratory well, Alpiner/Federal, was <span class="hlt">drilled</span> within the Apache-Sitgreaves National Forest at Alpine Divide near the Alpine Divide Camp Ground about 5 miles north of Alpine, Arizona in Apache County (Figure 1).</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2011AGUFM.P42B..04B"><span id="translatedtitle"><span class="hlt">Geophysical</span> Monitoring Station (GEMS)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Banerdt, B.; Dehant, V. M.; Lognonne, P.; Smrekar, S. E.; Spohn, T.; GEMS Mission Team</p> <p>2011-12-01</p> <p>GEMS (<span class="hlt">GEophysical</span> Monitoring Station) is one of three missions undergoing Phase A development for possible selection by NASA's Discovery Program. If selected, GEMS will perform the first comprehensive surface-based <span class="hlt">geophysical</span> investigation of Mars, filling a longstanding gap in the scientific exploration of the solar system. It will illuminate the fundamental processes of terrestrial planet formation and evolution, providing unique and critical information about the initial accretion of the planet, the formation and differentiation of the <span class="hlt">core</span> and crust, and the subsequent evolution of the interior. The scientific goals of GEMS are to understand the formation and evolution of terrestrial planets through investigation of the interior structure and processes of Mars and to determine its present level of tectonic activity and impact flux. A straightforward set of scientific objectives address these goals: 1) Determine the size, composition and physical state of the <span class="hlt">core</span>; 2) Determine the thickness and structure of the crust; 3) Determine the composition and structure of the mantle; 4) Determine the thermal state of the interior; 5) Measure the rate and distribution of internal seismic activity; and 6) Measure the rate of impacts on the surface. To accomplish these objectives, GEMS carries a tightly-focused payload consisting of 3 investigations: 1) SEIS, a 6-component, very-broad-band seismometer, with careful thermal compensation/control and a sensitivity comparable to the best terrestrial instruments across a frequency range of 1 mHz to 50 Hz; 2) HP3 (Heat Flow and Physical Properties Package), an instrumented self-penetrating mole system that trails a string of temperature sensors to measure the thermal gradient and conductivity of the upper several meters, and thus the planetary heat flux; and 3) RISE (Rotation and Interior Structure Experiment), which would use the spacecraft X-band communication system to provide precision tracking for planetary dynamical studies. The two instruments are moved from the lander deck to the martian surface by an Instrument Deployment Arm, with an appropriate location identified using an Instrument Deployment Camera. In order to ensure low risk within the tight Discovery cost limits, GEMS reuses the successful Lockheed Martin Phoenix spacecraft design, with a cruise and EDL system that has demonstrated capability for safe landing on Mars with well-understood costs. To take full advantage of this approach, all science requirements (such as instrument mass and power, landing site, and downlinked data volume) strictly conform to existing, demonstrated capabilities of the spacecraft and mission system. It is widely believed that multiple landers making simultaneous measurements (a network) are required to address the objectives for understanding terrestrial planet interiors. Nonetheless, comprehensive measurements from a single <span class="hlt">geophysical</span> station are extremely valuable, because observations constraining the structure and processes of the deep interior of Mars are virtually nonexistent. GEMS would utilize sophisticated analysis techniques specific to single-station measurements to determine crustal thickness, mantle structure, <span class="hlt">core</span> state and size, and heat flow, providing our first real look deep beneath the surface of Mars.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www-odp.tamu.edu/publications/prosp/203_prs/203prosp.pdf"><span id="translatedtitle">December 2001 OCEAN <span class="hlt">DRILLING</span> PROGRAM</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>December 2001 OCEAN <span class="hlt">DRILLING</span> PROGRAM LEG 203 SCIENTIFIC PROSPECTUS <span class="hlt">DRILLING</span> AT THE EQUATORIAL -------------------------------- Dr. Jack Bauldauf Deputy Director of Science Operations Ocean <span class="hlt">Drilling</span> Program Texas A&M University. Acton Leg Project Manager and Staff Scientist Ocean <span class="hlt">Drilling</span> Program Texas A&M University 1000 Discovery</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www-odp.tamu.edu/publications/prosp/210_prs/210prosp.pdf"><span id="translatedtitle">January 2003 OCEAN <span class="hlt">DRILLING</span> PROGRAM</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>January 2003 OCEAN <span class="hlt">DRILLING</span> PROGRAM LEG 210 SCIENTIFIC PROSPECTUS <span class="hlt">DRILLING</span> THE NEWFOUNDLAND HALF Baldauf Deputy Director of Science Operations Ocean <span class="hlt">Drilling</span> Program Texas A&M University 1000 Discovery Manager and Staff Scientist Ocean <span class="hlt">Drilling</span> Program Texas A&M University 1000 Discovery Drive College</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/60495769"><span id="translatedtitle">Well <span class="hlt">drilling</span> operation control procedure</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Bourdon</p> <p>1989-01-01</p> <p>This patent describes a test procedure carried out during well <span class="hlt">drilling</span> operations for monitoring rotary type well <span class="hlt">drilling</span> operations, by means of a <span class="hlt">drill</span> string fitted at its lower end with a bit and suspended by its upper end, at the surface, from a hook from the <span class="hlt">drill</span> rig. It comprises: applying a certain initial weight to the bit; keeping</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5301081"><span id="translatedtitle">In-situ stress measurements during <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Daneshy, A.A.; Slusher, G.L.; Chisholm, P.T.; Magee, D.A.</p> <p>1986-08-01</p> <p>This paper describes the results of six microfracturing experiments in a gas well in south Texas. The experiments were conducted in open hole and during the <span class="hlt">drilling</span> operations. Microfracturing consisted of pumping very small volumes of <span class="hlt">drilling</span> mud (tens of gallons) at very low rates (3 to 30 gal/min (189 to 1892 x 10 /sup -6/ M/sup 3//s)). Three of these microfractures extended below the bottom of the open hole and were <span class="hlt">cored</span> out. Created fracture orientation was obtained from the fractures observed in the oriented <span class="hlt">core</span>. Several instantaneous shut-in pressures recorded in each zone showed variations of about 200 to 300 psi (1.4 to 2.1 MPa). This magnitude change is attributable to heterogeneity of the rock. Measured values of instantaneous shut-in pressure (ISIP) did not show any trend with lithology (shale or sandstone), mechanical properties, or tensile strength.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2011AGUFM.H43E1272T"><span id="translatedtitle">Infiltration Experiment to Determine Vadose Zone Hydrologic Properties of a Stony Sediment Sequence Incorporating <span class="hlt">Geophysical</span> Methods</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Thoma, M. J.; Barrash, W.; Bradford, J. H.</p> <p>2011-12-01</p> <p>A 5-day infiltration/recovery experiment was conducted in August 2011 at the Boise Hydrogeophysical Research Site (BHRS) to quantify variably-saturated flow behavior and parameterize moisture-tension-hydraulic conductivity relationships in an unconsolidated stony sediment sequence using hydrologic and <span class="hlt">geophysical</span> methods. It is difficult to study hydrologic properties and behavior of such very coarse sediments in the lab primarily due to difficulty in obtaining coherent and representative samples, and difficulty in establishing effective hydrologic communication between instruments and samples. From <span class="hlt">geophysical</span> monitoring and <span class="hlt">coring</span> at the BHRS, we have identified a 5 m x 5 m x 2 m volume with consistent layered stratigraphy and have installed tensiometer nests and a neutron access tube to capture paired profile measurements of tension and moisture content in the vadose zone under natural conditions and during the test. Prior to the experiment, we used <span class="hlt">drilling</span> logs, <span class="hlt">core</span> samples, soil tension and moisture profiles, and ground-penetrating radar to determine 3D distribution and lithology of stratigraphic units. Grain-size distribution from <span class="hlt">core</span> data, laboratory infiltration experiments on <span class="hlt">core</span> sections, and inversion of tension and moisture response to natural rain events were used to estimate hydraulic properties, including van Genuchten parameters, porosity, and saturated hydraulic conductivity. Pre-test modeling with HYDRUS 1D was used to estimate "rain" application rate and duration required to reach steady-state and predict soil moisture / tension responses. Commercially available water misters were used to apply water over a 2 m by 5 m test area at a constant rate of ~1 cm/hr until steady-state, partially-saturated flow conditions were established through the entire 1.5 m vadose zone. After reaching steady-state, recovery was monitored for 3 days. Wetting front migration during infiltration and soil moisture redistribution after infiltration were observed continuously through vertically distributed tension and moisture measurements and with 3D ERT and 2D multi-offset GPR measurements. Temperature of the incoming water and soil temperature at the tensiometers was also measured. We present test results from both hydrologic and <span class="hlt">geophysical</span> data and results from modeling soil moisture and tension distribution during the entire test including parameterization of moisture - tension - hydraulic conductivity relationships associated with paired moisture - tension states of the different stratigraphic units in these stony sediments.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li class="active"><span>19</span></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_19 --> <div id="page_20" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li class="active"><span>20</span></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="381"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2009Tectp.466..307H"><span id="translatedtitle">Subsurface structure, physical properties, fault-zone characteristics and stress state in scientific <span class="hlt">drill</span> holes of Taiwan Chelungpu Fault <span class="hlt">Drilling</span> Project</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hung, Jih-Hao; Ma, Kuo-Fong; Wang, Chien-Yin; Ito, Hisao; Lin, Weiren; Yeh, En-Chao</p> <p>2009-03-01</p> <p>Continuous <span class="hlt">cores</span> and a suit of <span class="hlt">geophysical</span> measurements were collected in two scientific <span class="hlt">drill</span> holes to understand physical mechanisms involved in the large displacements during the 1999 Chi-Chi earthquake. Physical properties obtained from wire-line logs including P- and S-wave sonic velocity, gamma ray, electrical resistivity, density and temperature, are primarily dependent on parameters such as lithology, depth and fault zones. The average dip of bedding, identified from both <span class="hlt">cores</span> and FMI (or FMS) logs, is about 30° towards SE. Nevertheless, local azimuthal variations and increasing or decreasing bedding dips appear across fault zones. A prominent increase of structural dip to 60°-80° below 1856 m could be due to deformation associated with propagation of the Sanyi fault. A total of 12 fault zones identified in hole-A are located in the Plio-Pleistocene Cholan Formation, Pliocene Chinshui Shale and Miocene Kueichulin Formation. The shallowest fault zone occurs at 1111 m depth (FZ1111). It is a 1 m gouge zone including 12 cm of thick indurate black material. We interpreted this zone as the slip zone during Chi-Chi earthquake. FZ1111 is characterized by: 1) bedding-parallel thrust fault with 30-degree dip; 2) the lowest resistivity; 3) low density, Vp and Vs, 4) high Vp/ Vs ratio and Poisson's ratio; 5) low energy and velocity anisotropy, and low permeability within the homogeneous 1 m gouge zone; 6) increasing gas (CO 2 and CH 4) emissions, and 7) appearance of smectite within the primary slip zone. In situ stresses at the <span class="hlt">drill</span> site were inferred from leak-off tests, borehole breakouts and <span class="hlt">drilling</span>-induced tensile fractures from borehole FMS/FMI logs, and shear seismic wave anisotropy from DSI logs. The dominant fast shear-wave polarization direction is in good agreement with regional maximum horizontal stress axis, particularly within the strongly anisotropic Kueichulin Formation. A conjugate set of secondary directions are parallel to microcrack orientations. A drastic change of orientation of fast shear-wave polarization across the Sanyi thrust fault at the depth of 1712 m reflects the change of stratigraphy, physical properties and structural geometry.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/1176110"><span id="translatedtitle">While <span class="hlt">drilling</span> system and method</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Mayes, James C.; Araya, Mario A.; Thorp, Richard Edward</p> <p>2007-02-20</p> <p>A while <span class="hlt">drilling</span> system and method for determining downhole parameters is provided. The system includes a retrievable while <span class="hlt">drilling</span> tool positionable in a downhole <span class="hlt">drilling</span> tool, a sensor chassis and at least one sensor. The while <span class="hlt">drilling</span> tool is positionable in the downhole <span class="hlt">drilling</span> tool and has a first communication coupler at an end thereof. The sensor chassis is supported in the <span class="hlt">drilling</span> tool. The sensor chassis has a second communication coupler at an end thereof for operative connection with the first communication coupler. The sensor is positioned in the chassis and is adapted to measure internal and/or external parameters of the <span class="hlt">drilling</span> tool. The sensor is operatively connected to the while <span class="hlt">drilling</span> tool via the communication coupler for communication therebetween. The sensor may be positioned in the while <span class="hlt">drilling</span> tool and retrievable with the <span class="hlt">drilling</span> tool. Preferably, the system is operable in high temperature and high pressure conditions.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=ERIC&redirectUrl=http://eric.ed.gov/?q=paleoenvironments&id=EJ195282"><span id="translatedtitle">Deep-Sea <span class="hlt">Drilling</span>.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>White, Stan M.</p> <p>1979-01-01</p> <p><span class="hlt">Drilling</span> during 1978 focused on three major geologic problems: the nature and origin of the oceanic crust, the nature and geologic history of the active continental margins, and the oceanic paleoenvironment. (Author/BB)</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EIAPUBS&redirectUrl=http://www.eia.gov/petroleum/drilling/"><span id="translatedtitle"><span class="hlt">Drilling</span> Productivity Report</span></a></p> <p><a target="_blank" href="http://www.eia.doe.gov/reports/">EIA Publications</a></p> <p></p> <p>2015-01-01</p> <p>Energy Information Administration’s (EIA) new <span class="hlt">Drilling</span> Productivity Report (DPR) takes a fresh look at oil and natural gas production, starting with an assessment of how and where <span class="hlt">drilling</span> for hydrocarbons is taking place. The DPR uses recent data on the total number of <span class="hlt">drilling</span> rigs in operation along with estimates of <span class="hlt">drilling</span> productivity and estimated changes in production from existing oil and natural gas wells to provide estimated changes in oil and natural gas production for six key fields. EIA's approach does not distinguish between oil-directed rigs and gas-directed rigs because once a well is completed it may produce both oil and gas; more than half of the wells produce both.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/211325"><span id="translatedtitle"><span class="hlt">Drill</span> pipe protector development</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Thomerson, C.; Kenne, R. [Regal International Corp., Corsicanna, TX (United States); Wemple, R.P. [Sandia National Lab., Albuquerque, NM (United States)] [ed.] [and others</p> <p>1996-03-01</p> <p>The Geothermal <span class="hlt">Drilling</span> Organization (GDO), formed in the early 1980s by the geothermal industry and the U.S. Department of Energy (DOE) Geothermal Division, sponsors specific development projects to advance the technologies used in geothermal exploration, <span class="hlt">drilling</span>, and production phases. Individual GDO member companies can choose to participate in specific projects that are most beneficial to their industry segment. Sandia National Laboratories is the technical interface and contracting office for the DOE in these projects. Typical projects sponsored in the past have included a high temperature borehole televiewer, <span class="hlt">drill</span> bits, muds/polymers, rotary head seals, and this project for <span class="hlt">drill</span> pipe protectors. This report documents the development work of Regal International for high temperature geothermal pipe protectors.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/5810913"><span id="translatedtitle">Thermal spallation <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Williams, R.E.</p> <p>1985-01-01</p> <p>Thermal spallation <span class="hlt">drilling</span> is an underdeveloped process with great potential for reducing the costs of <span class="hlt">drilling</span> holes and mining shafts and tunnels in most very hard rocks. Industry has used this process to <span class="hlt">drill</span> blast holes for emplacing explosives and to quarry granite. Some theoretical work has been performed, and many signs point to a great future for this process. The Los Alamos National Laboratory has studied the theory of the spallation process and is conducting experiments to prove out the system and to adapt it for use with a conventional rotary rig. This report describes work that has been accomplished at the Laboratory on the development of thermal spallation <span class="hlt">drilling</span> and some work that is projected for the future on the system. 3 references, 3 figures.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/985416"><span id="translatedtitle">Subsurface <span class="hlt">drill</span> string</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Casper, William L. (Rigby, ID); Clark, Don T. (Idaho Falls, ID); Grover, Blair K. (Idaho Falls, ID); Mathewson, Rodney O. (Idaho Falls, ID); Seymour, Craig A. (Idaho Falls, ID)</p> <p>2008-10-07</p> <p>A <span class="hlt">drill</span> string comprises a first <span class="hlt">drill</span> string member having a male end; and a second <span class="hlt">drill</span> string member having a female end configured to be joined to the male end of the first <span class="hlt">drill</span> string member, the male end having a threaded portion including generally square threads, the male end having a non-threaded extension portion coaxial with the threaded portion, and the male end further having a bearing surface, the female end having a female threaded portion having corresponding female threads, the female end having a non-threaded extension portion coaxial with the female threaded portion, and the female end having a bearing surface. Installation methods, including methods of installing instrumented probes are also provided.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/1176077"><span id="translatedtitle"><span class="hlt">Drilling</span> fluid filter</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Hall, David R.; Fox, Joe; Garner, Kory</p> <p>2007-01-23</p> <p>A <span class="hlt">drilling</span> fluid filter for placement within a bore wall of a tubular <span class="hlt">drill</span> string component comprises a perforated receptacle with an open end and a closed end. A hanger for engagement with the bore wall is mounted at the open end of the perforated receptacle. A mandrel is adjacent and attached to the open end of the perforated receptacle. A linkage connects the mandrel to the hanger. The linkage may be selected from the group consisting of struts, articulated struts and cams. The mandrel operates on the hanger through the linkage to engage and disengage the <span class="hlt">drilling</span> fluid filter from the tubular <span class="hlt">drill</span> string component. The mandrel may have a stationary portion comprising a first attachment to the open end of the perforated receptacle and a telescoping adjustable portion comprising a second attachment to the linkage. The mandrel may also comprise a top-hole interface for top-hole equipment.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/1176086"><span id="translatedtitle">Logging-while-<span class="hlt">coring</span> method and apparatus</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Goldberg, David S.; Myers, Gregory J.