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Abstract. We prepared nanoporous graphene/silica nanohybrid and demonstrated its better Pickering emulsion properties for Chemical Enhanced Oil Recovery in comparison to the similar silica nanohybrid with a single-walled carbon nanotube. The samples were characterized with X-Ray Di raction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), and Thermal Gravimetry Analysis (TGA). Emulsion phase morphology was investigated with optical microscopic image. Evaluation results demonstrated that the best samples are 70% nanoporous graphene/SiO 2 (both methods) and 70% SWCNT/SiO 2 nanohybrid (Method 1). Contact angle measurement results showed that 70% nanoporous graphene/SiO 2 nanohybrid (Method 2) is more e ective in the improvement of the stone reservoir wettability alteration from oil-wet to water-wet. Interfacial tension results indicate that the maximum amount is related to the injection of water, and the minimum amount is related to the injection of nano uid of 70% nanoporous graphene/SiO 2 nanohybrid (Method 2). This result indicates the preference of 70% nanoporous graphene/SiO2 nanohybrid (Method 2) for decreasing the interfacial tension in comparison to the other samples.