城市地质调查中知识驱动的多尺度三维地质体模型构建方法

Knowledge-Driven Multiple Scale 3D Geological Modeling Method in Urban Geological Survey

在城市地质三维模型构建中,数据来源庞杂,且不同应用领域对模型精度的要求不同。当前地质体三维模型构建技术还无法很好地支持大范围复杂地质结构模型的快速构建,建模过程繁杂,并影响后续地质分析工作的开展。为了解决这一问题,该文面向三维城市地质调查工作,提出了一种知识驱动的多尺度三维地质体模型快速构建方法。以专家知识为指导,通过对研究区域进行盆地分析和古沉积环境分析,建立了研究区域内符合城市地质要求的沉积地层分层标准,摸清了时代内沉积相和沉积微相的空间分布。在此基础上,融合多源多类地质数据,运用Kriging插值、多约束条件Delaunay三角剖分与局部拓扑重构技术,详细探讨了从钻孔与剖面数据→地层格架面→三维地质体模型的快速构建过程。该方法已在中国地质调查局试点项目"闽江口地区地质环境调查"项目中得到应用,并集成在QuantyView3D系列地矿应用软件中。

3Durban geological survey has been a major part of the work of China Geological Survey in recent years.In the process of 3Durban geological modeling,the data are enormous and complex while the different application area require different precision.At present,3Dgeological modeling technology cannot well support the rapid modeling of complex geological structure,leading to the intricate modeling process and influencing the further geological analysis.In order to solve this problem,this paper proposes a rapid knowledge-driven multiple scale 3Dgeological modeling method according to 3Durban geological survey.Instructed by expert knowledge,the analysis of basin and sedimentary environment in the study area helps to build up the division standard of sedimentary stratum conforming to the urban geological requirement.Thereupon,agood knowledge of spatial distribution of sedimentary facies and sedimentary micro facies is obtained in the different geologic age.Based on the work above,the paper uses Kriging interpolation,multi-constraints Delaunay triangulation and surface topological reconstruction technology,to discuss the rapid modeling process adequately.This method has been applied in a pilot project ＂Investigation of Urban Geological Environment in Minjiang Port Area＂ which is launched by Geological Survey of China and it has been integrated in the QuantyView3 Dseries application software in the geological and mineral field.These also show the availability and robustness of the proposed method.