</p> <p>2007-01-30</p> <p>A method and apparatus for downhole <span class="hlt">coring</span> while receiving logging-while-<span class="hlt">drilling</span> tool data. The apparatus includes <span class="hlt">core</span> collar and a retrievable <span class="hlt">core</span> barrel. The retrievable <span class="hlt">core</span> barrel receives <span class="hlt">core</span> from a borehole which is sent to the surface for analysis via wireline and latching tool The <span class="hlt">core</span> collar includes logging-while-<span class="hlt">drilling</span> tools for the simultaneous measurement of formation properties during the <span class="hlt">core</span> excavation process. Examples of logging-while-<span class="hlt">drilling</span> tools include nuclear sensors, resistivity sensors, gamma ray sensors, and bit resistivity sensors. The disclosed method allows for precise <span class="hlt">core</span>-log depth calibration and <span class="hlt">core</span> orientation within a single borehole, and without at pipe trip, providing both time saving and unique scientific advantages.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/919898"><span id="translatedtitle">Logging-while-<span class="hlt">coring</span> method and apparatus</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Goldberg, David S. (New York, NY); Myers, Gregory J. (Cornwall, NY)</p> <p>2007-11-13</p> <p>A method and apparatus for downhole <span class="hlt">coring</span> while receiving logging-while-<span class="hlt">drilling</span> tool data. The apparatus includes <span class="hlt">core</span> collar and a retrievable <span class="hlt">core</span> barrel. The retrievable <span class="hlt">core</span> barrel receives <span class="hlt">core</span> from a borehole which is sent to the surface for analysis via wireline and latching tool The <span class="hlt">core</span> collar includes logging-while-<span class="hlt">drilling</span> tools for the simultaneous measurement of formation properties during the <span class="hlt">core</span> excavation process. Examples of logging-while-<span class="hlt">drilling</span> tools include nuclear sensors, resistivity sensors, gamma ray sensors, and bit resistivity sensors. The disclosed method allows for precise <span class="hlt">core</span>-log depth calibration and <span class="hlt">core</span> orientation within a single borehole, and without at pipe trip, providing both time saving and unique scientific advantages.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://oaktrust.library.tamu.edu//handle/1969.1/4838"><span id="translatedtitle">Analysis and correlation of volcanic ash in marine sediments from the Peru Margin, Ocean <span class="hlt">Drilling</span> Program Leg 201: explosive volcanic cycles of the north-central Andes </span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Hart, Shirley Dawn</p> <p>2007-04-25</p> <p>A detailed investigation of <span class="hlt">cores</span> from three Peru Margin sites <span class="hlt">drilled</span> during Ocean <span class="hlt">Drilling</span> Program (ODP) Leg 201 has been conducted to determine the occurrence of volcanic ash layers and ash accumulations within marine sediments along the Peru...</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/544748"><span id="translatedtitle">Micro borehole <span class="hlt">drilling</span> platform</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>NONE</p> <p>1996-10-01</p> <p>This study by CTES, L.C. meets two main objectives. First, evaluate the feasibility of using coiled tubing (CT) to <span class="hlt">drill</span> 1.0 inches-2.5 inches diameter directional holes in hard rocks. Second, develop a conceptual design for a micro borehole <span class="hlt">drilling</span> platform (MBDP) meeting specific size, weight, and performance requirements. The Statement of Work (SOW) in Appendix A contains detailed specifications for the feasibility study and conceptual design.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/5114426"><span id="translatedtitle">Field project to obtain pressure <span class="hlt">core</span>, wireline log, and production test data for evaluation of CO/sub 2/ flooding potential. Conoco MCA unit well No. 358, Maljamar Field, Lea County, New Mexico. Final report</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Swift, T.E.; Kumar, R.M.; Marlow, R.E.; Wilhelm, M.H.</p> <p>1982-08-01</p> <p>Field operations, which were conducted as a cooperative effort between Conoco and Gruy Federal, began on January 16, 1980 when the well was spudded. The well was <span class="hlt">drilled</span> to 3692 feet, and 18 <span class="hlt">cores</span> recovered in 18 <span class="hlt">core</span>-barrel runs (144 feet). Upon completion of the <span class="hlt">coring</span> phase, the hole was <span class="hlt">drilled</span> to a total depth of 4150 feet and a complete suite of <span class="hlt">geophysical</span> logs was run. Logging was then followed by completion and testing by Concoco. <span class="hlt">Core</span> porosities agreed well with computed log porosities. <span class="hlt">Core</span> water saturation and computed log porosities agree fairly well from 3692 to 3712 feet, poorly from 3712 to 3820 feet and in a general way from 4035 to 4107 feet. Computer log analysis techniques did not improve the agreement of log versus <span class="hlt">core</span> derived water saturations. However, both <span class="hlt">core</span> and log analysis indicated the ninth zone had the highest residual hydrocarbon saturations. Residual oil saturation were 259 STB/acre-ft for the 4035 - 4055 feet interval, and 150 STB/acre-ft for the 3692 - 3718 feet interval. Nine BOPD was produced from the 4035 - 4055 feet interval and no oil was produced from 3692 to 3718 feet interval, qualitatively confirming the relative oil saturations. The low oil production in the zone from 4022 to 4055 and the lack of production from 3692 to 3718 feet indicated the zone to be at or near residual waterflood conditions as determined by log analysis. 68 figures, 11 tables.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2004AGUFM.V24B..01U"><span id="translatedtitle">Overview and the achievement of the Unzen Scientific <span class="hlt">Drilling</span> Project</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Uto, K.; Nakada, S.; Shimizu, H.; Sakuma, S.; Hoshizumi, H.</p> <p>2004-12-01</p> <p>Unzen volcano is an active volcano in SW Japan, and its 1990-95 eruption caused the frequent dome-collapse-type pyroclastic flows and associated debris flows. Detailed observations have enabled the constructions of magma ascent and eruption models. Unzen was born in 0.5 Ma and has grown inside the regional tectonic graben. Most of its eruption products have been thickly accumulated inside the active graben more than 1200 m beneath the current surface. Unzen Scientific <span class="hlt">Drilling</span> Project (USDP) is a six-year term international project started in April 1999, co-sponsored by the Japanese Government and International Continental Scientific <span class="hlt">Drilling</span> Program. The project includes not only scientific <span class="hlt">drillings</span> but also related geological, <span class="hlt">geophysical</span> and geochemical studies to totally understand the growth history, subsurface structure and magma ascending mechanism of Unzen Volcano. The highlight of USDP is to <span class="hlt">drill</span> into the still-hot magmatic conduit of 1990-95 eruption (conduit <span class="hlt">drilling</span>) to prove the magma ascent model based on detailed observations during the eruption, and is scheduled during the Phase II (2002-2005) of the project. Phase I of USDP (1999-2002) consists of <span class="hlt">drilling</span> two boreholes (USDP-1: 752 m and USDP-2: 1462 m) into the flanks of Unzen Volcano and conducting associated researches mainly to reveal the time-integrated process of Unzen volcano; i.e. three-dimensional structure and the growth history of the volcano. Pilot <span class="hlt">drilling</span> (USDP-3, 350m) associated with the scientific and <span class="hlt">drilling</span> strategy for the conduit <span class="hlt">drilling</span> was also conducted. Following the scientific results of Phase I, Phase II was approved by the funding agency and the conduit <span class="hlt">drilling</span> started in February 2003. Repeated troubles necessitated some modifications of the <span class="hlt">drilling</span> plan, but the <span class="hlt">drilling</span> was successfully ended in July 2004 by penetrating into the 1990-95 magmatic path about 1500m beneath the summit of Unzen volcano. Construction of an integrated evolutional and magmatic model of Unzen will be the final goal combining all scientific results in the end of the project.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/10116899"><span id="translatedtitle"><span class="hlt">Geophysical</span> surveys for proposed boreholes 299-W15-25, 26 and 27, 200 West Area</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Mitchell, T.H.</p> <p>1995-01-01</p> <p>The objective of the survey was to locate subsurface obstructions that may affect the <span class="hlt">drilling</span> of the proposed boreholes 299-W15-25, 299-w15-26, and 299-W15-27, north of the 321-Z building. The possible <span class="hlt">drill</span> sites within the zone with the least likelihood of encountering identified obstructions were identified based on the results of the survey. Ground-penetrating radar (GPR) was the <span class="hlt">geophysical</span> method chosen for the shallow characterization of this site.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://www.agu.org/journals/jb/v102/iB08/96JB03945/96JB03945.pdf"><span id="translatedtitle">The German Continental Deep <span class="hlt">Drilling</span> Program KTB: Overview and major results</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Rolf Emmermann; Jörn Lauterjung</p> <p>1997-01-01</p> <p>The German Continental Deep <span class="hlt">Drilling</span> Program (KTB) was designed to study the properties and processes of the deeper continental crust by means of a superdeep borehole. Major research themes were (1) the nature of <span class="hlt">geophysical</span> structures and phenomena, (2) the crustal stress field and the brittle-ductile transition, (3) the thermal structure of the crust, (4) crustal fluids and transport processes,</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www.climate.unibe.ch/~hfischer/Publications_files/weller04jgr.pdf"><span id="translatedtitle">Postdepositional losses of methane sulfonate, nitrate, and chloride at the European Project for Ice <span class="hlt">Coring</span> in Antarctica</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Fischer, Hubertus</p> <p></p> <p><span class="hlt">Coring</span> in Antarctica deep-<span class="hlt">drilling</span> site in Dronning Maud Land, Antarctica R. Weller,1 F. Traufetter,1,2 H) <span class="hlt">drilling</span> site in Dronning Maud Land (DML) (75°S, 0°E). Analyses of four intermediate deep firn <span class="hlt">cores</span> and 13, and chloride at the European Project for Ice <span class="hlt">Coring</span> in Antarctica deep-<span class="hlt">drilling</span> site in Dronning Maud Land</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/5454272"><span id="translatedtitle">Brief overview of <span class="hlt">geophysical</span> probing technology</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Ramirez, A.L.; Lytle, R.J.</p> <p>1982-02-01</p> <p>An evaluation of high-resolution <span class="hlt">geophysical</span> techniques which can be used to characterize a nulcear waste disposal site is being conducted by the Lawrence Livermore National Laboratory (LLNL) at the request of the US Nuclear Regulatory Commisson (NRC). LLNL is involved in research work aimed at evaluating the current capabilities and limitations of <span class="hlt">geophysical</span> methods used for site selection. This report provides a brief overview of the capabilities and limitations associated with this technology and explains how our work addresses some of the present limitations. We are examining both seismic and electromagnetic techniques to obtain high-resolution information. We are also assessing the usefulness of geotomography in mapping fracture zones remotely. Finally, we are collecting <span class="hlt">core</span> samples from a site in an effort to assess the capability of correlating such <span class="hlt">geophysical</span> data with parameters of interest such as fracture continuity, orientation, and fracture density.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/867746"><span id="translatedtitle">Fiber optic <span class="hlt">geophysical</span> sensors</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Homuth, Emil F. (Los Alamos, NM)</p> <p>1991-01-01</p> <p>A fiber optic <span class="hlt">geophysical</span> sensor in which laser light is passed through a sensor interferometer in contact with a <span class="hlt">geophysical</span> event, and a reference interferometer not in contact with the <span class="hlt">geophysical</span> event but in the same general environment as the sensor interferometer. In one embodiment, a single tunable laser provides the laser light. In another embodiment, separate tunable lasers are used for the sensor and reference interferometers. The invention can find such uses as monitoring for earthquakes, and the weighing of objects.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5813084"><span id="translatedtitle">New <span class="hlt">drilling</span> rigs</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Tubb, M.</p> <p>1981-02-01</p> <p>Friede and Goldman Ltd. of New Orleans, Louisiana has a successful <span class="hlt">drilling</span> rig, the L-780 jack-up series. The triangular-shaped <span class="hlt">drilling</span> vessel measures 180 x 176 ft. and is equipped with three 352 ft legs including spud cans. It is designed to work in up to 250 ft waters and <span class="hlt">drill</span> to 20,000 ft depths. The unit is scheduled to begin initial <span class="hlt">drilling</span> operations in the Gulf of Mexico for Arco. Design features are included for the unit. Davie Shipbuilding Ltd. has entered the Mexican offshore market with the signing of a $40,000,000 Canadian contract for a jack-up to work in 300 ft water depths. Baker Marine Corporation has contracted with the People's Republic of China for construction of two self-elevating jack-ups. The units will be built for Magnum Marine, headquartered in Houston. Details for the two rigs are given. Santa Fe International Corporation has ordered a new jack-up rig to work initially in the Gulf of Suez. The newly ordered unit, Rig 136, will be the company's fourth offshore <span class="hlt">drilling</span> rig now being built in the Far East. Temple <span class="hlt">Drilling</span> Company has signed a construction contract with Bethlehem Steel for a jack-up to work in 200 ft water depths. Penrod <span class="hlt">Drilling</span> Company has ordered two additional cantilever type jack-ups for Hitachi Shipbuilding and Engineering Co. Ltd. of Japan. Two semi-submersibles, capable of working in up to 2000 ft water depths, have been ordered by two Liberian companies. Details for these rigs are included. (DP)</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li class="active"><span>20</span></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_20 --> <div id="page_21" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li class="active"><span>21</span></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="401"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NSDL&redirectUrl=http://www.csus.edu/indiv/s/slaymaker/Archives/SQgeophysics.htm"><span id="translatedtitle">Study Questions for <span class="hlt">Geophysics</span></span></a></p> <p><a target="_blank" href="http://nsdl.org/nsdl_dds/services/ddsws1-1/service_explorer.jsp">NSDL National Science Digital Library</a></p> <p>Susan Slaymaker</p> <p></p> <p>This website hosts over fifty practice questions relating <span class="hlt">geophysics</span>. Topics covered in these questions include gravity, earthquake waves and seismicity, Earth's structure, geochronology, anomalies, viscosity, and polar wandering.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/53862185"><span id="translatedtitle">Active Heave-Compensated <span class="hlt">Coring</span> On The New Jersey Shelf</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>D. L. Nielson; M. Pardey; J. A. Austin; J. A. Goff; C. Alexander; B. A. Christensen; S. P. Gulick; C. S. Fulthorpe; S. Nordfjord; C. Sommerfield; C. Venherm</p> <p>2003-01-01</p> <p>The continental shelves are of obvious scientific and strategic importance. However, the ability to cost-effectively collect <span class="hlt">core</span> samples of continental shelf sediments has been limited by technical difficulties. Many sites of scientific interest are too shallow to be <span class="hlt">drilled</span> by large <span class="hlt">drill</span> ships, and they are too deep to be <span class="hlt">drilled</span> economically from jack-up platforms. DOSECC has developed an Active</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5990894"><span id="translatedtitle">The reservoir geology and <span class="hlt">geophysics</span> of the Hibernia field, offshore Newfoundland</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Hurley, T.J.; Kreisa, R.D.; Taylor, G.G.; Yates, W.R.L. (Mobil Oil Canada, Calgaary, Alberta (Canada))</p> <p>1990-09-01</p> <p>The Hibernia field is located 315 km (195 mi) east of St. John's, Newfoundland. The field was discovered in 1979. Pre-production investment, which includes the construction of a concrete gravity base structure (GBS), is currently estimated at approximately $5 billion Canadian. The plateau production rate is expected to average 17,480 m{sup 3}/day (110,000 b/day). To date, there is no hydrocarbon production from offshore eastern Canada. Hibernia field is located in the northwest sector of the rifted Jeanne d'Arc basin. The integrated geological and <span class="hlt">geophysical</span> interpretation of the field is based upon the results of 10 wells and 460 km{sup 2} (177 mi{sup 2}) of three-dimensional seismic data. The trap, as seismically defined, is an arcuate anticline created by rollover into the basin-bounding Murre fault. A complex system of faults divides the structure into numerous horsts and grabens. An estimated recoverable resource of 83 million m{sup 3} (525 million bbl) occurs in two Lower Cretaceous sandstone reservoirs. Berriasian- to Valanginian-age Hibernia sandstones are the primary reservoirs occurring at an average <span class="hlt">drill</span> depth of 3,720 m (12,200 ft). Average porosity is 16%; permeability ranges up to 2 d. Sedimentological interpretation of <span class="hlt">core</span> indicates that the dominant reservoir facies was deposited as high bed-load channels in a fluvially dominated deltaic complex. Reservoir sandstones are interpreted to be elongated and relatively continuous in a southwest-northeast direction. Concurrent crestal gas injection and downdip water injection will be used to maximize recovery. Barremian- to Albian-age Ben Nevis/Avalon sandstones are the secondary reservoirs and occur at an average <span class="hlt">drill</span> depth of 2,345 m (7,700 ft). <span class="hlt">Core</span> studies indicate deposition within transgressive shoreface and offshore shallow-marine environments. Thin bed stratigraphy predominates in this reservoir.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NSDL&redirectUrl=http://www.whoi.edu/instruments/viewInstrument.do?id=8087"><span id="translatedtitle">Deep Sea <span class="hlt">Coring</span></span></a></p> <p><a target="_blank" href="http://nsdl.org/nsdl_dds/services/ddsws1-1/service_explorer.jsp">NSDL National Science Digital Library</a></p> <p>Woods Hole Oceanographic Institution; Ocean and Climate Change Institute</p> <p></p> <p>This Ocean and Climate Change Institute module features a brief, but image-rich overview of ocean <span class="hlt">drilling</span> and sediment analysis to determine paleoclimate (past climate). This site is the first of a 3-page module, the other two sites (Describing the <span class="hlt">Core</span>; Sampling Techniques) are linked at the top of the article.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/170150"><span id="translatedtitle"><span class="hlt">Drilling</span> optimization: A new approach to optimize <span class="hlt">drilling</span> parameters and improve <span class="hlt">drilling</span> efficiency</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Cunha, J.C.S.; Prado, M.G.; Bonet, L. [Petrobras, Rio de Janeiro (Brazil); [Univ. of Tulsa, OK (United States)</p> <p>1995-12-31</p> <p>In this work a study of minimization of <span class="hlt">drilling</span> costs is presented and discussed. The <span class="hlt">drilling</span> cost will be analyzed not for one single bit, as usual, but for the <span class="hlt">drilling</span> operation of the entire well section from its initial to final depth. The costs that will be taken into account are those incurred during the <span class="hlt">drilling</span> operation. Other related costs like casing, cement, logging, etc., will not be considered in the problem since these costs will occur independent of the way that the well is <span class="hlt">drilled</span>. During the <span class="hlt">drilling</span> operation two major costs will be studied, the <span class="hlt">drilling</span> cost itself and the cost of tripping when changing bits. The main objective of this work is to find, for an entire <span class="hlt">drilling</span> section of the well, the optimum <span class="hlt">drilling</span> parameters for each bit, and the depth where each bit will be changed.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/6725340"><span id="translatedtitle"><span class="hlt">Drill</span> pipe corrosion control using an inert <span class="hlt">drilling</span> fluid</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Caskey, B.C.; Copass, K.S.