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Petroleum Geology & Experiment  2019, Vol. 41 Issue (5): 699-707    DOI: 10.11781/sysydz201905699
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Sedimentary characteristics of Permian-Triassic in Yangkang area, South Qilian Basin
YAO Haifeng1, WANG Jia2, TAN Xianfeng2, CHEN Lei1, YANG Cheng1, XIAO Long1, LIU Shiming1, JIANG Cong2
1. Qinghai Bureau of Coal Geology, Xining, Qinghai 810001, China;
2. School of Petroleum Engineering, Chongqing University of Science & Technology, Chongqing 401331, China
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Abstract  The field geological profile measurement and the thin section identification of rocks were used, combined with stratigraphy, sedimentary petrology and petroliferous basin analyses, to study the rock assemblage types and sedimentary facies evolution of the Permian-Triassic in the Yangkang Uplift and its surrounding areas, the South Qilian Basin. The study area is mainly composed of three tectonic units:the Yangkang Uplift, the Halahu Depression and the Xiariha Depression. The Middle Permian to Upper Triassic strata were well developed and lithologically variable. The sediments include carbonate platform, shallow shelf, littoral, delta, fluvial and lacustrine facies. There are two distinct sedimentary cycles, corresponding to two large-scale transgressive and regressive deposits. The tectonic evolution of the study area is the key factor determining its sedimentary evolution. Since the Caledonian Movement, the Yangkang Uplift existed as a paleo-uplift, which controlled the whole Permian-Triassic sedimentary paleogeographic environment. The uplift has not received sediments since the Late Silurian, and only includes Permian-Triassic strata in the Halahu Depression and the Xiariha Depression.
Key wordssedimentary evolution      sedimentary facies      oil and gas geology      Permian      Triassic      Yangkang area      Southern Qilian Basin     
Received: 09 July 2019      Published: 23 September 2019
ZTFLH:  TE121.3  
Cite this article:

.Sedimentary characteristics of Permian-Triassic in Yangkang area, South Qilian Basin[J].Petroleum Geology & Experiment,2019,41(5):699-707.

URL:

http://www.sysydz.net/EN/10.11781/sysydz201905699     OR     http://www.sysydz.net/EN/Y2019/V41/I5/699

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