Abstract:

In 3D stuctural modeling， during construction of the stratigraphic surface， unreasonable stratigraphic thickness often arises by the interpolation point that is not consistent with the actual geological conditions. To address this problem， a new method for the thickness control is proposed. Firstly， a model of spatial index and OBB collision for triangulated irregular network is established. Secondly， according to the model， the position of the layer with unreasonable thickness is found out by intersection test. Thirdly， with the thought of geometry subdivision in topology， the thickness control is performed on zero and one dimensions. This method has been successfully applied in petroleum and mine field. The results show that the algorithm is fast， stable and reliable. It can be used to control the thickness of the layer automatically， avoiding massive manual interaction operations of thickness adjustment.

Key words: stratigraphic thickness control, 3D geological modeling, 3D structural modeling, triangulated irregular net-work (TIN), collision test, spatial index