</p> <p>1981-01-01</p> <p>The results of a geothermal <span class="hlt">drill</span> pipe corrosion field test are presented. When a low-density <span class="hlt">drilling</span> fluid was required for <span class="hlt">drilling</span> a geothermal well because of an underpressured, fractured formation, two <span class="hlt">drilling</span> fluids were alternately used to compare <span class="hlt">drill</span> pipe corrosion rates. The first fluid was an air-water mist with corrosion control chemicals. The other fluid was a nitrogen-water mist without added chemicals. The test was conducted during November 1980 at the Baca Location in northern New Mexico. Data from corrosion rings, corrosion probes, fluid samples and flow line instrumentation are plotted for the ten day test period. It is shown that the inert <span class="hlt">drilling</span> fluid, nitrogen, reduced corrosion rates by more than an order of magnitude. Test setup and procedures are also discussed. Development of an onsite inert gas generator could reduce the cost of <span class="hlt">drilling</span> geothermal wells by extending <span class="hlt">drill</span> pipe life and reducing corrosion control chemical costs.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5167031"><span id="translatedtitle">Ocean <span class="hlt">drilling</span> program with ten cruises completed</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Kidd, R.B.; Rabinowitz, P.D.</p> <p>1986-05-01</p> <p>With the end of Leg 110 in the Barbados forearc, JOIDES Resolution, the scientific drillship of the Ocean <span class="hlt">Drilling</span> Program, has now completed its first-phase Atlantic Ocean campaign. This paper focuses on the operational successes of the new program and identifies areas in which the authors expect further emphasis in the light of future scientific objectives. An initial thrust of the program toward high-latitude <span class="hlt">drilling</span> and zero-age ocean crustal <span class="hlt">drilling</span> was addressed through a major commitment to engineering development. The scientific laboratory complex aboard the drillship has undergone a thorough testing during this period, and new equipment development a modifications ensure that the facilities remain continually updated. High-latitude <span class="hlt">drilling</span> in the Labrador Sea and Baffin Bay (Leg 105) and in the Norwegian Sea (Leg 104) augur well for the proposed 1987 Antarctic expeditions, since the stability of the ship and its heave-compensation capabilities showed that weather and sea state present less of a problem to <span class="hlt">core</span> recovery than difficult downhole lithologies. Experience with the various engineering systems that made up the bare-rock spud-in assemblage on Legs 106 and 109 suggests that there will be a continued increase in emphasis on technical innovations in the new program.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2010EGUGA..1214783L"><span id="translatedtitle">Lake Van <span class="hlt">Drilling</span> Project 'PaleoVan' to be <span class="hlt">drilled</span> in summer 2010</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Litt, Thomas; Krastel, Sebastian; Anselmetti, Flavio; Kipfer, Rolf; Öcen, Sefer; Cagaty, Namik; Schmincke, Hans-Ulrich</p> <p>2010-05-01</p> <p>Lake Van is the fourth largest terminal lake in the world (volume 607 km3, area 3,570 km2, maximum depth 460 m), extending for 130 km WSW-ENE on the Eastern Anatolian High Plateau, Turkey. The annually-laminated sedimentary record of Lake Van promises to be an excellent palaeoclimate archive because it potentially yields a long and continuous continental sequence that covers several glacial-interglacial cycles (ca. 500 kyr). Therefore, Lake Van is a key site within the International Continental Scientific <span class="hlt">Drilling</span> Program (ICDP) for the investigation of the Quaternary climate evolution in the Near East. Based on the high-resolution seismic data and multidisciplinary scientific work, it is planned to <span class="hlt">drill</span> a series of sites in Lake Van in the frame of ICDP in summer 2010. The geochronological precision on a decadal or even annual scale will allow comparisons not only with astronomical cyclicity but also signals below the frequency of Milankovitch cycles, such as North Atlantic Oscillation, which may have also affected the past climate system of the eastern Mediterranean region. As a closed and saline lake, Lake Van reacts very sensitively to lake level changes caused by any alterations in the hydrological regime in response to climate change. Tephra layers, documented in short <span class="hlt">cores</span> and also expected in the deep <span class="hlt">drill</span> <span class="hlt">cores</span> of Lake Van sediments, allow reconstructing larger volcanic events and environmental impacts. The short <span class="hlt">cores</span> from Lake Van show also strong evidence of earthquake-triggered microfaults, interpreted as seismites. Similar features are expected to be found in the deeper sections. The unique setting of Lake Van, which records simultaneously the volcanic as well as the earthquake history, will also allow establishing possible coincidence between larger earthquakes and volcanic events. Preparation of the <span class="hlt">drilling</span> campaign is almost finished and <span class="hlt">drilling</span> is scheduled to start in July 2010.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6422526"><span id="translatedtitle"><span class="hlt">Drilling</span> mud proposal</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Steed, W.</p> <p>1981-12-01</p> <p>A discussion of the disposal of <span class="hlt">drilling</span> fluids from Texas oil fields was presented. The most common is the transport of the <span class="hlt">drilling</span> mud to approved landfills. This requires that the waste be fresh waste base mud only, contained in the pit, and be maintained oil free. Other approved methods of disposal include treatment with discharge of effluent to surface streams, land application on farm land (with owner's permission), and subsurface disposal. Some common illegal disposal methods included dumping on roadsides or private property (without owner's permission).</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/891973"><span id="translatedtitle">Critique of <span class="hlt">Drilling</span> Research</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Hamblin, Jerry</p> <p>1992-03-24</p> <p>For a number of years the Department of Energy has been funding research to reduce the cost of <span class="hlt">drilling</span> geothermal wells. Generally that research has been effective and helped to make geothermal energy economically attractive to developers. With the increased competition for the electrical market, geothermal energy needs every advantage it can acquire to allow it to continue as a viable force in the marketplace. In <span class="hlt">drilling</span> related research, there is essentially continuous dialogue between industry and the national laboratories. Therefore, the projects presented in the Program Review are focused on subjects that were previously recommended or approved by industry.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/3039675"><span id="translatedtitle">Environmental and Engineering <span class="hlt">Geophysics</span></span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Prem V. Sharma</p> <p>1997-01-01</p> <p><span class="hlt">Geophysical</span> imaging methods provide solutions to a wide variety of environmental and engineering problems: protection of soil and groundwater from contamination; disposal of chemical and nuclear waste; geotechnical site testing; landslide and ground subsidence hazard detection; location of archaeological artifacts. This book comprehensively describes the theory, data acquisition and interpretation of all of the principal techniques of <span class="hlt">geophysical</span> surveying: gravity,</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/926665"><span id="translatedtitle">Laser <span class="hlt">Drilling</span> - <span class="hlt">Drilling</span> with the Power of Light</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Iraj A. Salehi; Brian C. Gahan; Samih Batarseh</p> <p>2007-02-28</p> <p>Gas Technology Institute (GTI) has been the leading investigator in the field of high power laser applications research for well construction and completion applications. Since 1997, GTI (then as Gas Research Institute- GRI) has investigated several military and industrial laser systems and their ability to cut and <span class="hlt">drill</span> into reservoir type rocks. In this report, GTI continues its investigation with a 5.34 kW ytterbium-doped multi-clad high power fiber laser (HPFL). When compared to its competitors; the HPFL represents a technology that is more cost effective to operate, capable of remote operations, and requires considerably less maintenance and repair. Work performed under this contract included design and implementation of laboratory experiments to investigate the effects of high power laser energy on a variety of rock types. All previous laser/rock interaction tests were performed on samples in the lab at atmospheric pressure. To determine the effect of downhole pressure conditions, a sophisticated tri-axial cell was designed and tested. For the first time, Berea sandstone, limestone and clad <span class="hlt">core</span> samples were lased under various combinations of confining, axial and pore pressures. Composite <span class="hlt">core</span> samples consisted of steel cemented to rock in an effort to represent material penetrated in a cased hole. The results of this experiment will assist in the development of a downhole laser perforation or side tracking prototype tool. To determine how this promising laser would perform under high pressure in-situ conditions, GTI performed a number of experiments with results directly comparable to previous data. Experiments were designed to investigate the effect of laser input parameters on representative reservoir rock types of sandstone and limestone. The focus of the experiments was on laser/rock interaction under confining pressure as would be the case for all <span class="hlt">drilling</span> and completion operations. As such, the results would be applicable to <span class="hlt">drilling</span>, perforation, and side tracking applications. In the past, several combinations of laser and rock variables were investigated at standard conditions and reported in the literature. More recent experiments determined the technical feasibility of laser perforation on multiple samples of rock, cement and steel. The fiber laser was capable of penetrating these materials under a variety of conditions, to an appropriate depth, and with reasonable energy requirements. It was determined that fiber lasers are capable of cutting rock without causing damage to flow properties. Furthermore, the laser perforation resulted in permeability improvements on the exposed rock surface. This report has been prepared in two parts and each part may be treated as a stand-alone document. Part 1 (High Energy Laser <span class="hlt">Drilling</span>) includes the general description of the concept and focuses on results from experiments under the ambient lab conditions. Part 2 (High Energy Laser Perforation and Completion Techniques) discusses the design and development of a customized laser pressure cell; experimental design and procedures, and the resulting data on pressure-charged samples exposed to the laser beam. An analysis provides the resulting effect of downhole pressure conditions on the laser/rock interaction process.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=19860000266&hterms=oil+drill&qs=N%3D0%26Ntk%3DAll%26Ntx%3Dmode%2Bmatchall%26Ntt%3Doil%2Bdrill"><span id="translatedtitle">Modified Cobalt <span class="hlt">Drills</span> With Oil Passages</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Hutchison, E.; Richardson, D.</p> <p>1986-01-01</p> <p>Oil forced through <span class="hlt">drill</span> shanks to lubricate cutting edges. <span class="hlt">Drill</span> bits cooled and lubricated by oil forced through <span class="hlt">drill</span> shanks and out holes adjacent to bits. This cooling technique increases drillbit life and allows increased <span class="hlt">drill</span> feed rates.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://oaktrust.library.tamu.edu//handle/1969.1/3884"><span id="translatedtitle">Managed pressure <span class="hlt">drilling</span> techniques and tools </span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Martin, Matthew Daniel</p> <p>2006-08-16</p> <p>The economics of <span class="hlt">drilling</span> offshore wells is important as we <span class="hlt">drill</span> more wells in deeper water. <span class="hlt">Drilling</span>-related problems, including stuck pipe, lost circulation, and excessive mud cost, show the need for better <span class="hlt">drilling</span> ...</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/867115"><span id="translatedtitle">Combination <span class="hlt">drilling</span> and skiving tool</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Stone, William J. (Kansas City, MO)</p> <p>1989-01-01</p> <p>A combination <span class="hlt">drilling</span> and skiving tool including a longitudinally extending hollow skiving sleeve slidably and concentrically mounted on a right-handed twist <span class="hlt">drill</span>. Dogs or pawls provided on the internal periphery of the skiving sleeve engage with the helical grooves of the <span class="hlt">drill</span>. During a clockwise rotation of the tool, the <span class="hlt">drill</span> moves downwardly and the sleeve translates upwardly, so that the <span class="hlt">drill</span> performs a <span class="hlt">drilling</span> operation on a workpiece. On the other hand, the <span class="hlt">drill</span> moves upwardly and the sleeve translates downwardly, when the tool is rotated in a counter-clockwise direction, and the sleeve performs a skiving operation. The <span class="hlt">drilling</span> and skiving operations are separate, independent and exclusive of each other.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/26129810"><span id="translatedtitle"><span class="hlt">Drilling</span> holes in tube sheets</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>A. I. Elizarov</p> <p>1982-01-01</p> <p><span class="hlt">Drilling</span> holes in the tube sheets of shell-and-tube heat exhangers, condensers, and evaporators is one of the most laborious and low-production operations. This is primarily the result of the low life of <span class="hlt">drills</span>. Experimental work and the experience of various plants has shown that to increase the life of standard high-speed steel spiral <span class="hlt">drills</span> in <span class="hlt">drilling</span> holes in stainless steels</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2015AcAau.110...99P"><span id="translatedtitle">Seismic While <span class="hlt">Drilling</span> (SWD) methodology in support to Moon subsurface stratigraphy investigations</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Poletto, Flavio; Magnani, Piergiovanni; Gelmi, Rolando; Corubolo, Piero; Re, Edoardo; Schleifer, Andrea; Perrone, Antonio; Salonico, Antonio; Coste, Pierre</p> <p>2015-05-01</p> <p>The knowledge of the Moon subsoil <span class="hlt">geophysical</span> properties is of great importance, for scientific reasons for the development of the Lunar exploration activities and the envisaged exploitation of its planetary resources. The Moon surface is characterized by the presence of regolith, a powdered material made up of unconsolidated, porous and highly brecciated rock fragments of several different grain sizes and lithologies. Beneath the regolith, a transition zone showing higher acoustic velocities may be present down to the solid bedrock. The bedrock consists of basaltic layers characterized by high seismic velocity and low seismic attenuation. In these conditions, human civil engineering and rover activities, including <span class="hlt">drilling</span> may be subject to risk due to the lack of knowledge of the complex subsoil properties. Seismic While <span class="hlt">Drilling</span> is a method used on Earth to support from <span class="hlt">geophysical</span> point of view the <span class="hlt">drilling</span> for oil and gas and geothermal exploration. In this application, the characterization of the stratigraphy by vertical seismic profiles in the <span class="hlt">drilled</span> section, providing seismic images of the to-be-<span class="hlt">drilled</span> substructures, is obtained using the <span class="hlt">drill</span>-bit radiated energy. We present the result of a project that studies the adaptation of the method for Lunar <span class="hlt">drilling</span> purposes, taking into account the specific issues related to the Moon environment and remote communication aspects. The results of a laboratory test conducted in the framework of a European Space Agency project (completed in 2009) with a planetary <span class="hlt">drill</span> prototype and a simulator of a complete remote system are presented and discussed together with the perspectives for the seismic-while-<span class="hlt">drilling</span> application for planetary missions.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/5060475"><span id="translatedtitle">Case study of the Wendel-Amedee Exploration <span class="hlt">Drilling</span> Project, Lassen County, California, User Coupled Confirmation <span class="hlt">Drilling</span> Program</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Zeisloft, J.; Sibbett, B.S.; Adams, M.C.</p> <p>1984-09-01</p> <p>The Wendel-Amedee KGRA is located in Honey Lake basin in Lassen County, California, on the boundary between the Modoc Plateau and the Basin and Range geologic provinces. A variety of <span class="hlt">geophysical</span> surveys was performed over the project property. <span class="hlt">Geophysical</span> data helped in establishing the regional structural framework, however, none of the <span class="hlt">geophysical</span> data is sufficiently refined to be considered suitable for the purpose of siting an exploration <span class="hlt">drill</span> hole. <span class="hlt">Drilling</span> of reservoir confirmation well WEN-1 took place from August 1 to September 22, 1981. Pulse and long-term flow testing subjected the reservoir to a maximum flow of 680 gpm for 75 hours. At that rate, the well exhibited a productivity index of 21.6 gpm/psi; the reservoir transmissivity was 3.5 x 10/sup 6/ md-ft/cp. The maximum bottom-hole temperature recorded during testing was 251/sup 0/F. The conceptual model of the geothermal resource at Wendel Hot Springs calls on ground water, originating in the neighboring volcanic highlands, descending through jointed and otherwise permeable rocks into the granitic basement. Once in the basement, the fluid is heated as it continues its descent, and lateral movement as dictated by the hydrologic gradient. It then rises to the discharge point along transmissive faults. 45 refs., 28 figs., 3 tabs.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2015EGUGA..1713789L"><span id="translatedtitle">Integration of borehole <span class="hlt">geophysical</span> properties into surface multichannel seismic data sets: First results from the SCOPSCO ICDP project</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lindhorst, Katja; Krastel, Sebastian; Baumgarten, Henrike; Wonik, Thomas; Francke, Alexander; Wagner, Bernd</p> <p>2015-04-01</p> <p>Lake Ohrid (Macedonia/Albania), located on the Balkan Peninsula within the Dinaride-Hellenide-Albanide mountain belt is probably the oldest, continuously existing lake in Europe (2-5 Ma). Multidisciplinary studies at Lake Ohrid prove that it is an important archive to study the sedimentary and tectonic evolution of a graben system over a long time period. Within the frame of the International Continental <span class="hlt">Drilling</span> Program (ICDP) a successful deep <span class="hlt">drilling</span> campaign was carried out in spring 2013 with more than 2000 m of sediment <span class="hlt">cores</span> at four sites. Downhole logging was realized at each site after <span class="hlt">coring</span>, enabling us to integrate <span class="hlt">geophysical</span> and sedimentological data into seismic cross sections in order to get a profound knowledge of climatic and environmental changes in the catchment area. The longest record (~569 m, site DEEP), recovered in the central part of lake Ohrid likely covers the entire lacustrine succession within Lake Ohrid Basin including several Interglacial and Glacial cycles. Sedimentological analyses are still ongoing; however, the upper 260 m of the DEEP reflecting the time period between Mid-Pleistocene Transition to present. An integration of borehole <span class="hlt">geophysical</span> data into surface seismic lines shows that sediments, within the central part of Lake Ohrid, were deposited in a deep water environment over the last 600 ka. For the uppermost sediment cover, about 50 m of penetration, a very high resolution sediment echosounder data set allows us to identify major tephra layers and track them through the entire deep basin. Furthermore, a vertical seismic profile was carried out at site DEEP resulting in a conversion from two-way-travel-time into sediment depth. One major outcome is a corridor stack of the upgoing wave that clearly shows several reflectors linked to changes of sediment properties of <span class="hlt">cores</span> and hence environmental and climate changes in the surrounding area of Lake Ohrid Basin. Several changes from Glacial to Interglacial, and vice versa, have been observed in the seismic data. Using a preliminary age model for interpreting physical parameters such as natural gamma ray, magnetic susceptibility, and sonic velocity shed light on causes and timing of additional reflectors at the site where the DEEP hole was <span class="hlt">cored</span> in 2013. A grid of surface seismic lines enables us to expand this to the entire central basin and to reconstruct the sedimentary history of Lake Ohrid suggesting that the deep basin was in a rather stable condition with a water depth greater than a 100m.