基于Voronoi图的三维地层自动建模方法

Automatic 3D stratigraphic modeling method based on Voronoi diagram

三维地质建模是一项学科交叉的研究内容,也是学界的研究热点。针对目前三维地质建模方法中建模效率差、自动化程度低以及对地层尖灭、夹层识别不足的问题,提出一种基于钻孔平面点集Voronoi图的三维地层自动建模方法。首先分析处理钻孔数据,按地层块体属性归类,而后通过平面连通性与高程连通性判定,确立基于Voronoi图的地层边界,最后将地层块体分为普通地层和夹层两种地层块体,分层构建地质模型。该方法在南京某地下工程中应用结果表明,文中建模适用于沉积地层的建模,能够较好地识别地层分布中常见的尖灭和夹层现象,实现,无需人工干预的自动化快速建模。

Three-dimensional (3D) geological modeling is an interdisciplinary research as well as a research hotspot. In this paper, a 3D stratum automatic modeling method based on Voronoi diagram of borehole planar point set is proposed in solving the problems of low modeling efficiency, low automation degree and lack of identification of stratum pinch and interlayers in current modeling method. The method firstly analyzes and processes the borehole data and classifies them according to the attributes of the stratigraphic blocks. Then the stratigraphical boundary is identified based on the Voronoi diagram through the determination of plane connectivity and elevation connectivity. Finally, the stratigraphic blocks are divided into two types, ordinary stratum and interlayer stratum respectively, with geologic model built for different strata. The method has been applied to an underground project of Nanjing, showing that it's suitable for the modeling of sedimentary strata and in a better position to identify the pinch and interlayer phenomena commonly seen in the strata distribution, realizing the rapid and automatic modeling without human intervention.