Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico
This paper is not subject to U.S. copyright. The definitive version was published in Marine and Petroleum Geology 25 (2008): 906-918, doi:10.1016/j.marpetgeo.2008.01.012. The Keathley Canyon sites drilled in 2005 by the Chevron Joint Industry Project are located along the southeastern edge of an int...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/2617 2023-05-15T17:12:12+02:00 Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico Hutchinson, Deborah R. Hart, Patrick E. Collett, Timothy S. Edwards, K. M. Twichell, David C. Snyder, Fred 2008-05-10 application/pdf https://hdl.handle.net/1912/2617 en_US eng Elsevier B.V. https://doi.org/10.1016/j.marpetgeo.2008.01.012 Marine and Petroleum Geology 25 (2008): 906-918 https://hdl.handle.net/1912/2617 doi:10.1016/j.marpetgeo.2008.01.012 Marine and Petroleum Geology 25 (2008): 906-918 doi:10.1016/j.marpetgeo.2008.01.012 Gulf of Mexico Gas hydrate Methane hydrate Geologic framework Joint industry projects JIP Article 2008 ftwhoas https://doi.org/10.1016/j.marpetgeo.2008.01.012 2022-05-28T22:57:40Z This paper is not subject to U.S. copyright. The definitive version was published in Marine and Petroleum Geology 25 (2008): 906-918, doi:10.1016/j.marpetgeo.2008.01.012. The Keathley Canyon sites drilled in 2005 by the Chevron Joint Industry Project are located along the southeastern edge of an intraslope minibasin (Casey basin) in the northern Gulf of Mexico at 1335 m water depth. Around the drill sites, a grid of 2D high-resolution multichannel seismic data designed to image depths down to at least 1000 m sub-bottom reveals 7 unconformities and disconformities that, with the seafloor, bound 7 identifiable seismic stratigraphic units. A major disconformity in the middle of the units stands out for its angular baselapping geometry. From these data, three episodes of sedimentary deposition and deformation are inferred. The oldest episode consists of fine-grained muds deposited during a period of relative stability in the basin (units e, f, and g). Both the BSR and inferred gas hydrate occur within these older units. The gas hydrate occurs in near-vertical fractures. A second episode (units c and d) involved large vertical displacements associated with infilling and ponding of sediment. This second interval corresponds to deposition of intercalated fine and coarse-grained material that was recovered in the drill hole that penetrated the thin edges of the regionally much thicker units. The final episode of deposition (units a and b) occurred during more subdued vertical motions. Hemipelagic drape (unit a) characterizes the modern seafloor. The present-day Casey basin is mostly filled. Its sill is part of a subsiding graben structure that is only 10–20 m shallower than the deepest point in the basin, indicating that gravity-driven transport would mostly bypass the basin. Contemporary faulting along the basin margins has selectively reactivated an older group of faults. The intercalated sand and mud deposits of units c and d are tentatively correlated with Late Pleistocene deposition derived from the western ... Article in Journal/Newspaper Methane hydrate Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Marine and Petroleum Geology 25 9 906 918 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Gulf of Mexico Gas hydrate Methane hydrate Geologic framework Joint industry projects JIP |
spellingShingle |
Gulf of Mexico Gas hydrate Methane hydrate Geologic framework Joint industry projects JIP Hutchinson, Deborah R. Hart, Patrick E. Collett, Timothy S. Edwards, K. M. Twichell, David C. Snyder, Fred Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico |
topic_facet |
Gulf of Mexico Gas hydrate Methane hydrate Geologic framework Joint industry projects JIP |
description |
This paper is not subject to U.S. copyright. The definitive version was published in Marine and Petroleum Geology 25 (2008): 906-918, doi:10.1016/j.marpetgeo.2008.01.012. The Keathley Canyon sites drilled in 2005 by the Chevron Joint Industry Project are located along the southeastern edge of an intraslope minibasin (Casey basin) in the northern Gulf of Mexico at 1335 m water depth. Around the drill sites, a grid of 2D high-resolution multichannel seismic data designed to image depths down to at least 1000 m sub-bottom reveals 7 unconformities and disconformities that, with the seafloor, bound 7 identifiable seismic stratigraphic units. A major disconformity in the middle of the units stands out for its angular baselapping geometry. From these data, three episodes of sedimentary deposition and deformation are inferred. The oldest episode consists of fine-grained muds deposited during a period of relative stability in the basin (units e, f, and g). Both the BSR and inferred gas hydrate occur within these older units. The gas hydrate occurs in near-vertical fractures. A second episode (units c and d) involved large vertical displacements associated with infilling and ponding of sediment. This second interval corresponds to deposition of intercalated fine and coarse-grained material that was recovered in the drill hole that penetrated the thin edges of the regionally much thicker units. The final episode of deposition (units a and b) occurred during more subdued vertical motions. Hemipelagic drape (unit a) characterizes the modern seafloor. The present-day Casey basin is mostly filled. Its sill is part of a subsiding graben structure that is only 10–20 m shallower than the deepest point in the basin, indicating that gravity-driven transport would mostly bypass the basin. Contemporary faulting along the basin margins has selectively reactivated an older group of faults. The intercalated sand and mud deposits of units c and d are tentatively correlated with Late Pleistocene deposition derived from the western ... |
format |
Article in Journal/Newspaper |
author |
Hutchinson, Deborah R. Hart, Patrick E. Collett, Timothy S. Edwards, K. M. Twichell, David C. Snyder, Fred |
author_facet |
Hutchinson, Deborah R. Hart, Patrick E. Collett, Timothy S. Edwards, K. M. Twichell, David C. Snyder, Fred |
author_sort |
Hutchinson, Deborah R. |
title |
Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico |
title_short |
Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico |
title_full |
Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico |
title_fullStr |
Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico |
title_full_unstemmed |
Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico |
title_sort |
geologic framework of the 2005 keathley canyon gas hydrate research well, northern gulf of mexico |
publisher |
Elsevier B.V. |
publishDate |
2008 |
url |
https://hdl.handle.net/1912/2617 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Marine and Petroleum Geology 25 (2008): 906-918 doi:10.1016/j.marpetgeo.2008.01.012 |
op_relation |
https://doi.org/10.1016/j.marpetgeo.2008.01.012 Marine and Petroleum Geology 25 (2008): 906-918 https://hdl.handle.net/1912/2617 doi:10.1016/j.marpetgeo.2008.01.012 |
op_doi |
https://doi.org/10.1016/j.marpetgeo.2008.01.012 |
container_title |
Marine and Petroleum Geology |
container_volume |
25 |
container_issue |
9 |
container_start_page |
906 |
op_container_end_page |
918 |
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1766068997377228800 |