3D MODELING OF GEOLOGICAL BODIES BASED ON GTP AND ITS GENERATION OF FINITE ELEMENT MESH

摘要

In view of the researches on 3D geosciences modeling and presented 3D spatial models during the past decades, a generalized tri-prism (GTP) model, being capable of spatial topological relationship describing, is introduced. This model takes borehole data as its original data source, and the model construction process includes: 1) to generate Delaunay TIN (D-TIN) of the geological upper surface according to borehole's collar data, 2) to extend each triangle of the D-TINs down into GTP along borehole line referring to the geological knowledge inference rule. The new approach for 3D modeling and visualization of geological body based on GTP volume, and the method of partition this model into finite element mesh are introduced. A real-3D geosciences modeling system, GeoMo3D, developed with VC++, OpenGL and SQL sever, an actual 3D geological model, is shown as a case.