Three-dimensional geological modeling realizes the digital expression of underground geological structure through geometric structure reduction, topological relationship analysis and parameter information integration, which provides a visual tool for quantitative research of earth science and improves the accuracy of reservoir description. By integrating multi-dimensional data such as geology and logging, a comprehensive digital twin including lithologic parameters and physical parameters is established to realize data cross-verification. According to the research results of sand body and physical properties of Shanxi Formation, a three-dimensional geological model is established. Based on the comprehensive evaluation of single well and the comparative analysis of connected wells, the facies model is established. Under the guidance of facies controlled modeling technology, the reservoir attribute model is established. The geological model generated based on geostatistics technology can represent the spatial heterogeneity of reservoir parameters, significantly improve the analysis accuracy of sand-mud ratio and lithofacies distribution of complex oil and gas reservoirs, provide reliable basis for accurate evaluation of reservoir characteristics, and also provide geological basis for gas reservoir development.