Measurements of CO₂ sorption on rocks using a volumetric technique for CO₂ geological storage

In order to predict CO₂ storage potential of candidate geological reservoirs, this study investigated the CO₂ sorption capacity of sandstone and granite under air-dry and water-saturated conditions using a volumetric technique, at temperatures of 33, 40, and 50 ^{{ring operator}}C and pressures up to 20 MPa. The sandstone and granite have the potential to sorb CO₂ under the both conditions. A comparison with model predictions (monolayer adsorption, solubility and pore-filling models) indicated that the sorption of CO₂ onto rock minerals offers an important mechanism for the CO₂-rock interactions which may take place in the course of CO₂ injection.