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www-odp.tamu.edu/publications/prosp/208_prs/208prosp.pdf"><span id="translatedtitle">November 2002 OCEAN <span class="hlt">DRILLING</span> PROGRAM</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>November 2002 OCEAN <span class="hlt">DRILLING</span> PROGRAM LEG 208 SCIENTIFIC PROSPECTUS EARLY CENOZOIC EXTREME CLIMATES -------------------------------- Dr. Jack Baldauf Deputy Director of Science Operations Ocean <span class="hlt">Drilling</span> Program Texas A&M University Leg Project Manager and Staff Scientist Ocean <span class="hlt">Drilling</span> Program Texas A&M University 1000 Discovery</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li class="active"><span>21</span></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_21 --> <div id="page_22" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li class="active"><span>22</span></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="421"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www-odp.tamu.edu/publications/prosp/209_prs/209prosp.pdf"><span id="translatedtitle">November 2002 OCEAN <span class="hlt">DRILLING</span> PROGRAM</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>November 2002 OCEAN <span class="hlt">DRILLING</span> PROGRAM LEG 209 SCIENTIFIC PROSPECTUS <span class="hlt">DRILLING</span> MANTLE PERIDOTITE ALONG 20036 USA -------------------------------- Dr. Jack Baldauf Deputy Director of Science Operations Ocean -------------------------------- Dr. D. Jay Miller Leg Project Manager and Staff Scientist Ocean <span class="hlt">Drilling</span> Program Texas A&M University</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www-odp.tamu.edu/publications/prosp/204_prs/204prs1.pdf"><span id="translatedtitle">February 2002 OCEAN <span class="hlt">DRILLING</span> PROGRAM</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>February 2002 OCEAN <span class="hlt">DRILLING</span> PROGRAM LEG 204 SCIENTIFIC PROSPECTUS <span class="hlt">DRILLING</span> GAS HYDRATES ON HYDRATE Services Wischhofstrasse 1-3 24148 Kiel Germany Dr. Anne Trehu College of Oceanic and Atmospheric Sciences -------------------------------- Dr. Jack Baldauf Deputy Director of Science Operations Ocean <span class="hlt">Drilling</span> Program Texas A&M University</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www.ldeo.columbia.edu/files/uploaded/ICDP%2007%202011%20decision%20and%20reviews.pdf"><span id="translatedtitle">INTERNATIONAL CONTINENTAL SCIENTIFIC <span class="hlt">DRILLING</span> PROGRAM</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>, Germany June 22, 2011 07-2011 Revised Workshop Proposal Oman Ophiolite <span class="hlt">Drilling</span> Project, Workshop Proposal, Thank you very much for submitting a Workshop Proposal on the "Oman Ophiolite <span class="hlt">Drilling</span> Project", which such as the contact to the Tibetan Ophiolite <span class="hlt">Drilling</span> scientists, and for OSG support measures. I wish you successful</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://oaktrust.library.tamu.edu//handle/1969.1/4792"><span id="translatedtitle">Foam <span class="hlt">drilling</span> simulator </span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Paknejad, Amir Saman</p> <p>2007-04-25</p> <p>....................................................17 Pressure Drop Across Bit Nozzles..............................................18 Heat Capacity..............................................................................19 III FOAM <span class="hlt">DRILLING</span> SIMULATOR... , ...............................................................................................................(2.25) where; =b Pressure drop across the bit Pbh = Bottom-hole pressure nn = Nozzle velocity M = Gas molecular weight mg = Mass of gas ml = Mass of liquid Heat Capacity Like any two-phase mixture, heat capacity of foam is the average...</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=ERIC&redirectUrl=http://eric.ed.gov/?q=interview+AND+validity+AND+entry+AND+level+AND+jobs&id=ED236427"><span id="translatedtitle"><span class="hlt">Drill</span> Press Work Sample.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Shawsheen Valley Regional Vocational-Technical High School, Billerica, MA.</p> <p></p> <p>This manual contains a work sample intended to assess a handicapped student's interest in and to screen interested students into a training program in basic machine shop I. (The course is based on the entry level of the <span class="hlt">drill</span> press operator.) Section 1 describes the assessment, correlates the work performed and worker traits required for…</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-DOEDE&redirectUrl=http://www.osti.gov/dataexplorer/biblio/1148824"><span id="translatedtitle">Proposed <span class="hlt">Drill</span> Sites</span></a></p> <p><a target="_blank" href="http://www.osti.gov/dataexplorer">DOE Data Explorer</a></p> <p>Lane, Michael</p> <p></p> <p>Proposed <span class="hlt">drill</span> sites for intermediate depth temperature gradient holes and/or deep resource confirmation wells. Temperature gradient contours based on shallow TG program and faults interpreted from seismic reflection survey are shown, as are two faults interpreted by seismic contractor Optim but not by Oski Energy, LLC.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://uhv.cheme.cmu.edu/procedures/machining/ch4.pdf"><span id="translatedtitle"><span class="hlt">DRILLING</span> MACHINES GENERAL INFORMATION</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Gellman, Andrew J.</p> <p></p> <p>hand-held power <span class="hlt">drills</span> to bench mounted and finally floor-mounted models. They can perform operations tool is withdrawn from 4-2 the work. Feed pressure applied to the sleeve by hand or power causes. Wipe all spindles and sleeves free of grit to a</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/50659201"><span id="translatedtitle"><span class="hlt">Drill</span> sergeant selection model</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>T. Barker; S. Gouthro; J. Jarvis; R. Markham; J. Halstead</p> <p>2008-01-01</p> <p>This research aims to strengthen the current utility of the Warrior Attributes Inventory (WAI), formerly known as the Non Commissioned Officer Leadership Skills Inventory (NLSI). The end state of the research is to create a model that will accurately predict potential <span class="hlt">drill</span> sergeant performance based upon WAI scores and biographical data. The research leverages statistical learning methods and the United</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/54007014"><span id="translatedtitle">Deep Sea <span class="hlt">Drilling</span> Project: Properties of igneous and metamorphic rocks of the oceanic crust</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>N. I. Christensen; F. Frey; D. MacDougall; W. G. Melson; M. N. A. Peterson; G. Thompson; N. Watkins</p> <p>1973-01-01</p> <p>The conference was held at a critical time in the development of our knowledge of the oceanic crust as revealed by the Deep Sea <span class="hlt">Drilling</span> Project (DSDP). The increased <span class="hlt">drilling</span> capabilities, including a number of new systems such as heave compensation, improved bits and <span class="hlt">core</span> recovery, and reentry capability, now allow us to explore and sample the deep oceanic crust</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/60039565"><span id="translatedtitle">Effect of <span class="hlt">drilling</span> fluids on permeability of uranium sandstone. Report of Investigations\\/1984</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>J. K. Ahlness; D. I. Johnson; D. R. Tweeton</p> <p>1984-01-01</p> <p>The Bureau of Mines conducted laboratory and field experiments to determine the amount of permeability reduction in uranium sandstone after its exposure to different <span class="hlt">drilling</span> fluids. Seven polymer and two bentonite fluids were laboratory-tested in their clean condition, and six polymer fluids were tested with simulated <span class="hlt">drill</span> cuttings added. Sandstone <span class="hlt">cores</span> cut from samples collected at an open pit uranium</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2011AGUFMGC44A..08Z"><span id="translatedtitle"><span class="hlt">Geophysical</span> Characterization of Fractured-Rock Aquifers for CO2 Injection in the Northeastern Newark Basin</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zakharova, N. V.; Goldberg, D.; Matter, J. M.; Stute, M.; Takahashi, T.; O'Mullan, G. D.; Yang, Q.; Shao, A.; Clauson, K.; Umemoto, K.; Ai, S.</p> <p>2011-12-01</p> <p>One of the primary objectives for secure CO2 geologic storage is identifying suitable locations and developing accurate formation evaluation. Borehole <span class="hlt">geophysics</span> provides a set of effective techniques for reservoir and seal characterization at an intermediate scale, filling the gap between large-scale surface surveys and <span class="hlt">core</span>-scale analysis. In this study we analyze borehole <span class="hlt">geophysical</span> logs obtained for small-scale CO2 injection experiments in northeastern Newark basin, transecting Jurassic igneous intrusion (the Palisades sill) and Triassic lacustrine sediments that both contain fractured-rock intervals. We present new insights into the Newark basin stratigraphy and aquifer properties based on these borehole data and discuss the advantages and limitations of various logging methods for characterization of fractured reservoirs and seals. High-resolution logging data have been obtained over a 1500-ft interval in the well, including caliper, apparent resistivity, gamma ray, and temperature logs, flowmeter measurements and optical and acoustic televiewer images. Rock chips were recovered during <span class="hlt">drilling</span>, but no <span class="hlt">coring</span> was done. We analyze these data with a specific focus on reservoir and seal properties in the fractured sedimentary intervals. Electrical, acoustic, and nuclear logs are used to evaluate porosity and identify potential injection reservoirs and impermeable cap rocks. Sharp changes in borehole fluid resistivity and temperature gradient indicate several conductive zones potentially suitable for fluid injection and are confirmed by flowemeter and hydraulic experiments. Analysis of high-quality optical borehole televiewer (OTV) images provides structural information about sedimentary bedding and fracture distribution. The layers dip in northwestern direction at about 10-degree angle. Combined with <span class="hlt">drill</span> cuttings, OTV images also allow for reconstruction of a complete lithologic profile. OTV images reveal two sets of fractures, mostly dominated by large-aperture high-angle fractures, but they are not directly correlated with hydraulically conductive zones. Some of the most prominent fractures are obvious flow pathways, while others are less conductive, and a few do not exhibit any flow at all. The high-angle fractures strike predominantly in NE-SW direction, consistent with an extensional stress regime generated during initial rifting of the Newark basin. Conductive zones are separated by relatively thick intervals of low-porosity unfractured siltstone that can potentially serve as caprock for injected fluids.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/170151"><span id="translatedtitle">Advances in electronic pressure indication and resulting <span class="hlt">drilling</span> application breakthroughs</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Condon, W.S. [Houston Digital Instruments, Inc., Houston, TX (United States); Quentin, K.M. [Well Control and Systems Design, Inc., Houston, TX (United States)</p> <p>1995-12-31</p> <p>Pressure is the <span class="hlt">core</span> process variable of all <span class="hlt">drilling</span> programs. This paper expounds on technological advances achieved over the past four years in the design of electronic pressure indication instrumentation and several prominent <span class="hlt">drilling</span> application breakthroughs resulting from these design enhancements. Currently, industry focus on pressure indication is impeded by reliance on older, hydraulic technology with its attendant linearity and maintenance/downtime problems. Limited accuracy and poor linearity stifles creative conception of pressure management techniques that could result in greater <span class="hlt">drilling</span> optimization. Utilizing electronic pressure indication instruments can be justified on either well specific or overall operating considerations for all but the most rudimentary <span class="hlt">drilling</span> programs. Importantly, enhancements have evolved without the high costs normally associated with new technology.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6367530"><span id="translatedtitle">Mixer for <span class="hlt">drill</span> cuttings and <span class="hlt">drilling</span> mud on a <span class="hlt">drilling</span> location</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>van der Laan, J. G. J.; Entrop, W.</p> <p>1985-05-14</p> <p>A device for mixing of liquids and particulate solids, such as for instance a <span class="hlt">drilling</span> liquid and <span class="hlt">drill</span> cuttings on a <span class="hlt">drilling</span> location. This <span class="hlt">drilling</span> location can be a deep well <span class="hlt">drilled</span> for gas and/or oil by means of a <span class="hlt">drilling</span> tower on-or off-shore. The invention provides an elongated, rectangular open mixing tank on which a series of replacable agitating units having their axes in one vertical plane is mounted. The agitating devices each comprise a unit having a rotatably driven head carrying two support arms of unequal length which each support a mixing screw projecting into the mixture of liquids and particulate solids. This arrangement provides a thorough mixture of the <span class="hlt">drilling</span> liquid, having a high viscosity and high specific gravity, with the <span class="hlt">drill</span> cuttings frequently comprising heavy clay and/or rock particles.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=20120013241&hterms=aggressive&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D30%26Ntt%3Daggressive"><span id="translatedtitle">Mars Science Laboratory <span class="hlt">Drill</span></span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Okon, Avi B.; Brown, Kyle M.; McGrath, Paul L.; Klein, Kerry J.; Cady, Ian W.; Lin, Justin Y.; Ramirez, Frank E.; Haberland, Matt</p> <p>2012-01-01</p> <p>This <span class="hlt">drill</span> (see Figure 1) is the primary sample acquisition element of the Mars Science Laboratory (MSL) that collects powdered samples from various types of rock (from clays to massive basalts) at depths up to 50 mm below the surface. A rotary-percussive sample acquisition device was developed with an emphasis on toughness and robustness to handle the harsh environment on Mars. It is the first rover-based sample acquisition device to be flight-qualified (see Figure 2). This <span class="hlt">drill</span> features an autonomous tool change-out on a mobile robot, and novel voice-coil-based percussion. The <span class="hlt">drill</span> comprises seven subelements. Starting at the end of the <span class="hlt">drill</span>, there is a bit assembly that cuts the rock and collects the sample. Supporting the bit is a subassembly comprising a chuck mechanism to engage and release the new and worn bits, respectively, and a spindle mechanism to rotate the bit. Just aft of that is a percussion mechanism, which generates hammer blows to break the rock and create the dynamic environment used to flow the powdered sample. These components are mounted to a translation mechanism, which provides linear motion and senses weight-on-bit with a force sensor. There is a passive-contact sensor/stabilizer mechanism that secures the <span class="hlt">drill</span> fs position on the rock surface, and flex harness management hardware to provide the power and signals to the translating components. The <span class="hlt">drill</span> housing serves as the primary structure of the turret, to which the additional tools and instruments are attached. The <span class="hlt">drill</span> bit assembly (DBA) is a passive device that is rotated and hammered in order to cut rock (i.e. science targets) and collect the cuttings (powder) in a sample chamber until ready for transfer to the CHIMRA (Collection and Handling for Interior Martian Rock Analysis). The DBA consists of a 5/8-in. (.1.6- cm) commercial hammer <span class="hlt">drill</span> bit whose shank has been turned down and machined with deep flutes designed for aggressive cutting removal. Surrounding the shank of the bit is a thick-walled maraging steel collection tube allowing the powdered sample to be augured up the hole into the sample chamber. For robustness, the wall thickness of the DBA was maximized while still ensuring effective sample collection. There are four recesses in the bit tube that are used to retain the fresh bits in their bit box. The rotating bit is supported by a back-to-back duplex bearing pair within a housing that is connected to the outer DBA housing by two titanium diaphragms. The only bearings on the <span class="hlt">drill</span> in the sample flow are protected by a spring-energized seal, and an integrated shield that diverts the ingested powdered sample from the moving interface. The DBA diaphragms provide radial constraint of the rotating bit and form the sample chambers. Between the diaphragms there is a sample exit tube from which the sample is transferred to the CHIMRA. To ensure that the entire collected sample is retained, no matter the orientation of the <span class="hlt">drill</span> with respect to gravity during sampling, the pass-through from the forward to the aft chamber resides opposite to the exit tube.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/59847"><span id="translatedtitle">Application of <span class="hlt">geophysical</span> logs to estimate moisture-content profiles in unsaturated tuff, Yucca Mountain, Nevada</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Palaz, I.</p> <p>1985-12-31</p> <p>Determination of the moisture content in boreholes, <span class="hlt">drilled</span> for the purpose of conducting hydrological studies in the unsaturated zone, is critical in the evaluation of the natural state of the unsaturated zone. <span class="hlt">Geophysical</span> logs combined with geologic and hydrologic examination of the borehole cuttings provide a means to estimate moisture-content profiles. Interpretations of <span class="hlt">geophysical</span> well logs for unsaturated, welded, and fractured tuff have not been attempted previously. This paper compares the results of analyses of various <span class="hlt">geophysical</span> logs that were obtained from two large diameter, air-<span class="hlt">drilled</span> (vacuum reverse circulation) boreholes at Yucca Mountain, Nevada, that were <span class="hlt">drilled</span> as part of the Nevada Nuclear Waste Storage Investigations Project of the US Department of Energy. Caliper, gamma-ray, temperature, induction, density, epithermal-neutron, and dielectric logs were run in these boreholes. Moisture-content data from the <span class="hlt">drill</span> cuttings were compared with moisture-content data derived from logs. Saturation profiles were obtained from different logs and were correlated with each other. Qualitative correlation of the degree of welding with bulk density also was conducted; overall correlations were satisfactory. Borehole <span class="hlt">geophysical</span> logs proved reliable in determining moisture-content profiles. 6 refs., 9 figs.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/5747525"><span id="translatedtitle">Exploration geothermal gradient <span class="hlt">drilling</span>, Platanares, Honduras, Central America</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Goff, S.J.; Laughlin, A.W.; Ruefenacht, H.D.; Goff, F.E.; Heiken, G.; Ramos, N.</p> <p>1988-01-01</p> <p>This paper is a review and summary of the <span class="hlt">core</span> <span class="hlt">drilling</span> operations component of the Honduras Geothermal Resource Development Project at the Platanares geothermal prospect in Honduras, Central America. Three intermediate depth (428 to 679 m) coreholes are the first continuously <span class="hlt">cored</span> geothermal exploration boreholes in Honduras. These <span class="hlt">coring</span> operations are part of the Central America Energy Resource Project (CAERP) effort funded by the Agency for International Development (AID) and implemented by the Los Alamos National Laboratory (Los Alamos) in cooperation with the Empresa Nacional de Energia Electrica (ENEE) and the United States Geological Survey (USGS). This report emphasizes <span class="hlt">coring</span> operations with reference to the stratigraphy, thermal gradient, and flow test data of the boreholes. The primary objectives of this <span class="hlt">coring</span> effort were (1) to obtain quantitative information on the temperature distribution as a function of depth, (2) to recover fluids associated with the geothermal reservoir, (3) to recover 75% or better <span class="hlt">core</span> from the subsurface rock units, and (4) to <span class="hlt">drill</span> into the subsurface rock as deeply as possible in order to get information on potential reservoir rocks, fracture density, permeabilities, and alteration histories of the rock units beneath the site. The three exploration coreholes <span class="hlt">drilled</span> to depths of 650, 428 and 679 m, respectively, encountered several hot water entries. <span class="hlt">Coring</span> operations and associated testing began in mid-October 1986 and were completed at the end of June 1987.