基于精确划分地层边界的三维地质体模型构建

Construction of a 3D geological model based on theaccurate division of stratigraphic boundaries

为解决人机交互建模只是定性考虑地层缺失的影响,且存在成本高、周期长、模型无法更新、大面积快速构建模型时精度要求高、以及自动建模未考虑地层缺失的影响从而导致模型精度低的问题。针对以上问题,在当前自动建模技术的基础上,采用离散化的薄板样条函数法插值,精确合理生成地层厚度DEM确定地层边界,定量分析地层形态,构建多要素复杂三维地质体模型。以广州1 500 km2边界范围为例进行实效性验证,经实际钻孔数据对比,三维地质体模型合理、准确,极大地提高了大面积建模效率,大幅减少了建模时间和成本,且利于模型的快速更新。

Numerous problems are encountered in human-computer interaction modeling.This modeling only qualitatively considers the impact of stratum loss and demonstrates its high cost and long cycle.Moreover,human-computer interaction modeling fails to update the model and quickly build high-precision models in a large area.Automatic modeling disregards the influence of stratum loss.Therefore,the interpolation is still conducted in the area with no target layer,which expands the distribution range of the target layer and causes low model accuracy.First,the discrete thin plate spline function method was used in this paper for interpolation based on the current automatic modeling technology.Then,the stratum thickness DEM was accurately and reasonably generated to determine the formation boundary and analyze the stratum form quantitatively.Finally,a complex 3D geological model for the main urban area of Guangzhou City(1500 km 2)was automatically constructed.The actual drilling proves the reasonability and accuracy of the model.The proposed modeling method can markedly improve the efficiency of large-area modeling and reduce the modeling time and cost,which is conducive to the rapid update of the model.