Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 105-114.doi: 10.12108/yxyqc.20190212

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Adsorption capacity and controlling factors of marine-continental transitional shale in Xiangzhong Depression

YANG Tao1,2, ZENG Lianbo1, NIE Haikuan2, FENG Dongjun2, BAO Hanyong3, WANG Ruyue1,2   

  1. 1. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    2. Research Institute of Petroleum Exploration and Production, Sinopec, Beijing 100083, China;
    3. Research Institute of Exploration and Development, Sinopec Jianghan Oilfield Company, Wuhan 430223, China
  • Received:2018-09-18 Revised:2018-11-25 Online:2019-03-21 Published:2019-03-21

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Abstract: In order to study the adsorption capacity and controlling factors of black shale of Permian Longtan Formation and Dalong Formation in Xiangzhong Depression,a variety of experimental analyses such as total rock mineral content,organic geochemistry,reservoir physical properties and isothermal adsorption were carried out. The results show that:(1) Shales are mainly siliceous shales with an average quartz mass fraction of 34.4%,mostly biogenic silicon,and average clay mineral mass fraction of 24.4%. The mineral composition characteristics are similar to those of Barnett shale in the United States and high-quality marine shale of Paleozoic in Sichuan Basin. (2) Kerogen in shale is mainly type Ⅱ2,which is in mature stage. The average TOC mass fraction is 2.63%. Organic pores are developed,mainly micropores and mesopores. (3) Shale has a strong adsorption capacity,and the saturated adsorption mass volume is 0.75-8.60 m3/t,with an average of 4.51 m3/t,which has good methane adsorption capacity. (4) Shale adsorption capacity is mainly controlled by TOC content,chloroform asphalt "A",total hydrocarbon,quartz content,rock density and pore structure. Among them,TOC content is the most significant controlling factor. The marine-continental transitional shale in Xiangzhong Depression has great exploration potential.

Key words: marine-continental transitional facies, shale gas, TOC content, adsorption capacity, Permian, Xiangzhong Depression

CLC Number: 

  • TE122
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