Safe storage of Co2 together with improved oil recovery by Co2-enriched water injection

► In this study we investigate the potentials of carbonated (CO2-enriched) water injection as an injection strategy for enhancing oil recovery and CO2 storage. ► The results show that carbonated water loses its CO2 gradually in porous medium when it comes in contact with the oil. ► Dissolution of CO2 in the oil causes oil swelling and favourably changes the physical properties of the oil. ► Carbonated water injection improves oil recovery in both secondary and tertiary injection modes. ► A significant part of the CO2 injected as carbonated water is safely stored in the rock as a dissolved phase.