一种三维结构建模中的地层厚度控制算法

在三维结构建模中,构建地层面时常常因不符合真实地质情况的插值点出现而产生不合理的层面厚度.针对这一问题,提出一种厚度控制算法.首先对不规则三角网建立空间索引和OBB碰撞模型,在此基础上进行相交测试找出不合理厚度位置,然后采用拓扑学中几何图形剖分的思想,在0维和1维上进行厚度调整.该方法已在石油、矿山领域成功运用,应用结果表明本文算法求解速度快、运行稳定、结果可靠,能自动有效地控制层面厚度,避免了大量人工交互的厚度调整操作.

A Stratigraphic Thickness Control Algorithm in 3D Structural Modeling

In 3D stuctural modeling， during construction of the stratigraphic surface， unreasonable stratigraphic thickness often arises by the interpolation point that is not consistent with the actual geological conditions. To address this problem， a new method for the thickness control is proposed. Firstly， a model of spatial index and OBB collision for triangulated irregular network is established. Secondly， according to the model， the position of the layer with unreasonable thickness is found out by intersection test. Thirdly， with the thought of geometry subdivision in topology， the thickness control is performed on zero and one dimensions. This method has been successfully applied in petroleum and mine field. The results show that the algorithm is fast， stable and reliable. It can be used to control the thickness of the layer automatically， avoiding massive manual interaction operations of thickness adjustment.