关键词: 地质块体建模, 四面体剖分, 并行, 分治合并

Abstract: Aiming at the disadvantages of large memory consumption and low execute efficiency in traditional geological modeling method, a new parallel 3D geological block modeling method based on unstructured tetrahedron is presented. The method makes full use of the principle of ‘divide and conquer’. Firstly, scatters of geologic layers are recombined and separated into several independent closed blocks. Secondly, these blocks are tetrahedrally partitioned through several procedures including triangulation of surface scatters of blocks and constraint tetrahedrization, and so on. Finally, these resulting meshes of blocks are merged together to form the final whole model with unstructured tetrahedron meshes. Multi-process parallel technique is applied to the second step which deal with separated blocks to improve execution efficiency and reduce memory requirements, and that is why this method can be applied to modeling of large-scale geological bodies. This method can generate applicable model data for seismic forward simulation and migration algorithms which refer to numerical method based on unstructured meshes, for example, finite volume method and finite element method.

Key words: geological block modeling, tetrahedralization, parallel, divide and conquer