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=20050161944&hterms=student+stress+australia&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dstudent%2Bstress%2Baustralia"><span id="translatedtitle">Planetary <span class="hlt">Geophysics</span> and Tectonics</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Zuber, Maria</p> <p>2005-01-01</p> <p>The broad objective of this work is to improve understanding of the internal structures and thermal and stress histories of the solid planets by combining results from analytical and computational modeling, and <span class="hlt">geophysical</span> data analysis of gravity, topography and tectonic surface structures. During the past year we performed two quite independent studies in the attempt to explain the Mariner 10 magnetic observations of Mercury. In the first we revisited the possibility of crustal remanence by studying the conditions under which one could break symmetry inherent in Runcorn's model of a uniformly magnetized shell to produce a remanent signal with a dipolar form. In the second we applied a thin shell dynamo model to evaluate the range of intensity/structure for which such a planetary configuration can produce a dipole field consistent with Mariner 10 results. In the next full proposal cycle we will: (1) develop numerical and analytical and models of thin shell dynamos to address the possible nature of Mercury s present-day magnetic field and the demise of Mars magnetic field; (2) study the effect of degree-1 mantle convection on a <span class="hlt">core</span> dynamo as relevant to the early magnetic field of Mars; (3) develop models of how the deep mantles of terrestrial planets are perturbed by large impacts and address the consequences for mantle evolution; (4) study the structure, compensation, state of stress, and viscous relaxation of lunar basins, and address implications for the Moon s state of stress and thermal history by modeling and gravity/topography analysis; and (5) use a three-dimensional viscous relaxation model for a planet with generalized vertical viscosity distribution to study the degree-two components of the Moon's topography and gravity fields to constrain the primordial stress state and spatial heterogeneity of the crust and mantle.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/ofr20061257"><span id="translatedtitle">An Introduction to Using Surface <span class="hlt">Geophysics</span> to Characterize Sand and Gravel Deposits</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Lucius, Jeffrey E.; Langer, William H.; Ellefsen, Karl J.</p> <p>2006-01-01</p> <p>This report is an introduction to surface <span class="hlt">geophysical</span> techniques that aggregate producers can use to characterize known deposits of sand and gravel. Five well-established and well-tested <span class="hlt">geophysical</span> methods are presented: seismic refraction and reflection, resistivity, ground penetrating radar, time-domain electromagnetism, and frequency-domain electromagnetism. Depending on site conditions and the selected method(s), <span class="hlt">geophysical</span> surveys can provide information concerning aerial extent and thickness of the deposit, thickness of overburden, depth to the water table, critical geologic contacts, and location and correlation of geologic features. In addition, <span class="hlt">geophysical</span> surveys can be conducted prior to intensive <span class="hlt">drilling</span> to help locate auger or <span class="hlt">drill</span> holes, reduce the number of <span class="hlt">drill</span> holes required, calculate stripping ratios to help manage mining costs, and provide continuity between sampling sites to upgrade the confidence of reserve calculations from probable reserves to proved reserves. Perhaps the greatest value of <span class="hlt">geophysics</span> to aggregate producers may be the speed of data acquisition, reduced overall costs, and improved subsurface characterization.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=USGSPUBS&redirectUrl=http://pubs.er.usgs.gov/publication/cir1310"><span id="translatedtitle">An Introduction to Using Surface <span class="hlt">Geophysics</span> to Characterize Sand and Gravel Deposits</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Lucius, Jeffrey E.; Langer, William H.; Ellefsen, Karl J.</p> <p>2007-01-01</p> <p>This report is an introduction to surface <span class="hlt">geophysical</span> techniques that aggregate producers can use to characterize known deposits of sand and gravel. Five well-established and well-tested <span class="hlt">geophysical</span> methods are presented: seismic refraction and reflection, resistivity, ground penetrating radar, time-domain electromagnetism, and frequency-domain electromagnetism. Depending on site conditions and the selected method(s), <span class="hlt">geophysical</span> surveys can provide information concerning areal extent and thickness of the deposit, thickness of overburden, depth to the water table, critical geologic contacts, and location and correlation of geologic features. In addition, <span class="hlt">geophysical</span> surveys can be conducted prior to intensive <span class="hlt">drilling</span> to help locate auger or <span class="hlt">drill</span> holes, reduce the number of <span class="hlt">drill</span> holes required, calculate stripping ratios to help manage mining costs, and provide continuity between sampling sites to upgrade the confidence of reserve calculations from probable reserves to proved reserves. Perhaps the greatest value of <span class="hlt">geophysics</span> to aggregate producers may be the speed of data acquisition, reduced overall costs, and improved subsurface characterization.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/238183"><span id="translatedtitle">Cost effectiveness of sonic <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Masten, D.; Booth, S.R.</p> <p>1996-03-01</p> <p>Sonic <span class="hlt">drilling</span> (combination of mechanical vibrations and rotary power) is an innovative environmental technology being developed in cooperation with DOE`s Arid-Site Volatile Organic Compounds Integrated Demonstration at Hanford and the Mixed Waste Landfill Integrated Demonstration at Sandia. This report studies the cost effectiveness of sonic <span class="hlt">drilling</span> compared with cable-tool and mud rotary <span class="hlt">drilling</span>. Benefit of sonic <span class="hlt">drilling</span> is its ability to <span class="hlt">drill</span> in all types of formations without introducing a circulating medium, thus producing little secondary waste at hazardous sites. Progress has been made in addressing the early problems of failures and downtime.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li class="active"><span>22</span></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_22 --> <div id="page_23" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li class="active"><span>23</span></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="441"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/1015446"><span id="translatedtitle">Smaller Footprint <span class="hlt">Drilling</span> System for Deep and Hard Rock Environments; Feasibility of Ultra-High-Speed Diamond <span class="hlt">Drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>TerraTek, A Schlumberger Company</p> <p>2008-12-31</p> <p>The two phase program addresses long-term developments in deep well and hard rock <span class="hlt">drilling</span>. TerraTek believes that significant improvements in <span class="hlt">drilling</span> deep hard rock will be obtained by applying ultra-high rotational speeds (greater than 10,000 rpm). The work includes a feasibility of concept research effort aimed at development that will ultimately result in the ability to reliably <span class="hlt">drill</span> 'faster and deeper' possibly with smaller, more mobile rigs. The principle focus is on demonstration testing of diamond bits rotating at speeds in excess of 10,000 rpm to achieve high rate of penetration (ROP) rock cutting with substantially lower inputs of energy and loads. The significance of the 'ultra-high rotary speed <span class="hlt">drilling</span> system' is the ability to <span class="hlt">drill</span> into rock at very low weights on bit and possibly lower energy levels. The <span class="hlt">drilling</span> and <span class="hlt">coring</span> industry today does not practice this technology. The highest rotary speed systems in oil field and mining <span class="hlt">drilling</span> and <span class="hlt">coring</span> today run less than 10,000 rpm - usually well below 5,000 rpm. This document provides the progress through two phases of the program entitled 'Smaller Footprint <span class="hlt">Drilling</span> System for Deep and Hard Rock Environments: Feasibility of Ultra-High-Speed Diamond <span class="hlt">Drilling</span>' for the period starting 30 June 2003 and concluding 31 March 2009. The accomplishments of Phases 1 and 2 are summarized as follows: (1) TerraTek reviewed applicable literature and documentation and convened a project kick-off meeting with Industry Advisors in attendance (see Black and Judzis); (2) TerraTek designed and planned Phase I bench scale experiments (See Black and Judzis). Improvements were made to the loading mechanism and the rotational speed monitoring instrumentation. New <span class="hlt">drill</span> bit designs were developed to provided a more consistent product with consistent performance. A test matrix for the final <span class="hlt">core</span> bit testing program was completed; (3) TerraTek concluded small-scale cutting performance tests; (4) Analysis of Phase 1 data indicated that there is decreased specific energy as the rotational speed increases; (5) Technology transfer, as part of Phase 1, was accomplished with technical presentations to the industry (see Judzis, Boucher, McCammon, and Black); (6) TerraTek prepared a design concept for the high speed <span class="hlt">drilling</span> test stand, which was planned around the proposed high speed mud motor concept. Alternative drives for the test stand were explored; a high speed hydraulic motor concept was finally used; (7) The high speed system was modified to accommodate larger <span class="hlt">drill</span> bits than originally planned; (8) Prototype mud turbine motors and the high speed test stand were used to drive the <span class="hlt">drill</span> bits at high speed; (9) Three different rock types were used during the testing: Sierra White granite, Crab Orchard sandstone, and Colton sandstone. The <span class="hlt">drill</span> bits used included diamond impregnated bits, a polycrystalline diamond compact (PDC) bit, a thermally stable PDC (TSP) bit, and a hybrid TSP and natural diamond bit; and (10) The <span class="hlt">drill</span> bits were run at rotary speeds up to 5500 rpm and weight on bit (WOB) to 8000 lbf. During Phase 2, the ROP as measured in depth of cut per bit revolution generally increased with increased WOB. The performance was mixed with increased rotary speed, with the depth cut with the impregnated <span class="hlt">drill</span> bit generally increasing and the TSP and hybrid TSP <span class="hlt">drill</span> bits generally decreasing. The ROP in ft/hr generally increased with all bits with increased WOB and rotary speed. The mechanical specific energy generally improved (decreased) with increased WOB and was mixed with increased rotary speed.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://hdl.handle.net/2060/19900014424"><span id="translatedtitle"><span class="hlt">Core</span> sample extractor</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Akins, James; Cobb, Billy; Hart, Steve; Leaptrotte, Jeff; Milhollin, James; Pernik, Mark</p> <p>1989-01-01</p> <p>The problem of retrieving and storing <span class="hlt">core</span> samples from a hole <span class="hlt">drilled</span> on the lunar surface is addressed. The total depth of the hole in question is 50 meters with a maximum diameter of 100 millimeters. The <span class="hlt">core</span> sample itself has a diameter of 60 millimeters and will be two meters in length. It is therefore necessary to retrieve and store 25 <span class="hlt">core</span> samples per hole. The design utilizes a control system that will stop the mechanism at a certain depth, a cam-linkage system that will fracture the <span class="hlt">core</span>, and a storage system that will save and catalogue the <span class="hlt">cores</span> to be extracted. The Rod Changer and Storage Design Group will provide the necessary tooling to get into the hole as well as to the <span class="hlt">core</span>. The mechanical design for the cam-linkage system as well as the conceptual design of the storage device are described.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=ERIC&redirectUrl=http://eric.ed.gov/?q=Petrology&pg=2&id=ED265062"><span id="translatedtitle"><span class="hlt">Geophysics</span>: The Earth in Space. A Guide for High School Students.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>American Geophysical Union, Washington, DC.</p> <p></p> <p><span class="hlt">Geophysics</span> is the application of physics, chemistry, and mathematics to the problems and processes of the earth, from its innermost <span class="hlt">core</span> to its outermost environs in space. Fields within <span class="hlt">geophysics</span> include the atmospheric sciences; geodesy; geomagnetism and paleomagnetism; hydrology; oceanography; planetology; seismology; solar-planetary…</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/59685"><span id="translatedtitle">Geological and <span class="hlt">geophysical</span> evidence of structures in northwest-trending washes, Yucca Mountain, southern Nevada, and their possible significance to a nuclear waste repository in the unsaturated zone</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Scott, R.B.; Bath, G.D.; Flanigan, V.J.; Hoover, D.B.; Rosenbaum, J.G.; Spengler, R.W.</p> <p>1984-12-31</p> <p>Geological and <span class="hlt">geophysical</span> evidence suggests that five prominent linear northwest-trending washes in the northeastern part of Yucca Mountain, Nevada, are underlain by zones of right-lateral strike-slip faults. Northwest-striking faults exposed along the washes are nearly vertical, have essentially horizontal striations on slickensides, and have small vertical offsets. <span class="hlt">Cores</span> from <span class="hlt">drill</span> holes within <span class="hlt">Drill</span> Hole Wash contain northwest-striking steeply dipping fault and fracture planes. Higher conductances and lower resistivities in zones within <span class="hlt">Drill</span> Hole Wash are interpreted as zones of fractured rocks that are more highly altered or contain more water than adjacent, less fractured rocks. Little measurable horizontal offset of geomorphic features has occurred along these strike-slip faults, and strike-slip motion was probably small, even along the longest of these faults. The strikes, sense of motion, geographic position, and age of these Yucca Mountain strike-slip faults are similar to those of the regional Walker Lane-Las Vegas Valley shear zones. Strike-slip faults in the northeastern part of Yucca Mountain will affect the stability of mined openings of the potential high-level nuclear waste repository at Yucca Mountain where brecciated or highly fractured zones are encountered. Because the repository is planned above the water table in unsaturated rocks, such faults may be favorable features where they allow recharge to drain rapidly from the repository. However, at greater depths these faults may be adverse features where they provide potential hydrologic conduits through unsaturated sorptive zeolitized nonwelded tuffs below the repository and within rocks below the water table in the saturated zone. Although these potentially favorable and adverse factors must be investigated and evaluated, present information does not rule out extension of the repository into the area northeast of <span class="hlt">Drill</span> Hole Wash.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2013AGUSMGP32A..02F"><span id="translatedtitle">Paleomagnetic and Magnetostratigraphic Studies in <span class="hlt">Drilling</span> Projects of Impact Craters - Recent Studies, Challenges and Perspectives</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Fucugauchi, J. U.; Velasco-Villarreal, M.; Perez-Cruz, L. L.</p> <p>2013-05-01</p> <p>Paleomagnetic studies have long been successfully carried out in <span class="hlt">drilling</span> projects, to characterize the borehole columns and to investigate the subsurface structure and stratigraphy. Magnetic susceptibility logging and magnetostratigraphic studies provide data for lateral correlation, formation evaluation, azimuthal <span class="hlt">core</span> orientation, physical properties, etc., and are part of the tools available in the ocean and continental <span class="hlt">drilling</span> programs. The inclusion of continuous <span class="hlt">core</span> recovery in scientific <span class="hlt">drilling</span> projects have greatly expanded the range of potential applications of paleomagnetic and rock magnetic studies, by allowing laboratory measurements on <span class="hlt">core</span> samples. For this presentation, we concentrate on <span class="hlt">drilling</span> studies of impact structures and their usefulness for documenting the structure, stratigraphy and physical properties at depth. There are about 170-180 impact craters documented in the terrestrial record, which is a small number compared to what is observed in the Moon, Mars, Venus and other bodies of the solar system. Of the terrestrial impact craters, only a few have been studied by <span class="hlt">drilling</span>. Some craters have been <span class="hlt">drilled</span> as part of industry exploration surveys and/or academic projects, including notably the Sudbury, Ries, Vredefort, Manson and many other craters. As part of the Continental ICDP program, <span class="hlt">drilling</span> projects have been conducted on the Chicxulub, Bosumtwi, Chesapeake and El gygytgyn craters. <span class="hlt">Drilling</span> of terrestrial craters has proved important in documenting the shallow stratigraphy and structure, providing insight on the cratering and impact dynamics. Questions include several that can only be addressed by retrieving <span class="hlt">core</span> samples and laboratory analyses. Paleomagnetic, rock magnetic and fabric studies have been conducted in the various craters, which are here summarized with emphasis on the Chicxulub crater and Yucatan carbonate platform. Chicxulub is buried under a kilometer of younger sediments, making <span class="hlt">drilling</span> an essential tool. Oil exploration included several boreholes, and additionally we have <span class="hlt">drilled</span> 11 boreholes with continuous <span class="hlt">core</span> recovery. Contributions and limitations of paleomagnetism for investigating the impact age, crater stratigraphy, cratering, ejecta emplacement, impact dynamics, hydrothermal system and post-impact processes are discussed.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www-odp.tamu.edu/publications/155_SR/CHAP_09.PDF"><span id="translatedtitle">Flood, R.D., Piper, D.J.W., Klaus, A., and Peterson, L.C. (Eds.), 1997 Proceedings of the Ocean <span class="hlt">Drilling</span> Program, Scientific Results, Vol. 155</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p><span class="hlt">Drilling</span> Program, Scientific Results, Vol. 155 177 9. CLAY MINERAL DISTRIBUTION AND SIGNIFICANCE from 16 Ocean <span class="hlt">Drilling</span> Program Leg 155 sites and were placed in lithologic successions to study, until recently, rath- er poorly defined because of the lack of <span class="hlt">drilling</span> <span class="hlt">cores</span>. Leg 155 of the Ocean</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www-odp.tamu.edu/publications/155_SR/CHAP_04.PDF"><span id="translatedtitle">Flood, R.D., Piper, D.J.W., Klaus, A., and Peterson, L.C. (Eds.), 1997 Proceedings of the Ocean <span class="hlt">Drilling</span> Program, Scientific Results, Vol. 155</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p><span class="hlt">Drilling</span> Program, Scientific Results, Vol. 155 53 4. TURBIDITY-CURRENT OVERSPILL FROM THE AMAZON CHANNEL <span class="hlt">Drilling</span> Program (ODP) Leg 155, six sites were <span class="hlt">drilled</span> into the levees of the Amazon Channel (Fig. 1). The Leg 155 <span class="hlt">cores</span> provide samples through the levees of a major deep-sea channel at several locations</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2005AGUFM.T51A1332O"><span id="translatedtitle">Subsurface Resistivity Structures in and Around Strike-Slip Faults - Electromagnetic Surveys and <span class="hlt">Drillings</span> Across Active Faults in Central Japan -</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Omura, K.; Ikeda, R.; Iio, Y.; Matsuda, T.</p> <p>2005-12-01</p> <p>Electrical resistivity is important property to investigate the structure of active faults. Pore fluid affect seriously the electrical properties of rocks, subsurface electrical resistivity can be an indicator of the existence of fluid and distribution of pores. Fracture zone of fault is expected to have low resistivity due to high porosity and small gain size. Especially, strike-slip type fault has nearly vertical fracture zone and the fracture zone would be detected by an electrical survey across the fault. We performed electromagnetic survey across the strike-slip active faults in central Japan. At the same faults, we also <span class="hlt">drilled</span> borehole into the fault and did downhole logging in the borehole. We applied MT or CSAMT methods onto 5 faults: Nojima fault which appeared on the surface by the 1995 Great Kobe earthquake (M=7.2), western Nagano Ohtaki area(1984 Nagano-ken seibu earthquake (M=6.8), the fault did not appeared on the surface), Neodani fault which appeared by the 1891 Nobi earthquake (M=8.0), Atera fault which seemed to be dislocated by the 1586 Tensyo earthquake (M=7.9), Gofukuji fault that is considered to have activated about 1200 years ago. The sampling frequencies of electrical and magnetic field were 2 - 1024Hz (10 frequencies) for CSAMT survey and 0.00055 - 384Hz (40 frequencies) for MT survey. The electromagnetic data were processed by standard method and inverted to 2-D resistivity structure along transects of the faults. Results of the survey were compared with downhole electrical logging data and observational descriptions of <span class="hlt">drilled</span> <span class="hlt">cores</span>. Fault plane of each fault were recognized as low resistivity region or boundary between relatively low and high resistivity region, except for Gofukuji fault. As for Gofukuji fault, fault was located in relatively high resistivity region. During very long elapsed time from the last earthquake, the properties of fracture zone of Gofukuji fault might changed from low resistivity properties as observed for other faults. Downhole electrical logging data were consistent to values of resistivity estimated by electromagnetic survey for each fault. The existence of relatively low and high resistivity regions in 2-D structure from electromagnetic survey was observed again by downhole logging at the correspondent portion in the borehole. <span class="hlt">Cores</span> recovered from depthes where the electrical logging showed low resistivity were hardly fractured and altered from host rock which showed high resistivity. Results of electromagnetic survey, downhole electrical logging and observation of <span class="hlt">drilled</span> <span class="hlt">cores</span> were consistent to each other. In present case, electromagnetic survey is useful to explore the properties of fault fracture zone. In the further investigations, it is important to explore relationships among features of resistivity structure and geological and <span class="hlt">geophysical</span> situations of the faults.