Effect of sub-/super-critical CO2 and brine exposure on the mechanical and acoustic emission characteristics of shale

The effect of fluid-shale interaction on the mechanical behavior of shale is of great significance for the safety of long-term CO2 sequestration in shale formations. In this paper, uniaxial compression and Brazilian splitting tests were conducted to the examine the mechanical alterations of shale caused by various fluids (brine, subcritical CO2, supercritical CO2, subcritical CO2+brine and supercritical CO2+brine) soak. After soaking in various...