Abstract: Analysis based on the complex 3D geological model is becoming more and more important during the process of the secondary development of old oilfield. The construction of the complex three-dimensional geological model is also a key point. The paper first analyzes the realistic demand of practical application, and chooses the corner grid of the geological model as the breakthrough point. And then it introduces the related definition and characteristic of corner point grid. Furthermore, according to the existing studies mainly concentrated on the dividing of the corner grid, it puts forward a new method of extracting the fault, horizon and surface of the complex geological body based on corner grid. And then it introduces the process in detail. In the end, combined with sample and the actual data, the method is verified efficiently in the process of modeling and visualization of complex geological model.

Key words: corner grid, fault extraction, horizon extraction, surface of complex geological model

摘要： 在低渗透、老油田的二次开发过程中，基于三维地质模型的综合分析、设计越来越重要。其中复杂三维地质模型的构建也是重难点。分析了实际工程应用中的现实需求，并基于现有技术选择了基于角点网格的地质模型作为切入点，在介绍角点网格的相关定义与特点的基础上，针对现有关于角点网格的研究主要集中在对角点网格的划分方法上的现状，提出了一种新的对基于角点网格形式表示的复杂地质体提取其表面模型的方法，并详细介绍了算法思路及处理流程。通过多组样例数据及实际油田数据的验证，得到了所需的表面模型并且效率满足实际要求，提出的方法能有效提取基于角点网格的复杂地质体表面模型。

关键词: 角点网格, 断层提取, 分层提取, 复杂地质体表面模型