3D reservoir geological modeling is an advanced reservoir description method that runs through oil and gas field exploration and development. The three-dimensional model characterizes the reservoir's geometric shape and heterogeneous reservoir property and plays an increasingly important role in determining the reservoir distribution, internal configuration, and reservoir quality. Geostatistics is an essential tool for reservoir description and modeling. A precise and accurate 3D reservoir model is significant for oil and gas exploration and development. After years of development, reservoir geological modeling technology has changed from direct conversion of geological data to two-point geostatistics driven by variogram to multipoint geostatistics. The three-dimensional geological model can indicate the spatial distribution direction and development of sand bodies; Guided by the stochastic modeling theory and variogram model theory, the 3D geological model establishes the physical property model of the reservoir under the control of the facies control model. This method can provide essential geological data for numerical simulation research, guide the distribution of remaining oil, and formulate development plans.