Abstract: 3D geological modeling technology is applied more and more widely in the process of oil and gas exploration and development. Pillar grid provides a method which can describe reservoir fluid flow, as the basic structure of 3D geological volume has been applied in existing 3D geological modeling software. The surface model of 3D geological volume can display geological tectonics more intuitively, so the surface model extraction algorithm of 3D geologic volume based on pillar grid has great utility value in geologic modeling. This paper proposes a surface extraction algorithm by parsing 3D geological data based on pillar grid, which puts forward its surface model and visualization. This algorithm mainly implements the surface extraction of complex 3D geological volume based on pillar grid, including the surface extraction method of 3D modeling without faults and the surface extraction method of 3D modeling with complex faults. Through the actual data validation, this algorithm can implement surface model extraction of complex 3D geological volume, meeting practical requirements and value.

Key words: complex geologic volume, fault location estimation, surface model extraction

摘要： 在油气勘探开发过程中，三维地质建模技术应用越来越广泛。pillar grid是目前主流三维地质建模软件应用的结构化网格，提供储层流体流动的描述方法。如何更加直观地展示地质体构造形态，将地质体网格数据中三维地质体表面模型提取出来在地质建模中具有较高的应用价值。因此，提出一种三维地质体表面提取算法，对基于pillar grid三维地质体数据进行解析，提出其表面模型来辅助计算机可视化展示。该算法主要包含基于pillar grid无断层三维地质体表面模型提取算法和带有复杂断层三维地质体表面模型提取算法两部分。通过实际的三维地质体模型数据进行算法验证，证实该算法能够较好地实现基于pillar grid复杂三维地质体表面模型提取功能，满足实际需求，具有应用价值。

关键词: 复杂地质体, 断层位置判断, 表面模型提取