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/61392402"><span id="translatedtitle">Influence of chemical treatment on the life of <span class="hlt">drill</span> bits</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>S. I. Kantor; I. M. Nimets</p> <p>1983-01-01</p> <p>The quality of treatment of the bearing lug of a <span class="hlt">drill</span> bit is most important in the life of a bit. Depth of carburized case, surface hardness of bearing path and shoulders, microstructure of the case, and mechanical properties of the <span class="hlt">core</span> all determine the quality of the treatment. Optimum carbon content, mechanical properties, and influence of the carburized case</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2015EGUGA..17.3134C"><span id="translatedtitle">The Hominin Sites and Paleolakes <span class="hlt">Drilling</span> Project (HSPDP): Understanding the paleoenvironmental and paleoclimatic context of human origins through continental <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Cohen, Andrew S.; Campisano, Christopher; Asrat, Asfawossen; Arrowsmith, Ramon; Deino, Alan; Feibel, Craig; Hill, Andrew; Kingston, John; Lamb, Henry; Lowenstein, Tim; Olago, Daniel; Bernhart Owen, R.; Renaut, Robin; Schabitz, Frank; Trauth, Martin</p> <p>2015-04-01</p> <p>The influence of climate and environmental history on human evolution is an existential question that continues to be hotly debated, in part because of the paucity of high resolution records collected in close proximity to the key fossil and archaeological evidence. To address this issue and transform the scientific debate, the HSPDP was developed to collect lacustrine sediment <span class="hlt">drill</span> <span class="hlt">cores</span> from basins in Kenya and Ethiopia that collectively encompass critical time intervals and locations for Plio-Quaternary human evolution in East Africa. After a 17 month campaign, <span class="hlt">drilling</span> was completed in November, 2014, with over 1750m of <span class="hlt">core</span> collected from 11 boreholes from five areas (1930m total <span class="hlt">drilling</span> length, avg. 91% recovery). The sites, from oldest to youngest, include 1) N. Awash, Ethiopia (~3.5-2.9Ma <span class="hlt">core</span> interval); 2) Baringo-Tugen Hills, Kenya (~3.3-2.5Ma); 3) West Turkana, Kenya (~1.9-1.4Ma); L. Magadi, Kenya (0.8-0Ma) and the Chew Bahir Basin, Ethiopia (~0.5-0Ma). Initial <span class="hlt">core</span> description (ICD) and sampling for geochronology, geochemistry and paleoecology studies had been completed by mid2014, with the two remaining sites (Magadi and Chew Bahir) scheduled for ICD work in early 2015. Whereas the primary scientific targets were the lacustrine deposits from the hominin-bearing basin depocenters, many intervals of paleosols (representative of low lake stands and probable arid periods) were also encountered in <span class="hlt">drill</span> <span class="hlt">cores</span>. Preliminary analyses of <span class="hlt">drill</span> <span class="hlt">core</span> sedimentology and geochemistry show both long-term lake level changes and cyclic variability in lake levels, both of which may be indicative of climatic forcing events of interest to paleoanthropologists. Authors of this abstract also include the entire HSPDP field team.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5800064"><span id="translatedtitle">Horizontal <span class="hlt">drilling</span> spurs optimism</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Crouse, P.C. (Philip C. Crouse and Associates, Inc., Horizontal Advisors Unit, Dallas, TX (US))</p> <p>1991-02-01</p> <p>1990 proved to be an exciting year for horizontal wells. This budding procedure appears to be heading for the mainstream oil and gas market, because it can more efficiently recover hydrocarbons from many reservoirs throughout the world. This paper reports on an estimated 1,000 wells that were <span class="hlt">drilled</span> horizontally (all laterals) in 1990, with the Austin Chalk formation of Texas accounting for about 65% of all world activity. The Bakken Shale play in Montana and North Dakota proved to be the second most active area, with an estimated 90 wells <span class="hlt">drilled</span>. Many operators in this play have indicated the bloom may be off the Bakken because of poor results outside the nose of the formation, further complicated by some of the harshest rock, reservoir and completion problems posed to horizontal technology.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5692267"><span id="translatedtitle">Analysis of infill <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Gould, T.L.; Munoz, M.A.</p> <p>1982-01-01</p> <p>This study analyzes the effect of reservoir and fluid properties on infill performance and determines the conditions under which infilling is economically justified. Waterflood stimulations were performed on single- and multi-layer 5-spot symmetry elements. Infilling was performed at several water cuts in order to evaluate the effect of initial saturation distribution on oil rate decline characteristics. Infill decline characteristics and cut-cum analysis were compared with continuation of the existing waterflood to the economic limit. It has been shown that infill <span class="hlt">drilling</span> performance is sensitive to water cut at infill, oil viscosity, heterogeneity, and the degree of cross-flow between layers. The results of this work can be used to estimate the amount of incremental secondary oil that will result from infill <span class="hlt">drilling</span> an ongoing pattern waterflood. 13 references.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/7021011"><span id="translatedtitle"><span class="hlt">Drilling</span> fluid disposal</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Nesbitt, L.E.; Sanders, J.A.</p> <p>1981-12-01</p> <p>A maze of U.S. regulations and regulatory agencies coupled with uncertainty in interpretation of environmental data and an evolving system of disposal engineering will require industry action to monitor the area and derive a solid engineering basis for disposal of spent <span class="hlt">drilling</span> fluid. A set of disposal methods with approximate costs is presented to serve as an initial guide for disposal. 16 refs.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NSDL&redirectUrl=http://www.agu.org/"><span id="translatedtitle">American <span class="hlt">Geophysical</span> Union</span></a></p> <p><a target="_blank" href="http://nsdl.org/nsdl_dds/services/ddsws1-1/service_explorer.jsp">NSDL National Science Digital Library</a></p> <p></p> <p></p> <p>The American <span class="hlt">Geophysical</span> Union (AGU), which was established in 1919 by the National Research Council and for more than 50 years operated as an unincorporated affiliate of the National Academy of Sciences, is now a nonprofit corporation chartered under the laws of the District of Columbia. The Union is dedicated to the furtherance of the <span class="hlt">geophysical</span> sciences through the individual efforts of its members and in cooperation with other national and international scientific organizations.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/372366"><span id="translatedtitle">Measuring skin while <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Engler, T.W.; Osisanya, S.; Tiab, D.</p> <p>1995-12-31</p> <p>A new model is proposed to characterize the variation in skin effect along a horizontal well. Typically, a cylindrical-shaped damaged region is assumed; however, this work describes the damaged region as a combination cylindrical-conical shape. The shape of the damaged region and the severity of the damage is governed by the contact time of the <span class="hlt">drilling</span> fluid with the formation. This time is a function of the <span class="hlt">drilling</span> rate penetration (ROP) and the mud filtrate invasion rate. Simple, empirical models are used to provide ROP and mud filtrate invasion rate. The effects of anisotropy ratio, penetration rates, and horizontal length are included in the analysis. Anisotropy and increasing penetration rate both will result in a decrease in the skin effect. Any horizontal well length greater than the equivalent horizontal length of the cone-shaped damage region will result in a constant cylindrical-shaped damage region, which can be evaluated using Hawkins` formula. The cone-shaped damage region will exist at the furthest end of the horizontal length. The time to transform the cone-shaped damage region to a cylinder is the circulation time after <span class="hlt">drilling</span> to the total length. This circulation time is determined for the various anisotropy ratios and penetration rates.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/886132"><span id="translatedtitle"><span class="hlt">Drill</span> Pipe Corrosion Control Using an Inert <span class="hlt">Drilling</span> Fluid</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Caskey, B. C.; Copass, K. S.</p> <p>1981-01-01</p> <p>The results of a geothermal <span class="hlt">drill</span> pipe corrosion field test are presented. When a low-density <span class="hlt">drilling</span> fluid was required for <span class="hlt">drilling</span> a geothermal well because of an underpressured, fractured formation, two <span class="hlt">drilling</span> fluids were alternately used to compare <span class="hlt">drill</span> pipe corrosion rates. The first fluid was an air-water mist with corrosion control chemicals. The other fluid was a nitrogen-water mist without added chemicals. The test was conducted during November 1980 at the Baca location in northern New Mexico. Data from corrosion rings, corrosion probes, fluid samples and flow line instrumentation are plotted for the ten day test period. it is shown that the inert <span class="hlt">drilling</span> fluid, nitrogen, reduced corrosion rates by more than an order of magnitude. Test setup and procedures are also discussed.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/5253866"><span id="translatedtitle">Measurement-while-<span class="hlt">drilling</span> (MWD) development for air <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Rubin, L.A.; Harrison, W.H.</p> <p>1992-01-01</p> <p>The objective of this program is to tool-harden and make commercially available an existing wireless MWD tool to reliably operate in an air, air-mist, or air-foam environment during Appalachian Basin oil and gas directional <span class="hlt">drilling</span> operations in conjunction with downhole motors and/or (other) bottom-hole assemblies. The application of this technology is required for <span class="hlt">drilling</span> high angle (holes) and horizontal well <span class="hlt">drilling</span> in low-pressure, water sensitive, tight gas formations that require air, air-mist, and foam <span class="hlt">drilling</span> fluids. The basic approach to accomplishing this objective was to modify GEC's existing electromagnetic (e-m) CABLELESS''{trademark} MWD tool to improve its reliability in air <span class="hlt">drilling</span> by increasing its tolerance to higher vibration and shock levels (hardening). Another important aim of the program is to provide for continuing availability of the resultant tool for use on DOE-sponsored, and other, air-<span class="hlt">drilling</span> programs.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/10149522"><span id="translatedtitle">Measurement-while-<span class="hlt">drilling</span> (MWD) development for air <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Rubin, L.A.; Harrison, W.H.</p> <p>1992-06-01</p> <p>The objective of this program is to tool-harden and make commercially available an existing wireless MWD tool to reliably operate in an air, air-mist, or air-foam environment during Appalachian Basin oil and gas directional <span class="hlt">drilling</span> operations in conjunction with downhole motors and/or (other) bottom-hole assemblies. The application of this technology is required for <span class="hlt">drilling</span> high angle (holes) and horizontal well <span class="hlt">drilling</span> in low-pressure, water sensitive, tight gas formations that require air, air-mist, and foam <span class="hlt">drilling</span> fluids. The basic approach to accomplishing this objective was to modify GEC`s existing electromagnetic (e-m) ``CABLELESS``{trademark} MWD tool to improve its reliability in air <span class="hlt">drilling</span> by increasing its tolerance to higher vibration and shock levels (hardening). Another important aim of the program is to provide for continuing availability of the resultant tool for use on DOE-sponsored, and other, air-<span class="hlt">drilling</span> programs.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/879175"><span id="translatedtitle">Smaller Footprint <span class="hlt">Drilling</span> System for Deep and Hard Rock Environments; Feasibility of Ultra-High-Speed Diamond <span class="hlt">Drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Arnis Judzis; Alan Black; Homer Robertson</p> <p>2006-03-01</p> <p>The two phase program addresses long-term developments in deep well and hard rock <span class="hlt">drilling</span>. TerraTek believes that significant improvements in <span class="hlt">drilling</span> deep hard rock will be obtained by applying ultra-high rotational speeds (greater than 10,000 rpm). The work includes a feasibility of concept research effort aimed at development that will ultimately result in the ability to reliably <span class="hlt">drill</span> ''faster and deeper'' possibly with smaller, more mobile rigs. The principle focus is on demonstration testing of diamond bits rotating at speeds in excess of 10,000 rpm to achieve high rate of penetration (ROP) rock cutting with substantially lower inputs of energy and loads. The significance of the ultra-high rotary speed <span class="hlt">drilling</span> system is the ability to <span class="hlt">drill</span> into rock at very low weights on bit and possibly lower energy levels. The <span class="hlt">drilling</span> and <span class="hlt">coring</span> industry today does not practice this technology. The highest rotary speed systems in oil field and mining <span class="hlt">drilling</span> and <span class="hlt">coring</span> today run less than 10,000 rpm--usually well below 5,000 rpm. This document details the progress to date on the program entitled ''Smaller Footprint <span class="hlt">Drilling</span> System for Deep and Hard Rock Environments: Feasibility of Ultra-High-Speed Diamond <span class="hlt">Drilling</span>'' for the period starting 1 October 2004 through 30 September 2005. Additionally, research activity from 1 October 2005 through 28 February 2006 is included in this report: (1) TerraTek reviewed applicable literature and documentation and convened a project kick-off meeting with Industry Advisors in attendance. (2) TerraTek designed and planned Phase I bench scale experiments. Some difficulties continue in obtaining ultra-high speed motors. Improvements have been made to the loading mechanism and the rotational speed monitoring instrumentation. New <span class="hlt">drill</span> bit designs have been provided to vendors for production. A more consistent product is required to minimize the differences in bit performance. A test matrix for the final <span class="hlt">core</span> bit testing program has been completed. (3) TerraTek is progressing through Task 3 ''Small-scale cutting performance tests''. (4) Significant testing has been performed on nine different rocks. (5) Bit balling has been observed on some rock and seems to be more pronounces at higher rotational speeds. (6) Preliminary analysis of data has been completed and indicates that decreased specific energy is required as the rotational speed increases (Task 4). This data analysis has been used to direct the efforts of the final testing for Phase I (Task 5). (7) Technology transfer (Task 6) has begun with technical presentations to the industry (see Judzis).</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2002AGUFMPP21B0330C"><span id="translatedtitle">Precision Positioning for Shallow Water <span class="hlt">Drilling</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chayes, D. N.; Schmidt, V. E.</p> <p>2002-12-01</p> <p>The science-driven requirement for sediment <span class="hlt">cores</span> on continental shelves has led to the Active Heave Compensation (AHC) upgrade Global LAke <span class="hlt">Drilling</span> (GLAD)-800 <span class="hlt">drilling</span> system. The AHC-GLAD800 <span class="hlt">drill</span> rig was developed for installation on the largest vessels in the UNOLS fleet and was tested in the November 2001 on the R/V Knorr. Evaluation of the results of that test cruise pointed out the need for a significant increase in the accuracy and repeatability of the real-time navigation input to the vessel?s dynamic positioning (DP) system. An shore-based evaluation of different Global Positioning System (GPS) receivers including P-Code, US Coast Guard broadcast differential GPS (DGPS) and commercial satellite distributed DGPS was used to develop an approach for real-time system that flags and excludes outliers in order to maintain the tight input requirements for the DP system. Analysis of the data collected from the shore-based experiments and the at-sea field program will be presented.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li class="active"><span>23</span></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_23 --> <div id="page_24" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li class="active"><span>24</span></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="461"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6079546"><span id="translatedtitle">Effect of <span class="hlt">drilling</span> fluids on permeability of uranium sandstone</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Ahlness, J.K.; Johnson, D.I.; Tweeton, D.R.</p> <p>1984-01-01</p> <p>The Bureau of Mines conducted laboratory and field experiments to determine the amount of permeability reduction in uranium sandstone after its exposure to different <span class="hlt">drilling</span> fluids. Seven polymer and two bentonite fluids were laboratory-tested in their clean condition, and six polymer fluids were tested with simulated <span class="hlt">drill</span> cuttings added. Sandstone <span class="hlt">cores</span> cut from samples collected at an open pit uranium mine were the test medium. The clean fluid that resulted in the least permeability reduction was an hydroxyethyl cellulose polymer fluid. The greatest permeability reduction of the clean polymers came from a shale-inhibiting synthetic polymer. Six polymer fluids were tested with simulated <span class="hlt">drill</span> cuttings added to represent field use. The least permeability reduction was obtained from a multipolymer blend fluid. A field experiment was performed to compare how two polymer fluids affect formation permeability when used for <span class="hlt">drilling</span> in situ uranium leaching wells. For this test, the polymer fluid with the best laboratory results (multipolymer blend) was compared with a commonly used polymer fluid (guar gum) that gave poorer laboratory results. When fluid injection rates for the four wells <span class="hlt">drilled</span> with the guar gum were compared with those for the four <span class="hlt">drilled</span> with the multipolymer blend, no statistically significant difference was found.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/913141"><span id="translatedtitle">Apparatus in a <span class="hlt">drill</span> string</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Hall, David R. (Provo, UT); Dahlgren, Scott (Alpine, UT); Hall, Jr., Tracy H. (Provo, UT); Fox, Joe (Lehi, UT); Pixton, David S. (Provo, UT)</p> <p>2007-07-17</p> <p>An apparatus in a <span class="hlt">drill</span> string comprises an internally upset <span class="hlt">drill</span> pipe. The <span class="hlt">drill</span> pipe comprises a first end, a second end, and an elongate tube intermediate the first and second ends. The elongate tube and the ends comprising a continuous an inside surface with a plurality of diameters. A conformable spirally welded metal tube is disposed within the <span class="hlt">drill</span> pipe intermediate the ends thereof and terminating adjacent to the ends of the <span class="hlt">drill</span> pipe. The conformable metal tube substantially conforms to the continuous inside surface of the metal tube. The metal tube may comprise a non-uniform section which is expanded to conform to the inside surface of the <span class="hlt">drill</span> pipe. The non-uniform section may comprise protrusions selected from the group consisting of convolutions, corrugations, flutes, and dimples. The non-uniform section extends generally longitudinally along the length of the tube.