Unconventional oil recovery from Al Sultani tight rock formations using supercritical CO2

•Solid phase with high porosity but low permeability.•Diffusion dominated extraction kinetics.•Decreasing IFT to 2 mN/m above 10 MPa.•Wettability alteration from water wet to non-water wet at elevated pressures.•Storage capacity of more than 3 wt% at moderate pressures.