Abstract:

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.

Key words: block-divided modeling, synthesis constraints, integrated assembly, IGeoMod, 3D geologic modeling