Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (4): 41-51.doi: 10.12108/yxyqc.20210405

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Shale lithofacies and reservoir characteristics of Wufeng Formation-lower Long 1 submember of Longmaxi Formation in western Chongqing

YIN Xingping1, JIANG Yuqiang1,2, FU Yonghong1,2, ZHANG Xuemei3, LEI Zhian4, CHEN Chao5, ZHANG Haijie4   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. Reservoir Evaluation Laboratory, PetroChina Key Laboratory of Unconventional Oil and Gas, Chengdu 610500, China;
    3. Sichuan Kehong Oil and Gas Engineering Co., Ltd., Chengdu 610056, China;
    4. Chongqing Shale Gas Exploration and Development Company Limited, Chongqing 610213, China;
    5. Sichuan Changing Natural Gas Development Company Limited, Chengdu 610056, China
  • Received:2020-08-25 Revised:2020-11-23 Online:2021-08-01 Published:2021-08-06

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Abstract: Shale in Wufeng Formation-lower Long 1 submember of Longmaxi Formation in western Chongqing has great potential of exploration and development. In order to clarify the difference of reservoir quality,longitudinal distribution law and influencing factors of reservoir development of different lithofacies,the lithofacies was divided combined with thin section identification,rock composition and geochemistry characteristics. Based on the data of organic carbon content,laminar structure,reservoir space and physical properties,and gas content, the reservoir characteristics,favorable lithofacies distribution and controlling factors of different lithofacies were determined. The results show that there are six kinds of shale lithofacies：organic-rich siliceous shale,moderateorganic siliceous shale,low-organic siliceous shale,low-organic calcareous siliceous shale,low-organic clay shale and extra-low-organic clay shale. The organic-rich siliceous shale is a high-quality shale reservoir with its sedimentary environment characterized by strong reducibility,deep water body,abundant organisms,high biogenic silicon content and well-developed argillaceous lamination,which is conducive to the development and preservation of contiguous organic matter and organic pores. It is mainly developed in sublayer-1 of Long 1 submember of Longmaxi Formation,providing favorable source-reservoir conditions for shale gas enrichment. The moderate-organic siliceous shale and low-organic siliceous shale are deposited in strong reducibility and shallow water sedimentary environment,with decreased organisms,low biogenic silicon content,frequent interbedding of silt lamination and argillaceous lamination,and organic pores are mainly developed in dispersed organic matter with good connectivity. So,they are potential exploitable shale gas reservoirs,and mainly developed in the top of Wufeng Formation,sublayer-2 and sublayer-3 of Long 1 submember of Longmaxi Formation. The research results deepen the understanding of the vertical distribution of favorable shale reservoirs in the study area, and provide basic data support for three-dimensional development of shale gas.

Key words: shale gas, lithofacies, reservoir characteristics, controlling factors, Longmaxi Formation, western Chongqing

CLC Number: 

  • TE122.2
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