综合录井井下三维地层可视化建模研究与实现

摘要

After analyzing the characteristics of underground stratum, DEM model is selected to describe underground multilayer geological environment. Fisrtly, three-dimensional coordinate is projected and tranformed to two-dimensional coordinate system, two-dimensional Delaunay triangulation improved algorithm is designed to construct the Delaunay triangle net Then, the tranformation of triangulated irregular network (TIN) to the grid and how to build three-dimensional geological grid DEM are discussed, and a detailed description of how to draw the 3D-Stratum by the OPENGL is given. Moreover, the method of generating geological cross-secton is proposed by the cutting plane equation. Finally, a prototype system with a simple structure, small amounts of data, strong expansion is developed Experimental results show that the platform can observe and analyze the cutted 3D geological body from any angle , and zoom , cut the whole 3D geological body from any angle.%针对综合录井井下地层特点,采用多层DEM三维可视化模型对地下地质环境进行三维描述,实现综合录井三维地层实时显示.将三维坐标投影转换到二维坐标系中,采用二维Delaunay剖分改进算法构建Delaunay三角网；探讨了剖分后的不规则三角网(TIN)到格网的转换和插值以及通过格网DEM构建三维地层；介绍了根据选择的剖切面方程生成地质体的剖面.系统采用VC++6.0和OPENGL图形接口作为开发平台,可以从任意的角度对剖切开的三维地质体进行观察和分析也能够从任意的角度对三维地质体整体进行观察、缩放和剖切等操作.