The reservoir characteristics of shale is introduced.The role and advantages of supercritical CO2 in enhanced shale gas extraction technology are analyzed from the aspects of the fluid seepage mechanism at different scales,CO2/CH4 competitive adsorption principle and CO2-water-shale interaction mechanism in shale.The supercritical CO2 enhanced shale gas extraction technology faces challenges in terms of development economics,core technology mechanism and safety assessment of leakage risk monitoring and long-term storage.
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