气候变化领域集成服务门户(CCPortal): Sedimentology and stratigraphy of a deep-water gas hydrate reservoir in the northern Gulf of Mexico

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DOI	10.1306/05212019027
	Sedimentology and stratigraphy of a deep-water gas hydrate reservoir in the northern Gulf of Mexico
	Kevin Meazell P.; Flemings P.B.; Santra M.; Johnson J.E.
发表日期	2020
ISSN	0149-1423
起始页码	1945
结束页码	1969
卷号	104 期号:9
英文摘要	We interpret the sedimentologic evolution of a deep-water channel-levee deposit in Green Canyon Block 955 (deep-water Gulf of Mexico) by analyzing hydrate-bearing pressure cores and nonpressure cores collected during The University of Texas-Gulf of Mexico 2-1 (UT-GOM2-1) Hydrate Pressure Coring Expedition that preserve remarkable sedimentary structures. The levee is composed of alternating beds of sandy silt and clayey silt that range from millimeters to meters in thickness. We interpret that each couplet of sandy silt and clayey silt records a single turbidity current flow in which the upper part of the flow overtops the levee and is deposited along its flank. The sandy silt is coarser, its beds are thicker, and the fraction of sandy silt to clayey silt (net-to-gross) is greater near the base of the levee. We interpret that as the levee grew, the channel depth increased and a smaller fraction of the flow overtopped the levee. An increase in net-to-gross, both at the base and near the top of the cored section, may record an increase in the size of turbidity current flows or a decrease in the relative height of the levee. Based on the limited core recovery, we infer that the lithology of the bounding unit immediately above the hydrate-bearing unit is thinner bedded and has lower net-to-gross than the hydrate reservoir. The bounding unit below the hydrate-bearing interval is similarly thinner bedded, yet contains high saturations of hydrate. This study illuminates the lithologic architecture of leveed-channel turbidite reservoirs at core scale and provides insight into how lithology controls hydrate distribution and concentration. Copyright ©2020. The American Association of Petroleum Geologists. All rights reserved.
英文关键词	Embankments; Hydration; Levees; Lithology; Ocean currents; Sediment transport; Sedimentology; Silt; Stratigraphy; Turbidity; Bearing pressure; Deep-water channels; Hydrate distribution; Northern Gulf of Mexico; Sedimentary structure; Turbidite reservoirs; Turbidity current; University of Texas; Gas hydrates; clay soil; deep water; gas hydrate; levee; pore space; pressure field; sediment thickness; sedimentology; sequence stratigraphy; silt; turbidite; turbidity current; Atlantic Ocean; 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/168695
作者单位	Department of Geological Sciences, University of Texas at Austin, Austin, TX, United States; Institute for Geophysics, University of Texas at Austin, Austin, TX, United States; Department of Earth Sciences, University of New Hampshire, Durham, NH, United States
推荐引用方式 GB/T 7714	Kevin Meazell P.,Flemings P.B.,Santra M.,et al. Sedimentology and stratigraphy of a deep-water gas hydrate reservoir in the northern Gulf of Mexico[J],2020,104(9).
APA	Kevin Meazell P.,Flemings P.B.,Santra M.,&Johnson J.E..(2020).Sedimentology and stratigraphy of a deep-water gas hydrate reservoir in the northern Gulf of Mexico.AAPG Bulletin,104(9).
MLA	Kevin Meazell P.,et al."Sedimentology and stratigraphy of a deep-water gas hydrate reservoir in the northern Gulf of Mexico".AAPG Bulletin 104.9(2020).