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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。
It is an important method for 3D geological modeling to reconstruct the geological model by using the exploration line profile and drilling and other data. The conversion of exploration profile from two-dimensional coordinate system to three-dimensional coordinate system is an important part of 3D modeling. In view of the characteristics that the drilling holes on the exploration line are not always arranged in a straight line (bending exploration line) during the coordinate transformation of the current exploration profile, a method of constructing the three-dimensional bending profile is proposed. In this method, a 3D fracture exploration profile framework is first constructed from the start point and the end point of the section line and the hole point on the exploration line as the turning point. Then the 2D coordinates of the section points on the 2D section are converted into three-dimensional space , And adding turning control points to the long sides across the turning point of the profile. Finally, taking the two-dimensional exploration profile data of a coalfield exploration area in Qinghai Province as an example, the profile of the two-dimensional exploration line is realized through the coordinate transformation algorithm of the exploration profile The results show that the geometry of the geological model expressed by the original two-dimensional profile is maintained on the three-dimensional profile.