精细三维地质模型的构建是实现地质体真三维可视化分析的难题之一。提出一种基于不规则三角网（TIN）和角点网格（CPG）的混合空间数据模型来构建三维精细地质模型的方法。首先建立基于TIN的构造-地层格架三维地质模型，然后进行TIN面元模型到CPG体元模型的转换，将基于TIN的构造-地层格架模型转换为基于CPG的精细网格体元地质模型，从而实现“表达上”精细三维地质模型的构建。在转换过程中首先要进行地层序列的定义，然后对空间格网进行划分，在此基础上计算格网中各个单元格的空间坐标和各个网格的有效性，并将计算结果存储为GRDECL格式文件，最后通过QuantyView3D系统读取该文件实现精细地质属性模型的展示。利用该方法对沿海某城市一个重点区域进行精细水文地质模型的构建，验证了其方法的可行性。

The construction of fine 3D geological modeling is one of challenges in realizing true 3D visualization of geological body. Based on Triangulate Irregular Network (TIN) and Corner Point Grid (CPG) spatial data model, we propose a hybrid spatial data model for constructing fine 3D geological model. Firstly, a tectonic-stratigraphic framework model is set up based on TIN. Then, the framework model is converted into fine volumetric 3D geological model based on CPG voxel data model, and thus the fine expression of inner space of 3D geological body is achieved. During the converting process, it is necessary to define the order of strata. The mesh of the geological body is further realized by calculating the spatial coordinate of each grid cell and validating and saving data file in GRDECL format. Finally, the fine geological model is displayed by inputting the file into QuantyView3D system. A fine 3D hydrogeological model of the key area of a coastal city is constructed successfully by using the proposed method, and the feasibility of this method is verified.