勘探线剖面图从二维转化为三维算法

Research on prospecting line profile map from 2D to 3D

用勘探线剖面图结合钻井与其他资料进行地质模型三维重建是三维地质建模的重要方法。其中勘探线剖面图从二维坐标系向三维坐标系的转换是三维建模的一个重要环节。针对当前勘探线剖面坐标转换过程中勘探线上钻孔并不总是布置在一条直线上(弯折勘探线)的特点,该文提出了一种构建弯折三维剖面的方法。该方法首先由剖面线的起点、终点以及勘探线上钻孔孔口点作为转折点构建三维折勘探线剖面框架;然后将二维剖面图上分段转换剖面上要素点的二维坐标到三维空间,并对跨越剖面转折点的长边添加转折控制点;最后以青海某煤田勘探区的二维勘探线剖面图数据为例,利用该勘探线剖面坐标转换算法,实现了二维勘探线剖面图到三维勘探线剖面图的转化,结果表明三维剖面上保持了原二维剖面所表达的地质模型的几何形态。

Line profile map prospecting from 2D to 3D coordinate system is an important part of 3D modeling. As the drills on the prospecting line are not arranged in a straight line （bending prospecting line）, this paper proposed a method for constructing 3D bending profile. Firstly, regarding the beginning, ending and drill points of the prospecting line as turning points were used to build 3D folded upright profile frame. Then, 2D points of features on 2D profilewere converted into 3D points on 3D profile section by section, and adding turning control points for the long line crossover two segments. Finally, the paper used 2D prospecting line profile of a coal exploration area of Qinghai as the text data, making use of the process and key algorithm of prospecting line profile coordination transformation, and achieving 2D pros- pecting line profile into 3D prospecting line profile. The results showed that the 3D profile kept the geometic morphology of geological model expressed by the original 2D profile.