Architecture of gas-hydrate-bearing sands from Walker Ridge 313, Green Canyon 955, and Alaminos Canyon 21: Northern deepwater Gulf of Mexico |
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| Affiliation: | 1. U.S. Department of Energy, National Energy Technology Laboratory, Morgantown, WV, USA;2. U.S. Bureau of Ocean Energy Management, Herndon, VA, USA;3. Schlumberger Limited, Houston, TX, USA;4. U.S. Bureau of Ocean Energy Management, New Orleans, LA, USA;5. AOA Geophysics, Houston, TX, USA;6. Lamont-Doherty Earth Observatory, Palisades, NY, USA;1. Methane Hydrate Research Center (MHRC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan;2. MHRC, AIST, Sapporo, Japan;1. National Institute of Undersea Science and Technology, University of Mississippi Field Station, University of Mississippi, University, MS 38677, USA;2. Mississippi Mineral Resources Institute and Center for Marine Resources and Environmental Technology, University of Mississippi, 111 Brevard Hall, MS 38677, USA;3. Leidos Inc., 10260 Campus Point Drive, M/S C2E, San Diego, CA 92121, USA;4. Department of Earth and Ocean Sciences, University of South Carolina, 701 Sumter St., EWS Building, Columbia, SC 29208, USA;5. EOAS-Oceanography, Florida State University, 117 N Woodward Ave, Tallahassee, FL 32306, USA;6. Chesapeake Biological Lab, University of Maryland Center for Environmental Science, P.O. Box 38, 146 Williams St., Solomons, MD 20688, USA;7. Sidney Geophysical Consultants, Ltd., 1107 Maple Road, N. Saanich, BC V8L 5P5, Canada;8. Fugro Survey Limited (Great Yarmouth) Morton Peto Road Gapton Hall Industrial Estate, Great Yarmouth NR31 0LT, United Kingdom;9. TDI-Brooks Int''l Inc., 1902 Pinon Dr., College Station, TX 77845, USA;1. Oil and Natural Gas Corporation Ltd, KDM Institute of Petroleum Exploration, 9 Kaulagarh Road, Dehradun 248195, Uttarakhand, India;2. U.S. Geological Survey, Denver Federal Center, MS-939, Box 25046, Denver, CO 80225, USA;3. U.S. Department of Energy, National Energy Technology Laboratory, 626 Cochran''s Mill Rd., Pittsburgh, PA 15236, USA;4. Lamont Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA;5. Directorate General of Hydrocarbons, Plot No 2, Sector 73, Noida, India;6. National Institute of Oceanography, Donapaula, Goa 403004, India;7. Mauritius Oceanography Institute, Victoria Avenue, Mauritius;8. Natural Resources Canada, 9860 West Saanich Road, Sidney, British Columbia V8L 4B2, Canada;9. National Geophysical Research Institute, Uppal Road, Hyderabad 500007, India;1. Methane Hydrate Research Center (MHRC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan;2. MHRC, AIST, Sapporo, Japan;1. U.S. Geological Survey, Woods Hole, MA, United States;2. U.S. Geological Survey, Denver, CO, United States;3. Geotek Coring Ltd, 4 Sopwith Way, Daventry, NN11 8PB, United Kingdom;4. Oil and Natural Gas Corporation, Panvel, Navi Mumbai, India;1. U.S. Department of Energy, National Energy Technology Laboratory, 626 Cochrans Mill Road, Pittsburgh, PA, USA;2. AECOM, 626 Cochrans Mill Road, Pittsburgh, PA, USA;3. Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA, USA;4. Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA;5. U.S. Geological Survey, Denver, CO, USA |
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| Abstract: | Logging-while-drilling data acquired during the 2009 Gulf of Mexico (GoM) Gas Hydrate Joint Industry Project Leg II program combined with features observed in seismic data allow assessment of the depositional environment, geometry, and internal architecture of gas-hydrate-bearing sand reservoirs from three sites in the northern Gulf of Mexico (GoM): Walker Ridge 313, Alaminos Canyon 21, and Green Canyon 955. The site descriptions assist in the understanding of the geological development of gas-hydrate-bearing sands and in the assessment of their energy production potential. Three sand-rich units are described from the Walker Ridge site, including multiple ponded sand-bodies representing turbidite channel and associated levee and terminal lobe environments within the Terrebonne basin on the lower slope of the GoM. Older units display fewer but greater-reservoir-quality channel and proximal levee facies as compared to thinner, more continuous, and unconfined sheet-like sands that characterize the younger units, suggesting a decrease in depositional gradient with time in the basin. The three wells in the Green Canyon 955 site penetrated proximal levee sands within a previously recognized Late Pleistocene basin floor turbidite-channel-levee complex. Reservoirs encountered in GC955 exhibit thin-bedded internal structure and complex fault compartmentalization. Two wells drilled in the Alaminos Canyon 21 site tested a large, shallow, sand unit within the Diana mini-basin that exhibits steep lateral margins, non-sinuous elongate form, and flat base with hummocky upper surface. These features suggest deposition as a mass-transport deposit consisting of remobilized sand-rich turbidites or as a large basin-floor fan that was potentially eroded and buried by later-stage, mud-prone, mass-transport deposits. |
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