三维地质构造建模技术研究

Study of 3-D geological structure model building

（1.中国石油化工股份有限公司石油勘探开发研究院南京石油物探研究所，江苏南京210014；2.南京大学计算机科学系，江苏南京210093）

Institute of Geophysical Prospecting, Research Institute of Petroleum Exploration and Development, SINOPEC, Nanjing 210014, China

三维地质构造建模技术是三维地质建模中的关键技术，在油气资源勘探过程中发挥着越来越重大的作用。三维地质构造建模可以分为3个阶段：地质曲面重建、地质曲面拓扑关系分析和三维实体建模。地质曲面重建方面，在无约束条件地质曲面重建方法的基础上，提出了基于地质约束的地质曲面拟合技术，实现了拉张和挤压条件下的地质曲面重建；空间拓扑关系分析方面，提出了带有拓扑信息的交点排序与交线分离算法，能够处理复杂的地质边界和地质体之间的关系，得到的网格具有严格的拓扑一致和几何一致性；根据三维地质框架模型，提出了地层块体的分离算法，并以此为基础，结合地层沉积特征的定义，提出了三维地层网格的生成算法，实现了三维地质构造建模的全部流程。

3-D geological structure model building is the key technique for 3-D geological modeling and becomes more and more important in petroleum exploration. 3-D geological structure model building can be classified into geological curved surface reconstruction, topological analysis of geological curved surfaces, and solid modeling in 3-D space. In geological curved surface reconstruction, based on non-restraint geological surface reconstruction method, the geologic-constrained curved surface fitting technique was proposed to realize the construction of geologic surface in stretching and compressing conditions. In topology of geologic curved surfaces, crossing point sorting and intersection lines separation algorithm with topology information were proposed, which can process the complex relationship between geologic boundary and geologic bodies to achieve the grids with strict consistency in geometry and topology. After building 3-D geological framework model, the strata block abruption method was proposed. In addition, based on the definition of strata sedimentary characteristics, the algorithm of generating 3-D strata grids was put forward. Till now, the whole workflow for 3-D geologic structure model building was completed.