分块区域三维地质建模方法

区域三维地质建模是区域三维地质调查的关键。在大量反复实践的基础上，提出了分块三维地质建模方法，该方法的主要步骤为：以断裂、岩体边界和不整合等为边界，把复杂的三维地质建模区域分解为内部构造相对简单的建模块或建模地质单元；分别对各建模块进行地质地球物理综合研究，编制深部地质剖面，揭示深部地质结构；采用基于剖面的建模方法按照全区统一的坐标系统构建三维地质模型；在完成全区所有建模块三维地质模型构建之后，把各个建模块的三维地质模型集成在统一的三维空间框架下，形成全区的三维地质模型。该方法具有能够简化三维地质建模过程、易于修改完善模型、易于集成模型等优势，能够克服常规的基于剖面的三维地质建模方法中存在的问题，突破了大规模区域三维地质建模的瓶颈。在本溪-临江深部地质调查中的应用表明，采用该方法可以有效构建研究区的三维地质模型，并能充分表达复杂的地下深部地质结构，为开展复杂地区大规模区域三维地质建模提供了一个重要途径。

A Method of Block-Divided 3D Geologic Modeling in Regional Scale

3D geological modeling in regional scale is the key to regional 3D geological survey. On the basis of a large number of practices, we have put forward the method of block-divided 3D geological modeling. The steps of the method include: dividing complex 3D model-building region into simple model-building blocks or model-building units, conducting geological and geophysical comprehensive researches and drawing geological cross sections and revealing deep geological structures in every model-building block, constructing 3D geological model for every model-building block with unified coordinate system by the model-building method based on cross section, and creating 3D model for whole region by integrating the model of every model-building block into unified 3D space framework after all models have been constructed in study region. There are three advantages for the method, which is easy to simplify the processes for constructing models, easy to modify models and easy to integrate models. The method able to overcome the problems of general 3D geological modeling method based on the cross section, and to break the bottleneck for large scale regional 3D geological modeling. The application of the method to deep geological survey in Benxi-Linjiang area has showed the method can effectively construct a 3D geological model of the study area, can fully depict complex deep underground geological structures, and provide an important way for constructing 3D model in a large complex region.