中文摘要：

文章针对大尺度研究区域勘探范围有限、不能直接基于勘探数据构建区域地质体三维结构模型的问题,提出了一种以平面地质图为研究对象的地质体三维建模方法。此方法以平面地质图为基础,利用Section软件在DEM模型（数字高程模型）约束下半自动绘制一系列图切剖面图,将二维剖面映射到三维空间,利用三维剖面上轮廓线的对应性和连续性构建地质体三维模型。通过广西东平地区地质体三维模型构建实例,验证了该方法的可行性。

英文摘要：

For large-scale areas with very limited exploration range the direct exploration data-based 3D modeling of geological body is not feasible.This paper presents a methodology of 3D modeling of geological body based on planar geological map.Section software draws a series of cutting sections under DEM constraints and the 2Dsection is transformed to 3Din space,then 3Dmodel built on GOCAD platform according to the correspondence and continuity of the section contours.Dongping area in Guangxi is a case which verifies feasibility of the method.