基于线框单元体的三维闭合地质块体构建方法

为能充分利用空间数据模型中的拓扑关系来实现三维闭合块体的构建，引入了表示简单块体轮廓的线框单元体概念来组织三维模型间各要素之间的拓扑关系；并以此为基础给出了以方向边和方向三角形作为基本识别单元进行三维简单形体的自动识别方法。应用实例表明：利用该方法不仅可以准确构建复杂地质块体，还可以准确描述块体内各要素的拓扑关系，再现局部特殊地质现象，如小断层（悬面）等。为三维地质模型在地震正演模拟、射线追踪等分析应用方面提供了基础。

3D Sealed Geological Block Modeling with Wire Frame Component

To construct 3D geological blocks with the topology of spatial data model,the notion of wire frame component describing the outline of simple block is presented to organize the topology of elements in the 3D geological model.With the help of the notion,an automatic block identification approach is proposed,in which the directed edge and directed triangle are used as basic search unit.The simulation result illustrated that the approach presented not only can model complex blocks,but also can exactly represent the topology among the elements in the block and local geological phenomena such as small fault (free face).The method provides base of the application of 3D geology model to seismic forward modeling,ray tracing,etc.