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A better understanding of the brine-rock- supercritical CO2 interaction is needed to evaluate the risks of geologic CO2 sequestration. The geochemical effects of brine and supercritical CO2 were examined via laboratory modeling of in situ conditions on two reservoir caprocks in the Black Warrior River Basin, the Pottsville and Parkwood Formations. The clay fraction was extracted and treated at ~ 100 bar and 363 K (90 øC) over periods of up to 70 hours. Supercritical CO2 was introduced as drydoi:10.57709/3228829 fatcat:kaugmuiubrgnheiiv2asvhsx6q