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Gas storage in shale pore system:A review of the mechanism,control and assessment

Petroleum Science 2023年第5期20卷 2605-2636页

作者： Yue Feng Xian-Ming Xiao En-Ze Wang Ping Gao Chen-Gang Lu Gang Li School of Energy Resources China University of Geosciences(Beijing)Beijing100083China School of Earth and Space Sciences Peking UniversityBeijing100871China

In the past 15 years,the shale gas revolution and large-scale commercial developments in the United States have driven the exploration and development of shale plays *** many factors affecting shale gas exploration potential,the gas-bearing properties of shale(quantity,storage state,composition)and their controlling factors are the essential research attracting wide attention in the academic *** paper reviews the research progress on the retention mechanism,influencing factors,and evaluation methods for resource potential of the shale gas system,and proposes further research *** is the main mechanism of gas retention in organic-rich shales;the gas is mainly stored in nanopores of shale in free and sorption *** presence of water and nonhydrocarbon gases in pores can complicate the process and mechanism of methane(CH4)sorption,and the related theoretical models still need further *** in-situ gas content and gasbearing properties of shale are governed by the geological properties(organic matter abundance,kerogen type,thermal maturity,mineral composition,diagenesis),the properties of fluids in pores(water,CH_(4),non-hydrocarbon gases),and geological conditions(temperature,pressure,preservation conditions)of the shale *** a particular basin or block,it is still challenging to define the main controlling factors,screen favorable exploration areas,and locate sweet *** to marine shales with extensive research and exploration data,lacustrine and marine-continental transitional shales are a further expanding area of *** methods have been developed to quantitatively characterize the in-situ gas content of shales,but all these methods have their own limitations,and more in-depth studies are needed to accurately evaluate and predict the in-situ gas content of shales,especially shales at deep depth.

关键词： Shale gas Retention mechanism multi-component adsorption Influencing factors Evaluation method

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