Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (3): 83-91.doi: 10.3969/j.issn.1673-8926.2017.03.010

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Characteristics and main controlling factors of shale gas reservoirs: a case from Longmaxi Formation in Baojing area, NW Hunan province

HU Bowen1, LI Bin1, LU Dongsheng1, LUO Qun2, LI Jianxin1, WANG Yilin1   

  1. 1. Shenhua Geological Exploration Co., Ltd., Beijing 102209, China;
    2. The Unconventional Natural Gas Institute, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2016-09-10 Revised:2016-10-25 Online:2017-05-21 Published:2017-05-21

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Abstract: The organic-rich shale of Longmaxi Formation is an important shale gas exploration horizon in Baojing area, NW Hunan Province. In order to study the characteristics of Longmaxi shale gas reservoir and gas occurrence rule, combined with field geologic investigation, the data of mineralogy, organic geochemistry, physical properties, gas-bearing property, isothermal adsorption, scanning electronic microscope and Nano-CT, were used to analyze the characteristics of lithofacies and reservoir and main controlling factors for the gas-bearing property of Longmaxi shale. The results show that three types of lithofacies are developed in the Longmaxi Formation,including carbon-silty shale, carbonaceous shale and carbon-argillaceous siltstone; the main pore types are intergranular pores, dissolved pores, intercrystalline pores, fossil pores, organic pores and micro-fractures. The main types of fractures are structural fractures and diagenetic fracture. According to the pore size, the reservoir pore can be divided into micropores, mesopores and macropores. Mesopores have the biggest contribution to the whole pore volume,followed by micropores, and the macropores have the minimum proportion in the whole pore volume. The analysis shows that the microporous volume and surface area of shale have a good positive correlation with the largest methane adsorption contents,which are both controlled by TOC content in shale. Microfractures have a good positive correlation with gas content,which indicates that the micro-fracture has an important influence on shale gas-bearing properties. The results of Nano-CT show that most of the gas flow spaces are organic pores and micro-fractures. The organic matter content and the development of micro-fractures are the main controlling factors for the enrichment of shale gas.

Key words: granite reservoir, accumulation and enrichment factors, reservoir, trap, symbiotic composite accumulation

CLC Number: 

  • P624
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