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DOI	10.1306/03172017081
	Gravity-flow deposits caused by different initiation processes in a deep-lake system
	Yang T.; Cao Y.; Liu K.; Tian J.; Carlos Z.; Wang Y.
发表日期	2020
ISSN	0149-1423
起始页码	1463
结束页码	1499
卷号	104 期号:7
英文摘要	Gravity flows may be triggered by different initiation processes in both marine and lacustrine basins. Recognizing the different initiation processes of gravity flow based on their deposits is vital to accurately establish gravity-flow sandstone distribution, which is important for defining paleogeography and for efficient oil and gas exploration. Gravity-flow deposits in the Dongying sag were analyzed using three-dimensional seismic, well-log, grain size, and porosity and permeability data, along with core descriptions. Eleven lithofacies, nine bed types, and six bed-type associations were recognized in the gravity-flow deposits in the Dongying sag. Gravity-flow deposits around well Niu-110 were caused by delta-fed sediment failure. These deposits are characterized by medium to very fine-grained sandstone, abundant liquefaction and soft-sediment deformation structures, and thick laminae rich in plant debris. They formed massive sandstones accompanied by normally graded sandstone and lenticular-shaped sandbodies and are composed of chaotic deposits and tongue lobes. The above features collectively are indicative of typical collapsed-sediment transport to deep water by slumping and poorly cohesive debris flow to low-density turbidity current. Gravity-flow deposits around well Shi-100 are interpreted to have been caused by flooding river-fed hyperpycnal flows. These deposits are characterized by gravel to very fine-grained sand, abundant erosional structures and climbing ripples, and thin laminae rich in plant debris. They formed massive sandstone with some space stratification accompanied by inverse-then-normal grading sandstone and elongate or fan-shaped sandbodies and are composed of channel-levee systems and lobes. Stratified hyperpycnal flow is prone to form a hydraulic jump at the slope break. After the hydraulic jump, coarse-grained sediments were transported to the basin under the drag and shear of the upper part of the suspension flow. Gravity-flow deposits caused by flooding river-fed hyperpycnal flow are better reservoirs than those caused by delta-fed sediment failure under the same conditions. This study offers insight into the recognition criteria and flow processes of gravity flows caused by the different initiation processes in a lacustrine basin. © 2020. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Debris; Deposits; Floods; Grading; Hydraulic jump; Ocean currents; Offshore gas fields; Oil well logging; Petroleum prospecting; Reservoirs (water); Sandstone; Sediment transport; Suspended sediments; Suspensions (fluids); Well logging; Coarse-grained sediments; Fine-grained sand; Hyperpycnal flows; Initiation process; Lacustrine basins; Low density turbidity current; Oil and gas exploration; Soft-sediment deformation structures; Shear flow; debris flow; deep water; grain size; gravity flow; lake water; river channel; sand; sandstone; sediment transport; turbidity; turbidity current; woody debris; China; Dongying; Shandong
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/143688
作者单位	State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, China; Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, China; Departamento de Geología, Universidad Nacional del Sur, Bahía Blanca, San Juan, Argentina
推荐引用方式 GB/T 7714	Yang T.,Cao Y.,Liu K.,et al. Gravity-flow deposits caused by different initiation processes in a deep-lake system[J],2020,104(7).
APA	Yang T.,Cao Y.,Liu K.,Tian J.,Carlos Z.,&Wang Y..(2020).Gravity-flow deposits caused by different initiation processes in a deep-lake system.AAPG Bulletin,104(7).
MLA	Yang T.,et al."Gravity-flow deposits caused by different initiation processes in a deep-lake system".AAPG Bulletin 104.7(2020).