Critical investigation of zwitterionic surfactant for enhanced oil recovery from both sandstone and carbonate reservoirs: Adsorption, wettability alteration and imbibition studies

•Low adsorption of zwitterionic surfactant on both sandstone and carbonate rock.•Adsorption profile best fitted to Frumkin and Sips isotherm models.•Zwitterionic surfactant altered wettability of both sandstone and carbonate rock.•Salinity and alkalinity improved the wettability alteration by surfactant.•Oil recovery by imbibition proved effective wettability alteration by surfactant.