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

Petroleum Exploration and Development 2022年第5期49卷 1069-1084页

作者： LI Wenbiao LU Shuangfang LI Junqian WEI Yongbo ZHAO Shengxian ZHANG Pengfei WANG Ziyi LI Xiao WANG Jun Sanya Offshore Oil&Gas Research Institute Northeast Petroleum UniversitySanya 572025China Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development Ministry of EducationNortheast Petroleum UniversityDaqing 163318China School of Geosciences China University of Petroleum(East China)Qingdao 266580China Exploration and Development Research Institute of Daqing Oilfield Co.Ltd. Daqing 163712China Shale Gas Research Institute of PetroChina Southwest Oil&Gasfield Company Chengdu 610051China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

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/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.

关键词： shale gas coalbed methane diffusive fractionation adsorption/desorption fractionation isotope fractionation model natural gas migration

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