High⁃Pressure Adsorption Model for Middle-Deep and Deep Shale Gas

被引：0
作者：
Ren W. [1 ]
Zhou Y. [1 ]
Guo J. [1 ]
Wang T. [2 ]
机构：
[1] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu
[2] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2022年 / 47卷 / 05期
关键词：
Adsorption energy; Adsorption entropy change; Adsorption model; High pressure adsorption; Petroleum geology; Shale gas;
D O I：
10.3799/dqkx.2022.014
中图分类号：
学科分类号：
摘要：
The development depth is mostly greater than 2 000 m in major shale gas producing areas of China. As burial depth increases, reservoir pressure increases. The experimental and theoretical study of shale gas adsorption under low pressure is not suitable for the development of medium-deep and deep shale gas reservoirs. Thus, it modified the Uniform Langmuir model, and developed a high⁃pressure methane adsorption model, i.e., the modified Uniform Langmuir(Unilan)model. Then, we used the published experimental data under high pressure to validate the modified Unilan model. Moreover, we compared the modified Unilan model with other high⁃pressure adsorption models. It is found that the modified Unilan model with less fitting parameters is characterized by high precision, compared with other high pressure adsorption models. Finally, we investigated the fitted model parameters based on the mineral composition of the used shale samples. It is found that the adsorption capacity of shale is mainly controlled by organic matter and clay. Moreover, the volume of the adsorbed phase at maximum adsorption capacity is greater than micropore volume, but is less than total pore volume. Adsorption entropy change is mainly controlled by the interaction strength between adsorbed methane molecules and shale. © 2022, Editorial Department of Earth Science. All right reserved.
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页码：1865 / 1875
页数：10
相关论文
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