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Carbon isotope fractionation during shale gas release: Experimental results and molecular modeling of mechanisms

文献类型：期刊论文

作者Liu, Yu4; Liang, Feng1,5; Shang, Fuhua2; Wang, Yang3; Zhang, Qin1,5; Shen, Zhen4; Su, Chi6
刊名GAS SCIENCE AND ENGINEERING
出版日期2023-05-01
卷号113页码:11
关键词Carbon isotope fractionation Shale gas Molecular simulation Gas transport
ISSN号2949-9097
DOI10.1016/j.jgsce.2023.204962
英文摘要Carbon isotope fractionation during the release of gas from shales is a potential tool to evaluate the remaining gas content. However, the mechanism of carbon isotope fractionation during this process is still unclear. In this study, the delta 13CH4 ratios of gases desorbed from two shale samples over a period of 800 min were analyzed. The results show that during gas release, the delta 13CH4 values change in four stages: firstly decreasing from-27%o to-31%o; then increasing significantly from-31%o to-23%o. Subsequently, they decrease, and then finally in-crease slightly. Molecular simulations were also employed to calculate the adsorption and transport of 12CH4 and 13CH4. Based on simulation results, the adsorption amount, adsorption energy and density of 13CH4 are very similar to those of 12CH4. However, the molecular simulation showed significant differences in the transport of 13CH4 and 12CH4. By integrating the experimental and simulation results, a molecular mechanism for carbon isotope fraction is proposed. In Stage 1, gas expelled from the shale is mainly stored in fractures and macropores, and without the interaction of the gas with pore walls, 13CH4 is transported more slowly than 12CH4. In Stage 2, the high-pressure gas initially stored in micropores is expelled from the shale. The 13CH4 is transported more quickly in the small nanopores than 12CH4 when pressure is > 1 MPa, and the delta 13C values increase corre-spondingly. In Stage 3, the gas pressure in the whole pore system is relatively low, and 13CH4 is transported more slowly than 12CH4 when migrating through small micropores. As a result, delta 13C values show a slight decrease. In the last stage, since relatively more 13CH4 molecules remain in shale, the delta 13CH4 values increase slightly again.
WOS关键词PORE STRUCTURE ; METHANE ADSORPTION ; TRANSPORT ; NANOPORES ; DIFFUSION
资助项目Beijing Natural Science Foundation[8222071] ; National Natural Science Foundation of China[42172156] ; Fundamental Research Funds for the Central Universities[2022YQDC07]
WOS研究方向Energy & Fuels ; Engineering
语种英语
WOS记录号WOS:001002345200001
出版者ELSEVIER
资助机构Beijing Natural Science Foundation ; Beijing Natural Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Beijing Natural Science Foundation ; Beijing Natural Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Beijing Natural Science Foundation ; Beijing Natural Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Beijing Natural Science Foundation ; Beijing Natural Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities
源URL[http://ir.iggcas.ac.cn/handle/132A11/110970]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Liu, Yu; Liang, Feng
作者单位1.PetroChina Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
2.Inner Mongolia Univ Technol, Sch Mines, Hohhot 010051, Inner Mongolia, Peoples R China
3.China Univ Min & Technol, Key Lab Coalbed Methane Resources & Reservoir Form, Minist Educ, Xuzhou 221008, Peoples R China
4.China Univ Min & Technol, Coll Geosci & Survey Engn, Beijing 100083, Peoples R China
5.Natl Energy Shale Gas R&D Expt Ctr, Langfang 065007, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Yu,Liang, Feng,Shang, Fuhua,et al. Carbon isotope fractionation during shale gas release: Experimental results and molecular modeling of mechanisms[J]. GAS SCIENCE AND ENGINEERING,2023,113:11.
APA Liu, Yu.,Liang, Feng.,Shang, Fuhua.,Wang, Yang.,Zhang, Qin.,...&Su, Chi.(2023).Carbon isotope fractionation during shale gas release: Experimental results and molecular modeling of mechanisms.GAS SCIENCE AND ENGINEERING,113,11.
MLA Liu, Yu,et al."Carbon isotope fractionation during shale gas release: Experimental results and molecular modeling of mechanisms".GAS SCIENCE AND ENGINEERING 113(2023):11.

入库方式： OAI收割

来源：地质与地球物理研究所

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