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Simulation of CO2 Storage and Enhanced Gas Recovery in Shale Gas Reservoirs Considering Adsorption Characteristics

In this study, we examined the performance of CO 2 injection techniques based on simulations in a conceptual shale reservoir to investigate the efficiency of CO 2 storage and enhanced gas recovery (CS-EGR). The developed conceptual model considers major shale reservoir characteristics in which the adsorption properties are the focus as a control parameter. For simple depletion cases, the production performance was directly dependent on the adsorption properties. However, in the CO 2 injection cases, the adsorption and desorption processes are more complicated and we did not identify remarkable increases in the recovery factor, but we observed a weak relationship with the Langmuir volume. The results of all CO 2 injection cases showed that the storage efficiency was more than 80%, indicating that shale reservoirs are a promising target for CO 2 storage. To increase the recovery factor and improve the optimum control of CS-EGR, other major shale reservoir properties and operational parameters should be simultaneously integrated.