Determination of lithology and identification of geological facies is of high importance in studying hydrocarbon reservoirs. Seismic reflection methods with seismic attributes are a powerful tool for geological facies segregation. When the compressional wave impact vertical to the contact surface of the layers, the compressional wave is not converted to shear wave. in post-stack inversion, only compressional wave information is obtained. In addition to P-Impedance, S-Impedance and density information can also be extracted from pre-stack simultaneous inversion. In this study, pre-stack seismic data with well data were used to identify the geological facies of the reservoir area. Based on the inversion results, on the one hand, the reservoir boundary is separated and on the other, four facies are separated in the reservoir boundary. The results are consistent with well data in the reservoir area.