三维地质界面网格模型构建算法研究

三维地质模型主要包含地质构造模型和地质属性模型。提出一种局部映射-边界控制的曲面三角化网格模型构建算法,与映射法相比,减少三维空间点映射到二维平面的计算过程,避免因多点到一点的映射关系而生成错误的三角化网格模型。基于地质测量数据特点,原始地质数据经处理后采用点集合形式表示,基于点集数据构建三维三角化网格模型,模拟地质界面的展布形态,控制三角网格质量。采用两种网格边界控制方法,在有边界约束数据和无边界约束数据条件下均能自动更新地质界面三角化网格模型边界。基于断层点数据集测试并展示算法构建的三维三角化网格模型可视化效果,通过断层面三角化网格模型能够反映断层面之间空间位置关系。

CONSTRUCTION ALGORITHM OF 3D GEOLOGICAL INTERFACE MESH MODEL

The 3D geological model mainly includes geological structure model and property model.This paper proposes a kind of generation algorithm of triangular mesh model by local mapping and boundary controlling.Compared with the mapping method,it reduces the calculation process of mapping a 3D point onto a 2D plane,and avoids generating a wrong triangular mesh model due to the mapping relationship between multiple points to one point.Based on the data characteristics of the geological measurement,the original geological data was expressed in the form of point set after processing.And a 3D triangular mesh model was constructed based on the point set data,which was used to simulate strata surfaces shape and generate high quality mesh.Two kinds of mesh boundary control methods were used to update the boundary of geological interface triangular mesh model automatically under the condition of boundary constraint data and without boundary constraint data.The data set of fault points is used to test and demonstrate the visualization effect of the generated mesh model.The triangular mesh models of fault surfaces can reflect the spatial position relationship between fault surfaces.