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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 the fine three-dimensional geological model is one of the difficult problems to realize the true three-dimensional visualization of geological body. This paper presents a method of constructing 3D fine geologic model based on mixed spatial data model of irregular triangle network (TIN) and corner grid (CPG). First, a TIN-based three-dimensional geological-structural model of tectonic-stratigraphic framework was established. Then, the transformation from TIN element model to CPG voxel model was performed, and the TIN-based structural-stratigraphic framework model was transformed into the CPG- , So as to realize the construction of fine three-dimensional geological model of “expression”. In the process of transformation, we must first define the sequence of stratigraphy, and then divide the space grid, then calculate the space coordinates of each cell in the grid and the validity of each grid, and store the result as GRDECL format File, and finally read the file through the QuantyView3D system to display the fine geological attribute model. The method is used to build a fine hydrogeological model in a key area of a coastal city, and the feasibility of the method is verified.