鄂尔多斯盆地南部三叠系延长组湖相重力流沉积细粒岩及其油气地质意义

doi:10.7605/gdlxb.2017.05.062

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Abstract

With deepening research on the development of shale oil and gas development and related fields,transportation and deposition of fine-grained sediments have been a significant area of research in the stratigraphic community. However,muddy gravity￣flow deposits in the Mesozoic lacustrine environment in China have received little attentions. Based on core examinations,thin section identifications and comprehensive analysis,current study investigate sedimentary features of muddy gravity￣flow deposits in the Late Triassic southern Ordos Basin,and discuss their genesis and classifications. Various types of lacustrine mudstones or shales were recognized in the Yanchang Formation in the southern Ordos Basin,including muddy slumps,muddy debris flows,muddy turbidity currents and muddy hyperpycnal flows. Gravity￣flow deposits are classified into three types, namely sandy gravity￣flow deposits,muddy gravity￣flow deposits and hybrid gravity￣flow deposits. Based on mud contents and gravity flows’ originations, four types of slumps,debris flows,turbidity currents and hyperpycnal flows were inferred. And then they are classified into 12 types based on origination and mud content. Slumps and debrites mainly occur near to toe slope of delta fronts, while turbidites and hyperpycnites are well developed in large extent from delta slopes to basin plains. It is considered that (1) mud can be transported and deposited by active hydrodynamics; (2) fine-grained deposits created by gravity flows take a high percentage in lacustrine mudstones and shales; (3) muddy gravity flows are significant in transportations and depositions of clastic particles,clay minerals and organic matters, and are thus of great significance to hydrocarbon generating,reservoir capability and research on fracturing to unconventional oil and gas.

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Key words： gravity flow fine-grained deposits muddy debrite muddy turbidite muddy hyperpycnite unconventional oil and gas Ordos Basin Yanchang Formation

Received: 08 October 2016

ZTFLH:

Fund:

Co-funded by the National Natural Science Foundation of China: Depositional Mechanisms of the Late Triassic Hyperpycnites in the Southern Ordos Basin (No.41372135) and Sedimentary Features and Depositional Processes of Muddy Gravity￣flows Deposits in the Yanchang Formation in the Southern Ordos Basin (No.40872024), and Shandong University of Science and Technology Research Fund (No.2015TDJH101)

About author: Yang Renchao,born in 1976,Ph.D.,is an associate professor of Shandong University of Science and Technology. He is currently engaged in researches of sedimentology and petroluem geology. E-mail: yang100808@126.com

Cite this article:

. Fine-grained, lacustrine gravity-flow deposits and their hydrocarbon significance in the Triassic Yanchang Formation in southern Ordos Basin[J]. JOPC, 2017, 19(5): 791-806.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2017.05.062 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2017/V19/I5/791

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