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Shale gas is a promising energy source offering additional energy security over concerns of fossil fuel depletion. Injecting CO 2 into depleted shale gas reservoirs might provide a feasible solution for CO 2 storage and enhanced gas recovery. However, shale strain caused by the CO 2 injection as well as CO 2 sequestration in the reservoir needs to be considered during shale gas production. For this purpose, this paper examines the adsorption capacities, CO 2 -induced swelling, and He-induced strain of shales at 0-16 MPa and 35-75 °C. The maximum excess adsorption at different temperatures correlated with the bulk phase density: as the CO 2 temperature increased, the maximum excess adsorption density decreased. The density of the adsorbed phase, obtained using the Dubinin-Radushkevich model, was used to fit the excess adsorption data. At low pressure, the CO 2 -induced strain on shale was caused by the gas adsorption, whereas at high pressure, it was caused by gas pressure. The absolute adsorption linearly correlated with the adsorption-induced strain.

Swelling of Shales by Supercritical Carbon Dioxide and Its Relationship to Sorption