The Research Of 3D Modeling For Tectonic-Stratigraphic Framework Based On Borehole Data

According the data resources of modeling, there are three kinds of approach to simulate tectonic-stratigraphic framework: based on geologic ichnography, based on geologic cross-section and based on borehole data. This thesis aimed at resolving the technology of modeling tectonic-stratigraphic framework based on borehole data by specialty research.How to simulate the tectonic-stratigraphic framework based on borehole data, it is still not resolved absolutely. In 1999, Wang Xiaohai brought forward a method to generate 3D rock-cliff project groundsill model based three-dimensional topological grid structure in the researching of GIS stratum models. Recently, Alan M. Lemon and Norman L. Jones (America Brigham Young University, Environmental Modeling Research Laboratory) study it. They build models from boreholes data with user-defined cross-sections. Wang Xiaohai constructs those models could only express groundsill structure, but could not express fault and needle volume and water-eroded cave and so on. In substance, the method HORIZONS of Alan and Norman (2003), belongs to the technology of 3D modeling based geology ichnography.This thesis adopts Tri-Grid method to build 3D tectonic-stratigraphic framework based on borehole data automatically. There are three highlights: (1) divide the simulating of tectonic-stratigraphic framework into two processions as on the direction paralleling stratum-extended and on the direction plumbing stratum-extended, in order to reduce the complexity of stratum contrasting and improve the speed of stratum contrasting; (2) inosculate the modeling of geologic phenomena such as needle-out and water-eroded cave into the stratum auto-contrasting, deal with them as regular stratums, in order to reduce unnecessary trouble of interactive modify after stratigraphic framework generated and reduce the error of interactive operation; (3) fetch the technology of curve-face cutting in resolving the generation of plus faultage and contrary faultage in the stratigraphic framework.According to the position of boreholes, we can set the coordinates to triangulate by someprinciple in order to generate the triangle cell network. Then the simulation could be divided into two processions: the stratum contrasting on the direction paralleling stratum-extended and on the direction plumbing stratum-extended in order to improve the speed of stratum contrasting. For the geologic phenomena such as needle-out and water-eroded cave, according to the attribute described in borehole data, take them as regular stratums and inosculate the modeling of into the stratum auto-contrasting, to reduce unnecessary trouble and error of interactive operation. In geology tectonics, the faultage is a cataclasm face formed after when the stratum had shaped. Following this geologic course, the author fetch the technology of curve-face cutting in resolving the generation of plus faultage and contrary faultage in the stratigraphic framework. How to make the framework generated automatically accords with the fact and expert thought exactly is one of the main difficulties. The next step is to combine the artificial intelligence and the expert knowledge system to perfect the auto-modeling tectonic-stratigraphic framework with current models base.