基于IDL的地质体真三维重构与可视化探讨--以福州市地热田热储结构为例

地质构造三维可视化可以将地质勘探数据用直观的图形方式显示,是正确认识地质构造和理解地热田区域透水层分布重要手段,从而为地热开发利用提供科学依据。本文应用不规则三角网(TIN)表面法和克里格(kriging)算法,对已知钻孔数据进行三角剖分和插值,构建三维体数据,从而实现地质三维重构。基于IDL开发环境,采用光线投射法和zbuffer相结合的直接体绘制算法,实现地质三维分析和可视化。并以福州市地热田热储结构为例,实现了地质真三维交互式切割分析、显示和查询。

Three-dimensional reconstruction and visualization of geological material with IDL

Three dimensional visualization of geology constructed-model is used to display the exploration data graphically,which is an important means to learn the geo-body structure and understanding the distribution of permeable zones in geothermal fields,and provide useful information for exploration and assessment of reservoirs.Based on the triangulation (Delaunay) and Kriging interpolation,the geological layer and triangular grid are constructed.According to grid data structure,3D data are generated.Direct Volume Rendering is employed,which combines ray_casting with zbuffer arithmetic.Visualization is realized with programmable data analysis and visualization environment IDL. At the same time,the authors have developed three-dimension visualization system of Fuzhou geothermal Field with interactive incision,analysis and query.