Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (1): 95-105.doi: 10.12108/yxyqc.20220110

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

New method of shale gas evaluation of Wufeng-Longmaxi Formation in Changning area, southern Sichuan Basin

WEN Kang1,2, YAN Jianping1,2,3, ZHONG Guanghai4, JING Cui5, TANG Hongming2, WANG Min6, WANG Jun6, HU Qinhong7, LI Zhipeng6   

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China;
    4. Research Institute of Shale gas, PetroChina Southwest Oil & Gas Field Company, Chengdu 610500, China;
    5. Sichuan Changning Natural Gas Development Company Limited, Chengdu 610051, China;
    6. Research Institute of Exploration and Development, Sinopec Shengli Oilfield Company, Dongying 257015, Shandong, China;
    7. Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, TX 76019, USA
  • Received:2021-05-12 Revised:2021-07-29 Online:2022-01-01 Published:2022-01-21

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Abstract: In order to evaluate the gas content of marine shale of Wufeng-Longmaxi Formation in Changning area,southern Sichuan Basin,the shale gas was divided into adsorbed gas and free gas and then calculated separately. Based on isothermal adsorption experimental data,a new adsorbed gas volume evaluation model was proposed and constructed based on micropore filling theory and D-A(Dubibin-Astakhov) equation. The key parameters affecting the adsorbed gas volume, such as formation pressure,total organic carbon(TOC) content and porosity, were taken into account in the calculation of the variable parameter V0 which is the maximum micropore adsorption capacity,the constant B related to the affinity of the adsorption system for gas,and the parameter t related to the surface heterogeneity of the adsorption system. Based on the gas saturation method and combined with the effect of adsorbed methane on pore volume,an evaluation model for quantitative correction of free gas volume was established. The results show that the newly established evaluation model of adsorbed gas and free gas volume has a good application effect in the evaluation of shale gas content in the study area,and the correlation coefficient between the calculated gas content and measured data is more than 0.90. The research results provide a basis for shale gas resource potential evaluation and sweet spot prediction.

Key words: shale gas content, adsorbed gas, free gas, isothermal adsorption, micropore filling theory, D-A equation

CLC Number: 

  • TE319
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