Microbial CaCO3 mineral formation and stability in an experimentally simulated high pressure saline aquifer with supercritical CO2

► Microbiologically induced mineralization for CO2 leakage reduction is investigated. ► Ureolysis can induce CaCO3 mineralization under simulated reservoir conditions. ► CaCO3 is resilient to dry scCO2, water-saturated scCO2, and atmospheric pressure brine. ► scCO2-saturated brine caused CaCO3 mass loss due to advection during depressurization.