Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (1): 27-34.doi: 10.3969/j.issn.1673-8926.2017.01.004

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Lithofacies types and sedimentary facies of Pinghu Formation in Xihu Depression

WU Jiapeng1, WAN Lifen2, ZHANG Lan3, WANG Yingmin4, ZHAO Qianhui5, LI Kun2, WANG Siqi6   

  1. 1. Geoscience Centre, CNPC Greatwall Drilling Company, Beijing 100101, China;
    2. Sinopec Shanghai Offshore Oil & Gas Company, Shanghai 200120, China;
    3. Shanghai Branch of CNOOC Ltd., Shanghai 200030, China;
    4. Ocean College, Zhejiang University, Hangzhou 310058, China;
    5. International Business Department of China Petroleum Pipeline Bureau, Langfang 065000, Hebei, China;
    6. School of Energy Resources, China university of Geosciences, Beijing 100083, China
  • Received:2016-07-29 Revised:2016-12-16 Online:2017-01-21 Published:2017-01-21

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Abstract: The research on sedimentary facies of Pinghu Formation in Xihu Depression is relatively limited,and the types of sedimentary facies,distribution characteristics and sedimentary model are unclear. Based on grain size and sedimentary structures of cores from 46 wells,the lithofacies of Pinghu Formation was identified. Then according to genetic types of lithofacies,lithofacies assemblage characteristics and well logging features,the sedimentary facies of Pinghu Formation was identified. The lithofacies was divided into three types：conglomerate facies,sandstone facies and fine- grained facies. The main sedimentary facies are tidal delta,tidal flat and confined shallow marine,which can be divided into several subfacies including delta plain,delta front, prodelta, supratidal zone,intertidal zone,subtidal zone,and shelf sand ridge etc. Considering the influencing factors such as the regional tectonic movement,palaeogeomorphology,provenance supply at the different Pinghu stage,the provenance-sedimentary model both controlled by half graben and tidal action of Pinghu Formation in Xihu Depression was established,which provides the base for further reservoir research.

CLC Number: 

  • TE122.1
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