Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (3): 92-99.doi: 10.12108/yxyqc.20180311

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Establishment of standard adsorption isotherms for shale reservoirs: a case of Chang 7 shale reservoir in Ordos Basin

HE Yanqing1, ZHENG Li2, YAN Changhui1, TIAN Yuanyuan1, WU Tingting1, ZHAO Kele1   

  1. 1. College of Energy, Chengdu University of Technology, Chengdu 610059 China;
    2. Xinjiang Keli New Technology Development Company Limited, Karamay 834000, Xinjiang, China
  • Received:2017-12-05 Revised:2018-02-27 Online:2018-05-21 Published:2018-05-21

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Abstract: The composition of shale is complicated and the pore structure is diverse,which results in great difference in adsorption properties of shale. The adsorption isotherm curves of different rock samples in the same reservoir vary greatly. Thus,we need to establish a standard adsorption isotherm curves for shale. The adsorption isothermal experiments of shale samples from Chang 7 reservoir in Ordos Basin were carried out by low temperature liquid nitrogen method. The experimental curves were initially standardized and then classified according to the C value of the BET theory,taking the exponent of 2 as the standardized value. Then,the standard adsorption isothermal curve of all samples was used to fit the parameters of the four adsorption layer thickness equations in Matlab numerical analysis software to verify the adsorption isothermal curve. The fitting accuracy of the four adsorption layer thickness equations is:Carbon Black,square < Carbon Black,cube < Halsey < De Bore. Finally,the standard adsorption isothermal curves of each type of shale were obtained by parameter averaging. The standard of adsorption isothermal curve of shale reservoir,which stand a series of adsorption characteristics of reservoirs with similar surface properties,can be calculated directly in reservoir simulation and reservoir engineering use, reduce the data uncertainly caused by random selection of rock samples,simplify a lot of calculation process, and make the calculation result is representative.

CLC Number: 

  • TE348
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