基于实际材料图的三维断层模型动态构建方法

A dynamic method for modeling faults in 3D based on primitive data map

三维地质模型是地质调查信息表达从传统二维平面向三维空间转变的一次重大突破。中国正在开展的三维地质填图作为国家的重要基础地质调查工作部署,将调查与研究相结合,在推动三维地质建模从研究走向实践具有重大意义。三维地质填图过程中如何准确、快速地构建三维断层模型是其中的关键点及难点。通过对数字填图过程不同阶段数据源的分析,详细分析了实际材料图建立断层数据以及与野外路线数据的关系映射规则,提出并实现了由线及面的断层模型构建方法。该方法强调断层模型构建与业务流程的一致性、动态性和快速性,构建模型的数据源始于野外第一手资料,充分利用填图业务过程中不同阶段数据的关联、约束与继承关系,能够满足在填图过程中根据地质认识的深入快速、动态地重构模型的要求,同时也可根据直观的三维断层模型时时验证地质连图的合理性。算法已在实际野外三维地质填图工作进行了多次实验,获得较好的成果。实验说明,基于实际材料图的三维断层模型构建方法与实际业务过程同步,具有操作便捷性,可直接应用于三维地质填图的实际工作要求。

3D geological model is the major breakthrough of transition from traditional 2D to 3D space for the expression of geological survey information. At present, 3D geological mapping in China is being carried out as an important basis for deployment of geological survey work. During the process, combining the investigation and research is of great significance promoting the conversion of 3D geological modeling from research to practice. How to accurately and quickly build 3D faults model is one of the key points and difficulties. Through analyzing the data source at different stages of digital mapping and using relationship mapping rules between faults data and field data about the primitive data map, the 3D faults modeling method from line to surface is proposed and implemented. This method emphasizes that the faults modeling process is coincident, dynamic and fast. The data used in the building model come from the first hand field data. The method makes full use of the association, constraints and inheritance relationships at different stages of mapping, which can meet the requirements of rapid and dynamic rebuilding of model by the progress of geological understanding in the mapping process, and can also verify the rationality of connecting boundaries constantly. The algorithm was tested with several field experiments in the actual 3D geological mapping, with satisfactory results achieved. Experiment shows that the 3D＆amp;nbsp;fault modeling method based on primitive data map synchronizes with the actual business process, operates conveniently and can satisfy the practical requirements of 3D geological mapping.