Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 171-179.doi: 10.12108/yxyqc.20210218

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Difference analysis of isosteric heat of methane adsorption on shale based on fugacity and pressure: a case study of Yanchang Formation in Yanchang exploration area

XUE Pei1,2, ZHANG Lixia2, LIANG Quansheng2, SHI Yi3   

  1. 1. Northwest University of Political Science and Law, Xi'an 710063, China;
    2. Research Institute, Shaanxi Yanchang Petroleum(Group) Co., Ltd., Xi'an 710075, China;
    3. Yanchang Petroleum Group Exploration Company, Yan'an 716000, Shaanxi, China
  • Received:2020-04-18 Revised:2020-06-05 Online:2021-04-01 Published:2021-03-31

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Abstract: In order to improve the calculation method of isosteric heat of adsorption,clarify the thermodynamic characteristics of adsorption of CH4 by continental shale and reveal its adsorption mechanism,shale samples from Yanchang Formation in Yanchang exploration area were selected to carry out isothermal adsorption experiment of CH4 adsorption on shale at different temperatures,and the difference of isosteric heat of adsorption based on fugacity-absolute adsorption capacity and pressure-absolute adsorption capacity was analyzed by using absolute adsorption capacity curve. The results show that:(1) Fugacity is less than pressure,and in the pressure range of 0.36-2.21 MPa,the difference between fugacity and pressure is small. With the temperature decreasing and the pressure increasing,the difference increases.(2) The isotherm curves based on fugacity and pressure have obvious monotonic increasing linear characteristics,but the slope of isosteric heat of adsorption curve obtained by pressure-absolute adsorption capacity is larger than that obtained by fugacity-absolute adsorption capacity,which indicates that the intermolecular force of adsorbate has a great influence on the calculation results of isosteric heat of adsorption based on pressure-absolute adsorption capacity.(3) In the absolute adsorption capacity range of 0.01-0.35 mmol/g,the relative deviation of isosteric heat of adsorption obtained based on fugacity-absolute adsorption capacity and pressure-absolute adsorption capacity is -86.54%-57.01%. The data of fugacityabsolute adsorption capacity should be used as the basic data for the calculation of isosteric heart of adsorption in the thermodynamic evaluation of shale gas adsorption system.

Key words: Clasius-Clayperon equation, fugacity, isosteric heat of adsorption, shale, Yanchang Formation

CLC Number: 

  • P618.11
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