基于三维剖面的复杂地质体显式自动建模方法研究

Research on Explicit Automatic Modeling Method of Complex Geological Body Based on Three-dimensional Profile

本文提出了一种以三维地质剖面为基础数据,结合地表地形、断层、地质图等数据强约束,实现复杂地质体显式自动建模的方法。该方法支持对断层交错、褶皱、侵入岩、火山通道等可能造成水平地层单元破碎、垂向多解和倒序的复杂地质构造的处理和构建,并能通过数据属性参数调整,在一定程度上实现对建模结果的人工干预。本文详细介绍了该方法的建模过程,包括建模数据准备及处理、构建断层分段面、构建框架(一级)地层模型、构建精细(二级)地层模型,并重点介绍了该建模方法解决的难点问题。应用该方法,采用平行剖面分块方法,将广东省陆域范围分割成条带状区域,然后以每个条带状区域为初始建模单元进行三维地质建模,最后将各条带三维模型无缝拼接,首次得到整个广东省1∶25万基岩三维模型。该方法能够为大范围复杂地质体快速建模提供借鉴。

This paper presents an explicit automatic modeling method for complex geological bodies based on 3D geological profile data and combined with strong constraints of surface topography,faults,geological maps and other data.This method supports the processing and construction of complex geological structures that may cause horizontal stratigraphic unit breakage,vertical multiple solutions and inversion,such as fault interlacing,folds,intrusive rocks,volcanic channels,etc.,and can achieve human intervention on modeling results to a certain extent through the adjustment of data attribute parameters.The modeling process of this method is introduced in detail,including the preparation and processing of modeling data,the construction of fault segmentation plane,the construction of framework(primary)stratum model,and the construction of fine(secondary)stratum model.The difficult problems solved by this modeling method are highlighted.The land area of Guangdong Province is divided into strip areas by using this method together with the parallel profile dividing method,and then 3D geological modeling is carried out in each strip area which is regards as the initial modeling unit,Finally,the 3D geological models of each strip are seamlessly spliced,and the 1:250000 bedrock 3D model of the whole Guangdong Province is obtained for the first time.This method can provide a reference for rapid modeling of large-scale complex geological bodies.