Mechanical Behavior of Sandstone Pressurized with Supercritical CO ₂ and Water under Different Confining Pressure Conditions

Understanding the mechanical behavior of a reservoir rock within the CO2-injection zone is essential for the safety of CO2 geological storage (CGS). The water saturation of the reservoir rock could be changed with the injection of huge amounts of supercritical CO2 (scCO2). Triaxial compression tests were performed on sandstone under dry, H2O-injected, scCO2-injected, and CO2–H2O biphasic conditions at effective confining pressures ranging from...