气候变化领域集成服务门户(CCPortal): Evolution of gas hydrate-bearing deep-water channel-levee system in abyssal Gulf of Mexico: Levee growth and deformation

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DOI	10.1306/04251918177
	Evolution of gas hydrate-bearing deep-water channel-levee system in abyssal Gulf of Mexico: Levee growth and deformation
	Santra M.; Flemings P.B.; Scott E.; Kevin Meazell P.
发表日期	2020
ISSN	0149-1423
起始页码	1921
结束页码	1944
卷号	104 期号:9
英文摘要	Gas hydrate in the Green Canyon area (Block 955) in the northern Gulf of Mexico is hosted by relatively clay-free silty levee deposits bounding a Pleistocene submarine channel. During the initial phase of channel development, the channel axis experienced sediment bypass while silty to sandy flanking levees formed. Development of high levees prompted gravitational collapse along normal faults dipping toward the channel axis. Extension at the levees was accompanied by compression at the channel axis. The gravitational failure caused rotation and displacement of the levee deposits. Later, deposition occurred within channel axis, whereas only fine-grained sediments accumulated on the levees. The change in depositional style is interpreted as the result of reduced height and strength of the turbidity currents moving along the channel at the later stage, which restricted most nonclay fraction sediments to the levee-confined channel. There is no gravitational failure in this stage, probably because relief between the levee crest and channel floor was reduced because of deposition within the channel. The hydrates are almost entirely restricted to the clay-poor levee deposits formed during the early stage of channel development, with minor hydrate accumulation in late-stage channel axial deposits. The silty levee reservoir is compartmentalized because of the presence of gravitational failure surfaces and an extensive network of salt-related normal faults. The results of this predominantly seismic stratigraphic study completed as a part of The University of Texas at Austin/US Department of Energy Deep-Water Methane Hydrate Characterization and Scientific Assessment project should be compared with sedimentological information from analysis of pressurized cores obtained during The University of Texas-Gulf of Mexico 2-1 (UT-GOM2-1) Hydrate Pressure Coring Expedition presented elsewhere in this volume. Copyright ©2020. The American Association of Petroleum Geologists. All rights reserved.
英文关键词	Clay deposits; Deposits; Fault slips; Gas hydrates; Hydration; Levees; Ocean currents; Sediment transport; Stratigraphy; Deep-water channels; Department of Energy; Fine-grained sediment; Gravitational collapse; Hydrate accumulations; Northern Gulf of Mexico; Submarine channel; University of Texas; Embankments; compression; deep water; deformation mechanism; depositional sequence; gas hydrate; Pleistocene; reservoir characterization; submarine channel; tectonic rotation; turbidity current; Atlantic Ocean; Austin [Texas]; Green Canyon; Gulf of Mexico; Texas; United States
语种	英语
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168694
作者单位	Institute for Geophysics, University of Texas at Austin, Austin, TX, United States; Department of Geological Sciences, University of Texas at Austin, Austin, TX, United States; E&P Geoscience, LLC, Houston, TX, United States
推荐引用方式 GB/T 7714	Santra M.,Flemings P.B.,Scott E.,et al. Evolution of gas hydrate-bearing deep-water channel-levee system in abyssal Gulf of Mexico: Levee growth and deformation[J],2020,104(9).
APA	Santra M.,Flemings P.B.,Scott E.,&Kevin Meazell P..(2020).Evolution of gas hydrate-bearing deep-water channel-levee system in abyssal Gulf of Mexico: Levee growth and deformation.AAPG Bulletin,104(9).
MLA	Santra M.,et al."Evolution of gas hydrate-bearing deep-water channel-levee system in abyssal Gulf of Mexico: Levee growth and deformation".AAPG Bulletin 104.9(2020).