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2015EGUGA..17.4419S"><span id="translatedtitle">Arctic Ocean Paleoceanography and Future IODP <span class="hlt">Drilling</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Stein, Ruediger</p> <p>2015-04-01</p> <p>Although the Arctic Ocean is a major player in the global climate/earth system, this region is one of the last major physiographic provinces on Earth where the short- and long-term geological history is still poorly known. This lack in knowledge is mainly due to the major technological/logistical problems in operating within the permanently ice-covered Arctic region which makes it difficult to retrieve long and undisturbed sediment <span class="hlt">cores</span>. Prior to 2004, in the central Arctic Ocean piston and gravity <span class="hlt">coring</span> was mainly restricted to obtaining near-surface sediments, i.e., only the upper 15 m could be sampled. Thus, all studies were restricted to the late Pliocene/Quaternary time interval, with a few exceptions. These include the four short <span class="hlt">cores</span> obtained by gravity <span class="hlt">coring</span> from drifting ice floes over the Alpha Ridge, where older pre-Neogene organic-carbon-rich muds and laminated biosiliceous oozes were sampled. Continuous central Arctic Ocean sedimentary records, allowing a development of chronologic sequences of climate and environmental change through Cenozoic times and a comparison with global climate records, however, were missing prior to the IODP Expedition 302 (Arctic Ocean <span class="hlt">Coring</span> Expedition - ACEX), the first scientific <span class="hlt">drilling</span> in the central Arctic Ocean. By studying the unique ACEX sequence, a large number of scientific discoveries that describe previously unknown Arctic paleoenvironments, were obtained during the last decade (for most recent review and references see Stein et al., 2014). While these results from ACEX were unprecedented, key questions related to the climate history of the Arctic Ocean remain unanswered, in part because of poor <span class="hlt">core</span> recovery, and in part because of the possible presence of a major mid-Cenozoic hiatus or interval of starved sedimentation within the ACEX record. In order to fill this gap in knowledge, international, multidisciplinary expeditions and projects for scientific <span class="hlt">drilling/coring</span> in the Arctic Ocean are needed. Key areas and approaches for <span class="hlt">drilling</span> and recovering undisturbed and complete sedimentary sequences are depth transects across the major ocean ridge systems, such as the Lomonosov Ridge. These new detailed climate records spanning time intervals from the (late Cretaceous/)Paleogene Greenhouse world to the Neogene-Quaternary Icehouse world will give new insights into our understanding of the Arctic Ocean within the global climate system and provide an opportunity to test the performance of climate models used to predict future climate change. During the Polarstern Expedition PS87 in August-September 2014, new site survey data including detailed multibeam bathymetry, multi-channel seismic and Parasound profiling as well as geological <span class="hlt">coring</span>, were obtained on Lomonosov Ridge (Stein, 2015), being the basis for a more precise planning and update for a future IODP <span class="hlt">drilling</span> campaign. Reference: Stein, R. (Ed.), 2015. Cruise Report of Polarstern Expedition PS87-2014 (Arctic Ocean/Lomonosov Ridge). Reps. Pol. Mar. Res., in press. Stein, R. , Weller, P. , Backman, J. , Brinkhuis, H., Moran, K. , Pälike, H., 2014. Cenozoic Arctic Ocean Climate History: Some highlights from the IODP Arctic <span class="hlt">Coring</span> Expedition (ACEX). Developments in Marine Geology 7, Elsevier Amsterdam/New York, pp. 259-293.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2009AGUFM.P43A1423Z"><span id="translatedtitle">Mars and Lunar Vacuum Chamber Testing Facilities and Vacuum Rated <span class="hlt">Drill</span> Systems</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zacny, K.; Paulsen, G.; Craft, J.; Maksymuk, M.; Santoro, C.; Wilson, J.</p> <p>2009-12-01</p> <p>Martian and Lunar low pressure and vacuum conditions, respectively, greatly affect the performance of the <span class="hlt">drilling</span> mechanics and <span class="hlt">drill</span> hardware. For this reason, it is imperative to test planetary sampling and <span class="hlt">coring</span> <span class="hlt">drills</span> under these specific environments. Honeybee Robotics acquired an 11ft vacuum chamber that is currently being used to test <span class="hlt">drills</span> to 1m depth and more. A separate cooling system is used to maintain low temperature of planetary analog formations such as ice, soil, icy-soils, and rocks. The low temperature increases the strength of these formations and in turn reduces <span class="hlt">drilling</span> efficiency. The chamber also has a numerous feed troughs that can be used to transfer thermal data from thermocouples embedded inside the <span class="hlt">drilled</span> sample, and the <span class="hlt">drill</span> bits. The thermal data is useful to determine the temperature the sample reaches during the <span class="hlt">drilling</span> process. The <span class="hlt">drill</span> systems include rotary, rotary-percussive, and rotary-sonic. The latter two, in particular, offer superior performance in hard formations due to impacts and/or vibrations that enhance penetration rate. All the <span class="hlt">drill</span> systems are vacuum rated and hence can be used as test platforms for vacuum testing.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/839170"><span id="translatedtitle">SMALLER FOOTPRINT <span class="hlt">DRILLING</span> SYSTEM FOR DEEP AND HARD ROCK ENVIRONMENTS; FEASIBILITY OF ULTRA-HIGH SPEED DIAMOND <span class="hlt">DRILLING</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Alan Black; Arnis Judzis</p> <p>2004-10-01</p> <p>The two phase program addresses long-term developments in deep well and hard rock <span class="hlt">drilling</span>. TerraTek believes that significant improvements in <span class="hlt">drilling</span> deep hard rock will be obtained by applying ultra-high (greater than 10,000 rpm) rotational speeds. The work includes a feasibility of concept research effort aimed at development and test results that will ultimately result in the ability to reliably <span class="hlt">drill</span> ''faster and deeper'' possibly with rigs having a smaller footprint to be more mobile. The principle focus is on demonstration testing of diamond bits rotating at speeds in excess of 10,000 rpm to achieve high rate of penetration rock cutting with substantially lower inputs of energy and loads. The project draws on TerraTek results submitted to NASA's ''<span class="hlt">Drilling</span> on Mars'' program. The objective of that program was to demonstrate miniaturization of a robust and mobile <span class="hlt">drilling</span> system that expends small amounts of energy. TerraTek successfully tested ultrahigh speed ({approx}40,000 rpm) small kerf diamond <span class="hlt">coring</span>. Adaptation to the oilfield will require innovative bit designs for full hole <span class="hlt">drilling</span> or continuous <span class="hlt">coring</span> and the eventual development of downhole ultra-high speed drives. For domestic operations involving hard rock and deep oil and gas plays, improvements in penetration rates is an opportunity to reduce well costs and make viable certain field developments. An estimate of North American hard rock <span class="hlt">drilling</span> costs is in excess of $1,200 MM. Thus potential savings of $200 MM to $600 MM are possible if <span class="hlt">drilling</span> rates are doubled [assuming bit life is reasonable]. The net result for operators is improved profit margin as well as an improved position on reserves. The significance of the ''ultra-high rotary speed <span class="hlt">drilling</span> system'' is the ability to <span class="hlt">drill</span> into rock at very low weights on bit and possibly lower energy levels. The <span class="hlt">drilling</span> and <span class="hlt">coring</span> industry today does not practice this technology. The highest rotary speed systems in oil field and mining <span class="hlt">drilling</span> and <span class="hlt">coring</span> today run less than 10,000 rpm--usually well below 5,000 rpm. This document details the progress to date on the program entitled ''SMALLER FOOTPRINT <span class="hlt">DRILLING</span> SYSTEM FOR DEEP AND HARD ROCK ENVIRONMENTS; FEASIBILITY OF ULTRA-HIGH SPEED DIAMOND <span class="hlt">DRILLING</span>'' for the period starting June 23, 2003 through September 30, 2004. TerraTek has reviewed applicable literature and documentation and has convened a project kick-off meeting with Industry Advisors in attendance. TerraTek has designed and planned Phase I bench scale experiments. Some difficulties in obtaining ultra-high speed motors for this feasibility work were encountered though they were sourced mid 2004. TerraTek is progressing through Task 3 ''Small-scale cutting performance tests''. Some improvements over early NASA experiments have been identified.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/835941"><span id="translatedtitle">SMALLER FOOTPRINT <span class="hlt">DRILLING</span> SYSTEM FOR DEEP AND HARD ROCK ENVIRONMENTS; FEASIBILITY OF ULTRA-HIGH SPEED DIAMOND <span class="hlt">DRILLING</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Alan Black; Arnis Judzis</p> <p>2004-10-01</p> <p>The two phase program addresses long-term developments in deep well and hard rock <span class="hlt">drilling</span>. TerraTek believes that significant improvements in <span class="hlt">drilling</span> deep hard rock will be obtained by applying ultra-high (greater than 10,000 rpm) rotational speeds. The work includes a feasibility of concept research effort aimed at development and test results that will ultimately result in the ability to reliably <span class="hlt">drill</span> ''faster and deeper'' possibly with rigs having a smaller footprint to be more mobile. The principle focus is on demonstration testing of diamond bits rotating at speeds in excess of 10,000 rpm to achieve high rate of penetration rock cutting with substantially lower inputs of energy and loads. The project draws on TerraTek results submitted to NASA's ''<span class="hlt">Drilling</span> on Mars'' program. The objective of that program was to demonstrate miniaturization of a robust and mobile <span class="hlt">drilling</span> system that expends small amounts of energy. TerraTek successfully tested ultrahigh speed ({approx}40,000 rpm) small kerf diamond <span class="hlt">coring</span>. Adaptation to the oilfield will require innovative bit designs for full hole <span class="hlt">drilling</span> or continuous <span class="hlt">coring</span> and the eventual development of downhole ultra-high speed drives. For domestic operations involving hard rock and deep oil and gas plays, improvements in penetration rates is an opportunity to reduce well costs and make viable certain field developments. An estimate of North American hard rock <span class="hlt">drilling</span> costs is in excess of $1,200 MM. Thus potential savings of $200 MM to $600 MM are possible if <span class="hlt">drilling</span> rates are doubled [assuming bit life is reasonable]. The net result for operators is improved profit margin as well as an improved position on reserves. The significance of the ''ultra-high rotary speed <span class="hlt">drilling</span> system'' is the ability to <span class="hlt">drill</span> into rock at very low weights on bit and possibly lower energy levels. The <span class="hlt">drilling</span> and <span class="hlt">coring</span> industry today does not practice this technology. The highest rotary speed systems in oil field and mining <span class="hlt">drilling</span> and <span class="hlt">coring</span> today run less than 10,000 rpm--usually well below 5,000 rpm. This document details the progress to date on the program entitled ''SMALLER FOOTPRINT <span class="hlt">DRILLING</span> SYSTEM FOR DEEP AND HARD ROCK ENVIRONMENTS; FEASIBILITY OF ULTRA-HIGH SPEED DIAMOND <span class="hlt">DRILLING</span>'' for the period starting June 23, 2003 through September 30, 2004. (1) TerraTek has reviewed applicable literature and documentation and has convened a project kick-off meeting with Industry Advisors in attendance. (2) TerraTek has designed and planned Phase I bench scale experiments. Some difficulties in obtaining ultra-high speed motors for this feasibility work were encountered though they were sourced mid 2004. (3) TerraTek is progressing through Task 3 ''Small-scale cutting performance tests''. Some improvements over early NASA experiments have been identified.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6998253"><span id="translatedtitle">MWD aids vital <span class="hlt">drilling</span> decisions</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Fontenot, J.E.; Rao, M.V.</p> <p>1988-03-14</p> <p>Measurement-While-<span class="hlt">Drilling</span> (MWD) sensors can supply much of the critical downhole information needed in a systems approach to improving <span class="hlt">drilling</span> efficiency. The author looks at some areas where MWD information has helped to improve <span class="hlt">drilling</span> efficiency. To date, most use of MWD has been for directional survey, pressure prediction, and formation evaluation. As MWD systems become more reliable and cost effective, their applications will expand.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/19374697"><span id="translatedtitle">Attenuation of sound waves in <span class="hlt">drill</span> strings</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Douglas S. Drumheller</p> <p>1993-01-01</p> <p>During <span class="hlt">drilling</span> of deep wells, digital data are often transmitted from sensors located near the <span class="hlt">drill</span> bit to the surface. Development of a new communication system with increased data capacity is of paramount importance to the <span class="hlt">drilling</span> industry. Since steel <span class="hlt">drill</span> strings are used, transmission of these data by elastic carrier waves traveling within the <span class="hlt">drill</span> pipe is possible, but</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/61385572"><span id="translatedtitle">Axial flow turbine <span class="hlt">drill</span> for earth boring</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p></p> <p>1971-01-01</p> <p>A downhole axial flow turbine to rotate the <span class="hlt">drilling</span> bit in earth boring is described. The turbine is actuated by <span class="hlt">drilling</span> fluid flow. The turbine operates in conjunction with dual-tube <span class="hlt">drill</span> pipe. The <span class="hlt">drilling</span> fluid flows downward in the annulus of the dual-tube <span class="hlt">drill</span> pipe, through the annulus of the turbine, actuating the turbine, through the bit, ascending through the</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/61308042"><span id="translatedtitle">How to <span class="hlt">drill</span> horizontal sections faster</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>Chaffin</p> <p>1991-01-01</p> <p>This paper reports that fewer trips, reduced slide time and lower drag during sliding have resulted from the application of downhole-adjustable stabilizers to horizontal <span class="hlt">drilling</span>. Faster <span class="hlt">drilling</span> times mean lower measurement while <span class="hlt">drilling</span> (MWD) cost, and less wear on downhole equipment, motors and bits. These advantages combined with reduced <span class="hlt">drilling</span> shocks have increased <span class="hlt">drilling</span> rates and efficiency. Applying existing technology</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://www-odp.tamu.edu/publications/prelim/109PREL.PDF"><span id="translatedtitle">OCEAN <span class="hlt">DRILLING</span> PROGRAM LEG 109 PRELIMINARY REPORT</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>OCEAN <span class="hlt">DRILLING</span> PROGRAM LEG 109 PRELIMINARY REPORT BARE ROCK <span class="hlt">DRILLING</span> IN THE MID-ATLANTIC RIDGE RIFT 109 Ocean <span class="hlt">Drilling</span> Program Texas A & M University College Station, TX 77843-3469 Philip D. Rabinowitz Director Ocean <span class="hlt">Drilling</span> Program Robert B. Kidd Manager of Science Operations Ocean <span class="hlt">Drilling</span> Program Louis E</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/5921023"><span id="translatedtitle">Apparatus for washing <span class="hlt">drill</span> cuttings</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lott, W. G.</p> <p>1985-10-15</p> <p>An apparatus for cleansing a stream of <span class="hlt">drilling</span> fluid fouled <span class="hlt">drill</span> cuttings having a housing divided into a plurality of compartments each designed to retain cleansing fluid. A spinning force is imparted into the incoming fouled <span class="hlt">drill</span> cuttings in an inlet chamber wherein cleansing fluid is intimately mixed with the fouled <span class="hlt">drill</span> cuttings. A decanting chamber removes liberated <span class="hlt">drilling</span> fluid from the cuttings and disposes of such <span class="hlt">drilling</span> fluid from the apparatus via a drain trough assembly. The underflow from the decanter is passed through a solids concentrating assembly wherein the coarse solids are deposited in a concentrating assembly bottoms chamber wherein the settled <span class="hlt">drill</span> cuttings are removed from the apparatus. The overhead stream from the solids concentrating assembly is driected to a second decanter for removal of any remaining <span class="hlt">drilling</span> fluid and fine <span class="hlt">drill</span> cuttings entrained therein from the apparatus via the drain trough assembly. The remaining fluid in the concentrating assembly bottoms chamber is recirculated to the second decanting chamber and the inlet chamber.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/7017495"><span id="translatedtitle">Liner and <span class="hlt">drill</span> pipe assembly</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Lindsey, H.E.; Cole, P.W.</p> <p>1990-02-06</p> <p>This patent describes a method of cementing a linear in a well bore. It comprises: making up sections of pipe to form a liner disposed in a well bore to a desired length of liner, supporting the desired length of liner at the earth's surface while making up sections of <span class="hlt">drill</span> pipe to form a desired string of <span class="hlt">drill</span> pip co-axially disposed within the desired length of liner where the desired string of <span class="hlt">drill</span> pipe has a polished mandrel and a sealing bore receptacle at its lower end when the polished mandrel is in position for sealing reception in the sealing bore receptacle, attaching a setting tool assembly to the desired string of <span class="hlt">drill</span> pipe and attaching a liner hanger assembly with liner hanger slips to the desired length of liner; releasing the liner at the earth's surface and making up a supporting string of <span class="hlt">drill</span> pipe attached to the setting tool assembly for lowering the co-axially disposed (telescoped) desired length of liner and string of <span class="hlt">drill</span> pipe through the well bore hanging the liner in the well bore with liner hanger slips; pumping a volume of cement slurry through the supporting string of <span class="hlt">drill</span> pipe; and upon the trailing end of the volume of cement slurry reaching the lower end of the desired string of <span class="hlt">drill</span> pipe, opening the interior of the desired string of <span class="hlt">drill</span> pipe to the interior of the liner at a location above the sealing bore receptacle.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://ntrs.nasa.gov/search.jsp?R=19900014420&hterms=downhole&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Ddownhole"><span id="translatedtitle">Lunar <span class="hlt">drill</span> and test apparatus</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Norrington, David W.; Ardoin, Didier C.; Alexander, Stephen G.; Rowland, Philip N.; Vastakis, Frank N.; Linsey, Steven L.</p> <p>1988-01-01</p> <p>The design of an experimental lunar <span class="hlt">drill</span> and a facility to test the <span class="hlt">drill</span> under simulated lunar conditions is described. The <span class="hlt">drill</span> utilizes a polycrystalline diamond compact drag bit and an auger to mechanically remove cuttings from the hole. The <span class="hlt">drill</span> will be tested in a vacuum chamber and powered through a vacuum seal by a drive mechanism located above the chamber. A general description of the design is provided followed by a detailed description and analysis of each component. Recommendations for the further development of the design are included.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=DOE-PATENT-XML&redirectUrl=http://www.osti.gov/doepatents/biblio/1175767"><span id="translatedtitle">Transducer for downhole <span class="hlt">drilling</span> components</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Hall, David R; Fox, Joe R</p> <p>2006-05-30</p> <p>A robust transmission element for transmitting information between downhole tools, such as sections of <span class="hlt">drill</span> pipe, in the presence of hostile environmental conditions, such as heat, dirt, rocks, mud, fluids, lubricants, and the like. The transmission element maintains reliable connectivity between transmission elements, thereby providing an uninterrupted flow of information between <span class="hlt">drill</span> string components. A transmission element is mounted within a recess proximate a mating surface of a downhole <span class="hlt">drilling</span> component, such as a section of <span class="hlt">drill</span> pipe. The transmission element may include an annular housing forming a trough, an electrical conductor disposed within the trough, and an MCEI material disposed between the annular housing and the electrical conductor.