Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (6): 10-17.doi: 10.12108/yxyqc.20180602

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Adsorptivity of shale under the formation temperature and pressure: a case of Longmaxi Formation in northeastern Chongqing

YU Chuan1,2, ZHOU Xun1,2, FANG Guangjian1,2, WANG Shengxiu1,2, YU Zhongqiang1,2   

  1. 1. Chongqing Shale Gas Research Center of State Key Laboratory of Petroleum Resource and Prospecting, Chongqing 400042, China;
    2. National Joint Engineering Research Center for Shale Gas Exploration and Development, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China
  • Received:2018-03-20 Revised:2018-05-16 Online:2018-11-16 Published:2018-11-16

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Abstract: Adsorptivity is a typical characteristic of shale gas reservoir and a key impact factor of shale gas content. The change rule of shale adsorptivity under the formation temperature and pressure was simulated by a heterothermal adsorption experiment with a case of Lower Silurian Longmaxi shale in northeastern Chongqing, so as to provide theoretical basis for shale gas exploration in this area. The result shows that organic matter is the main internal factor which impacts shale adsorptivity of Longmaxi Formation and the TOC content has a very positive correlation with the adsorption capacity of shale. The geological conditions of temperature and pressure are the external factors which impact shale adsorptivity. Temperature and pressure are mutual inhibitory for shale adsorptivity. With the increase of temperature and pressure, the variation tendency of shale adsorption capacity is similar to parabola. When temperature and pressure are relatively low, pressure plays a leading role, while temperature plays a leading role when temperature and pressure are relatively high. Under the underground condition, the best adsorption state of shale needs to achieve an appropriate matching of temperature, pressure and burial depth). The experimental simulation results show that the optimum theoretical adsorption state of Longmaxi shale in northeastern Chongqing should be at the depth of 1 000-4 500 m.

Key words: adsorptivity, temperature-pressure conditions, heterothermal adsorption experiment, Longmaxi Formation, northeastern Chongqing

CLC Number: 

  • P618.13
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