Research progress on isotopic fractionation in the process of shale gas/coalbed methane migration

被引：0
|
作者：
Li W. [1 ,2 ]
Lu S. [1 ,2 ,3 ]
Li J. [3 ]
Wei Y. [4 ]
Zhao S. [3 ,5 ]
Zhang P. [6 ]
Wang Z. [3 ]
Li X. [3 ]
Wang J. [3 ]
机构：
[1] Sanya Offshore Oil & Gas Research Institute, Northeast Petroleum University, Sanya
[2] Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, Daqing
[3] School of Geosciences, China University of Petroleum (East China), Qingdao
[4] Exploration and Development Research Institute, Daqing Oilfield Co. Ltd., Daqing
[5] Shale Gas Research Institute of PetroChina Southwest Oil & Gasfield Company, Chengdu
[6] College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao
来源：
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2022年 / 49卷 / 05期
关键词：
adsorption/desorption fractionation; coalbed methane; diffusive fractionation; isotope fractionation; natural gas migration; shale gas;
D O I：
10.11698/PED.20220225
中图分类号：
学科分类号：
摘要：
The research progress of isotopic fractionation in the process of shale gas/coalbed methane migration has been reviewed from three aspects: characteristics and influencing factors, mechanism and quantitative characterization model, and geological application. It is found that the isotopic fractionation during the complete production of shale gas/coalbed methane shows a four-stage characteristic of “stable-lighter-heavier-lighter again”, which is related to the complex gas migration modes in the pores of shale/coal. The gas migration mechanisms in shale/coal include seepage, diffusion, and adsorption/desorption. Among them, seepage driven by pressure difference does not induce isotopic fractionation, while diffusion and adsorption/desorption lead to significant isotope fractionation. The existing characterization models of isotopic fractionation include diffusion fractionation model, diffusion-adsorption/desorption coupled model, and multi-scale and multi-mechanism coupled model. Results of model calculations show that the isotopic fractionation during natural gas migration is mainly controlled by pore structure, adsorption capacity, and initial/boundary conditions of the reservoir rock. So far, the isotope fractionation model has been successfully used to evaluate critical parameters, such as gas-in-place content and ratio of adsorbed gas to free gas in shale/coal etc. Furthermore, it has shown promising application potential in production status identification and decline trend prediction of gas well. Future research should focus on: (1) the co-evolution of carbon and hydrogen isotopes of different components during natural gas migration, (2) the characterization of isotopic fractionation during the whole process of gas generation-expulsion-migration-accumulation-dispersion, and (3) quantitative characterization of isotopic fractionation during natural gas migration in complex pore-fracture systems and its application. © 2022 Science Press. All rights reserved.
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页码：929 / 942
页数：13
相关论文
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