Abstract: In the exploration and development of oil and gas reservoirs，electrical differences is one of the most obvious features for reservoir identification，and the study of the complex resistivity characteris⁃ tics of oil-bearing rocks in reservoirs is important for quantitative evaluation of oil-bearing saturation. In this study，four samples of natural sandstone collected in the field were used as experimental materials.For these four rocks with different physical parameters (porosity，permeability，etc.)，oil-water repulsion experi⁃ ments were carried out under different oil saturation，and the complex resistivity amplitude-frequency and phase frequency curves of the four sandstone blocks were obtained respectively.The corresponding model parameters were obtained by inversion of Cole-Cole model，and the relationship between resistivity，polar⁃ ization and oil saturation of sandstone was obtained，which provides a reference for sandstone reservoir ex⁃ ploration and oil bearing evaluation.

Key words: sands reservoir, complex resistivity, polarizability, oil saturation