Experimental and modeling study of the interaction between a crushed marl caprock and CO2-rich solutions under different pressure and temperature conditions

Carbon storage is regarded as a potential technology to reduce CO2 emissions. This study is concerned with CO2 storage in a reservoir rock (limestone) which is a deep saline aquifer containing a NaCl− and sulfate-rich groundwater in equilibrium with calcite and gypsum. The reservoir rock is overlain by a very low permeability formation (marls), which acts as a caprock. During and after CO2 injection, the resulting CO2-rich acid solution gave...