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASA-TRS&redirectUrl=http://hdl.handle.net/2060/20110012606"><span id="translatedtitle">Scoring Dawg <span class="hlt">Core</span> Breakoff and Retention Mechanism</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Badescu, Mircea; Sherrit, Stewart; Bar-Cohen, Yoseph; Bao, Xiaoqi; Backes, Paul G.</p> <p>2011-01-01</p> <p>This novel <span class="hlt">core</span> break-off and retention mechanism consists of a scoring dawg controlled by a set of two tubes (a <span class="hlt">drill</span> tube and an inner tube). The <span class="hlt">drill</span> tube and the inner tube have longitudinal concentric holes. The solution can be implemented in an eccentric tube configuration as well where the tubes have eccentric longitudinal holes. The inner tube presents at the bottom two control surfaces for controlling the orientation of the scoring dawg. The <span class="hlt">drill</span> tube presents a sunk-in profile on the inside of the wall for housing the scoring dawg. The inner tube rotation relative to the <span class="hlt">drill</span> tube actively controls the orientation of the scoring dawg and hence its penetration and retrieval from the <span class="hlt">core</span>. The scoring dawg presents a shaft, two axially spaced arms, and a tooth. The two arms slide on the control surfaces of the inner tube. The tooth, when rotated, can penetrate or be extracted from the <span class="hlt">core</span>. During <span class="hlt">drilling</span>, the two tubes move together maintaining the scoring dawg completely outside the <span class="hlt">core</span>. After the desired <span class="hlt">drilling</span> depth has been reached the inner tube is rotated relative to the <span class="hlt">drill</span> tube such that the tooth of the scoring dawg moves toward the central axis. By rotating the <span class="hlt">drill</span> tube, the scoring dawg can score the <span class="hlt">core</span> and so reduce its cross sectional area. The scoring dawg can also act as a stress concentrator for breaking the <span class="hlt">core</span> in torsion or tension. After breaking the <span class="hlt">core</span>, the scoring dawg can act as a <span class="hlt">core</span> retention mechanism. For scoring, it requires the <span class="hlt">core</span> to be attached to the rock. If the <span class="hlt">core</span> is broken, the dawg can be used as a retention mechanism. The scoring dawg requires a hard-tip insert like tungsten carbide for scoring hard rocks. The relative rotation of the two tubes can be controlled manually or by an additional actuator. In the implemented design solution the bit rotation for scoring was in the same direction as the <span class="hlt">drilling</span>. The device was tested for limestone <span class="hlt">cores</span> and basalt <span class="hlt">cores</span>. The torque required for breaking the 10-mm diameter limestone <span class="hlt">cores</span> was 5 to 5.8 lb-in. (0.56 to 0.66 N-m).</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2011AGUFM.H21E1160P"><span id="translatedtitle">Regional <span class="hlt">Geophysical</span> Reconnaissance for Low Enthalpy Geothermal Resources in NE Alberta, Canada</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Poureslami Ardakani, E.; Schmitt, D.; Bown, T.; Chan, J.; Idowu, S.; Majorowicz, J. A.; Unsworth, M. J.; van der Baan, M.; Bauer, K.; Moeck, I.; Pussak, M.; Weides, S.</p> <p>2011-12-01</p> <p>As part of the Helmholtz-Alberta Initiative (HAI), a major initial goal is to undertake a critical study of the potential for Engineered Geothermal Systems (EGS) as a source of thermal energy in northern Alberta. The geology of this area consists to first order as westward thickening wedge of Cretaceous siliclastics overlying Devonian carbonates and evaporites all of which lies upon the metamorphic Canadian Shield craton. Generally, the north eastern of Alberta is characterized by low geothermal gradients (near 20 mK/m) and temperatures; and deep <span class="hlt">drilling</span> to as much as 4-5 km into the craton will be necessary to obtain requisite conditions (i.e. 80-100 C water at the source). Consequently, at this early stage it is important to search for zones with the greatest potential; and in the context of EGS this can mean finding greater fracture permeability through pre-existing faults and joint systems. State of stress information is also being considered as this will be an important constraint on fluid flow in such fractured systems. Current studies are integrating reprocessed legacy industrial and LITHOPROBE seismic reflection profiles, high-resolution aeromagnetic and gravity surveys, and existing borehole and <span class="hlt">core</span> data are used to develop regional <span class="hlt">geophysical</span> and geological models of Northern Alberta. Particular areas will focus on structural and tectonic linkages between the sedimentary basin and the underlying craton that are possibly related to, for example, Devonian reef complexes, extensive karsting, or evaporite collapse.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/10152637"><span id="translatedtitle">[Branched horizontal well <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Grigoryan, A.M.</p> <p>1993-05-01</p> <p>In the former USSR, invented the technology of <span class="hlt">drilling</span> and brought the industrial level a new type of oil wells - Grigoryan Branched-Horizontal wells. Tens of experimental wells had been <span class="hlt">drilled</span> and successfully operated for a long period of time. The technology itself is unique, it was developed in isolation from the West and has left far behind all known methods by its effectiveness and technical characteristics. A single hole horizontal <span class="hlt">drilling</span> which is being now applied all around the world is a small part of this method. A branched well has several additional holes with their branches. Such well is incomparably more effective than single horizontal hole as the branches penetrate in all directions the whole mass of productive formation by their canals free for oil inflow from distant zones, often isolated. In modern application this method enables to get wells with up to 20 times higher production rates and simultaneously 5 times less oil production costs. In order to commercialize technology a ``Grigoryan Branched-Horizontal wells Co.`` is being established for the development of oil fields, on ownership, lease or contractor basis. The Branched-Horizontal wells are especially effective in high thickness oil reservoirs with highly irregular porosity and rock permeability where the percentage of oil recovery is low while the potential reserves are very large. If in such a field oil Production of conventional well is only 10--20 ton (60--180 barrels) per day, one Branched-Horizontal well will produce an additional 10 million dollars worth of oil even during the first year of operation. This is the oil extracted from the bowels of the earth above the capacity of ordinary wells and inaccessible for them. Taking into consideration the fact that on average, only 20% of natural resources are being extracted around the world, the main advantage of this method is in doubling the recoverable reserves thus moving far ahead the predicted exhaustion of fossil hydrocarbons.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/biblio/6535802"><span id="translatedtitle">[Branched horizontal well <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Grigoryan, A.M.</p> <p>1993-01-01</p> <p>In the former USSR, invented the technology of <span class="hlt">drilling</span> and brought the industrial level a new type of oil wells - Grigoryan Branched-Horizontal wells. Tens of experimental wells had been <span class="hlt">drilled</span> and successfully operated for a long period of time. The technology itself is unique, it was developed in isolation from the West and has left far behind all known methods by its effectiveness and technical characteristics. A single hole horizontal <span class="hlt">drilling</span> which is being now applied all around the world is a small part of this method. A branched well has several additional holes with their branches. Such well is incomparably more effective than single horizontal hole as the branches penetrate in all directions the whole mass of productive formation by their canals free for oil inflow from distant zones, often isolated. In modern application this method enables to get wells with up to 20 times higher production rates and simultaneously 5 times less oil production costs. In order to commercialize technology a Grigoryan Branched-Horizontal wells Co.'' is being established for the development of oil fields, on ownership, lease or contractor basis. The Branched-Horizontal wells are especially effective in high thickness oil reservoirs with highly irregular porosity and rock permeability where the percentage of oil recovery is low while the potential reserves are very large. If in such a field oil Production of conventional well is only 10--20 ton (60--180 barrels) per day, one Branched-Horizontal well will produce an additional 10 million dollars worth of oil even during the first year of operation. This is the oil extracted from the bowels of the earth above the capacity of ordinary wells and inaccessible for them. Taking into consideration the fact that on average, only 20% of natural resources are being extracted around the world, the main advantage of this method is in doubling the recoverable reserves thus moving far ahead the predicted exhaustion of fossil hydrocarbons.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/5901136"><span id="translatedtitle">An innovative <span class="hlt">drilling</span> system</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Nees, J.; Dickinson, E.; Dickinson, W.; Dykstra, H.</p> <p>1991-05-01</p> <p>The principal project objectives were the following: To demonstrate the capability of the Ultrashort Radius Radial System to <span class="hlt">drill</span> and complete multiple horizontal radials in a heavy oil formation which had a production history of thermal operations. To study the effects that horizontal radials have on steam placement at specific elevations and on reducing gravity override. To demonstrate that horizontal radials could be utilized for cyclic production, i.e. for purposes of oil production as well as for steam injection. Each of these objectives was successfully achieved in the project. Early production results indicate that radials positively influenced cyclic performance. This report documents those results. 15 refs., 29 figs., 1 tab.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li class="active"><span>24</span></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_24 --> <div id="page_25" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li class="active"><span>25</span></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="481"> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://oaktrust.library.tamu.edu//handle/1969.1/ETD-TAMU-1972-THESIS-G176"><span id="translatedtitle">Computer aided <span class="hlt">drill</span> emulator </span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p>Galvin, Daniel Lisenbee</p> <p>1972-01-01</p> <p>, but it holds for block formation bands also, For the block formation style bands much practice time could be saved if details of the <span class="hlt">drill</span> could be simulated to provide informa- tion on timing, music coordination, and visual effect. Present charting methods... the director could see that a certain sequence of maneuvers could be performed. He would have some idea of the visual effect provided by the execution of those commands. At the same time precise timings could be available to him. The d1rector would thus...</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/6051114"><span id="translatedtitle">Geothermal corehole <span class="hlt">drilling</span> and operations, Platanares, Honduras, Central America</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Goff, S.; Rufenacht, H.D.; Laughlin, A.W.; Adams, A.; Planner, H.; Ramos, N.</p> <p>1987-01-01</p> <p>Two slim exploration coreholes to depths of 650 m and 428 m, respectively, have been completed at the Platanares geothermal site, Honduras, Central America. A third corehole is now being <span class="hlt">drilled</span>. These boreholes have provided information on the stratigraphy, temperature variation with depth, nature and compositions of fluids, fracturing, permeability, and hydrothermal alterations associated with the geothermal reservoir. Eruptions of hot water occurred during the <span class="hlt">drilling</span> of both the first and third boreholes. Recovery of >98% <span class="hlt">core</span> has been obtained even under difficult superheated conditions.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=EPRINT&redirectUrl=http://biorobotics.harvard.edu/pubs/2012/contrib/DMD2012_Loschak.pdf"><span id="translatedtitle">Cranial <span class="hlt">Drilling</span> Tool with Retracting <span class="hlt">Drill</span> Bit Upon Skull Penetration</span></a></p> <p><a target="_blank" href="http://www.osti.gov/eprints/">E-print Network</a></p> <p></p> <p></p> <p>Cranial <span class="hlt">Drilling</span> Tool with Retracting <span class="hlt">Drill</span> Bit Upon Skull Penetration Paul Loschak1 , Kechao Xiao1, Harvard University, Boston, MA 3 Beth Israel Deaconess Medical Center 1 Background Penetrating the skull as a injury [1]. The risk of pressure induced damage can be reduced by penetrating the skull with a small</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/344968"><span id="translatedtitle">Activity plan: Directional <span class="hlt">drilling</span> and environmental measurements while <span class="hlt">drilling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Myers, D.A.</p> <p>1998-07-16</p> <p>This activity plan describes the testing of directional <span class="hlt">drilling</span> combined with environmental measurements while <span class="hlt">drilling</span> at two Hanford Site locations. A cold test is to be conducted at the 105A Mock Tank Leak Facility in the 200 East Area. A hot test is proposed to be run at the 216-B-8 tile field north of the 241-B Tank Farm in 200 East Area. Criteria to judge the success, partial success or failure of various aspects of the test are included. The TWRS program is assessing the potential for use of directional <span class="hlt">drilling</span> because of an identified need to interrogate the vadose zone beneath the single-shell tanks. Because every precaution must be taken to assure that investigation activities do not violate the integrity of the tanks, control of the <span class="hlt">drill</span> bit and ability to follow a predetermined <span class="hlt">drill</span> path are of utmost importance and are being tested.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-MAS&redirectUrl=http://academic.research.microsoft.com/Publication/61329805"><span id="translatedtitle">An efficient simulation model for nuclear <span class="hlt">geophysical</span> measurements</span></a></p> <p><a target="_blank" href="http://academic.research.microsoft.com/">Microsoft Academic Search </a></p> <p>R. D. Wilson; T. K. Cook; S. H. Dean</p> <p>1987-01-01</p> <p>Nuclear measurements that provide data related to <span class="hlt">geophysical</span> parameters have been used for many years in well-logging, surface surveys, and laboratory <span class="hlt">core</span> studies. The measurement process can be considered in two parts: (1) the transport of nuclear radiation from source to detector; and (2) the interaction of the transported radiation with the detector. For certain measurement problems, the radiation transport</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2015EGUGA..17.3355C"><span id="translatedtitle">The SUBGLACIOR <span class="hlt">drilling</span> probe : concept and design</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chappellaz, Jérôme; Alemany, Olivier; Triest, Jack; The Subglacior Team</p> <p>2015-04-01</p> <p>In response to the 'oldest ice' challenge initiated by the International Partnerships in Ice <span class="hlt">Core</span> Sciences (IPICS), new rapid-access <span class="hlt">drilling</span> technologies through glacier ice need to be developed. These will provide the information needed to qualify potential sites on the Antarctic ice sheet where the deepest section could include ice that is >1Ma old and still in good stratigraphic order. Identifying a suitable site will be a prerequisite for deploying a multi-year deep ice-<span class="hlt">core</span> <span class="hlt">drilling</span> operation to elucidate the cause and mechanisms of the mid-Pleistocene transition from 40 ka glacial-interglacial cycles to 100 ka cycles. As part of the ICE&LASERS/SUBGLACIOR projects, we have designed an innovative probe, SUBGLACIOR, with the aim of perforating the ice sheet down to the bedrock in a single season and continuously measuring in situ the isotopic composition of the melted water and the methane concentration in trapped gases. We will present the general concept of the probe, as well as the various technological solutions that we have favored so far to reach this goal.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=SCIGOV-STC&redirectUrl=http://www.osti.gov/scitech/servlets/purl/912730"><span id="translatedtitle">Summary Report of <span class="hlt">Geophysical</span> Logging For The Seismic Boreholes Project at the Hanford Site Waste Treatment Plant.</span></a></p> <p><a target="_blank" href="http://www.osti.gov/scitech">SciTech Connect</a></p> <p>Gardner, Martin G.; Price, Randall K.</p> <p>2007-02-01</p> <p>During the period of June through October 2006, three deep boreholes and one corehole were <span class="hlt">drilled</span> beneath the site of the Waste Treatment Plant (WTP) at the U.S. Department of Energy (DOE) Hanford Site near Richland, Washington. The boreholes were <span class="hlt">drilled</span> to provide information on ground-motion attenuation in the basalt and interbedded sediments underlying the WTP site. This report describes the <span class="hlt">geophysical</span> logging of the deep boreholes that was conducted in support of the Seismic Boreholes Project, defined below. The detailed <span class="hlt">drilling</span> and geological descriptions of the boreholes and seismic data collected and analysis of that data are reported elsewhere.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=NASAADS&redirectUrl=http://adsabs.harvard.edu/abs/2004AGUFMED41C..05H"><span id="translatedtitle">Undergraduate Student Research with the Integrated Ocean <span class="hlt">Drilling</span> Program on Expedition 301</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hawkins, L. K.; Housen, B. A.; Sager, W. W.; Expedition 301 Scientific Party, T.</p> <p>2004-12-01</p> <p>I was invited to participate as a shipboard scientist on board the JOIDES Resolution during Expedition 301 of the Integrated Ocean <span class="hlt">Drilling</span> Program (IODP). The scientific objectives of this expedition were to establish borehole observatories to evaluate the hydrogeologic properties within oceanic crust, determine how fluid pathways are distributed within an active hydrothermal system, establish linkages between fluid circulation, alteration, and geomicrobial processes and determine relations between seismic and hydrologic anisotropy. I worked as a paleomagnetics shipboard scientist with William Sager from Texas A&M University. My primary responsibility was to produce the initial paleomagnetic data through alternating field and thermal demagnetization for the sediments and basement rocks recovered during the expedition. The magnetic data obtained from samples recovered from the 220 m basaltic section that was <span class="hlt">drilled</span> show some consistency with expected normal polarity acquired at high-mid latitudes and some reversed polarity or low inclination values which may be related to alteration. Additionally, I assisted in <span class="hlt">core</span> curation and processing, the underway <span class="hlt">geophysics</span> lab, and with <span class="hlt">core</span> description. I was included in the scientific meetings discussing sample handling, preliminary results, on-going developments, and post-cruise research. My post-cruise project, under the direction of William Sager and Bernard Housen of Western Washington University, investigates magnetic properties of the basaltic rock from the upper oceanic crust. The primary goal of this work will be to refine our understanding of the magnetization process and geomagnetic field geometry recorded by young (< 3.5 Ma) oceanic crust. This experience was invaluable to me as an aspiring scientist. I was participating in cutting edge research with renowned scientists who were working on subjects of global interest and I was not reading chapters out of a textbook. The scientists showed me a glimpse of what the future may be for me, including some of the challenges as well as benefits. I also received guidance for post-baccalaureate study, made contact with professors, post-docs, and graduate students outside my university, and formed life-long friendships. I cherished this opportunity and I look forward to sharing more of my undergraduate research experiences with others.</p> </li> <li> <p><a target="resultTitleLink" href="http://www.science.gov/scigov/desktop/en/ostiblue/service/link/track?type=RESULT&searchId=topic-pages&collectionCode=CFR2012&redirectUrl=http://www.gpo.gov:80/fdsys/pkg/CFR-2012-title30-vol1/pdf/CFR-2012-title30-vol1-sec33-34.pdf"><span id="translatedtitle">30 CFR 33.34 - <span class="hlt">Drilling</span> test.</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-07-01</p> <p>...ADMINISTRATION, DEPARTMENT OF LABOR TESTING, EVAL