Study on 3D Modeling Method of Faults Based on GTP Volume

3D fault modeling is one of the key issues of three-dimensional geosciences modeling system (3DGMS). Summarized the 3D modeling methods of faults at present, a new method, named as partition recursively modeling of the rock pillar body (RPB), for 3D modeling of faults (3DMF) based on generalized tri-prism (GTP) volume is put forward. This method takes borehole data as its original data source. The process for 3DMF includes: a) to generate the constrained delaunay TIN (CD-TIN) of terrain according to the collar data of borehole and the outcrops of faults; b) to construct the limit triangles in each PRB; c) to create 3D faults models according to the limit triangles. The test shows that the RPB method can accurately describe 3D complicated faults system involving obverse faults and reverse faults.