Research Of 3d Geological Fault Modeling Method And Visualization

With the rapid development of the visualization theory and computer graphics, the 3D geological modeling and visualization have become the research hot points. The Geological visualization technology not only provides new ways for geological workers to observe geological spatial distribution and analyses geological phenomenon in three-dimensional space, but also makes more scientific decision-making for geologists. After an overview of research about 3D geological modeling in our country and foreign countries, this dissertation study some methods of geological modeling systematically, then puts forward a effective method to constructing geological fault modeling, and a approach for error correction of 3D geology modeling from virtual borehole.The main contents of dissertation are as following:(1) Study systematically the spatial interpolation algorithms applied in the process of geological modeling, analyze three different 3D geological models: Facial Model ,Volumetric Model, Hybrid Model. Analyzes the advantage and disadvantage of these models.(2) Make a comprehensive explanations and clarification about the concepts of geological fault, then analyze the geometry elements of the fault, and the types of the fault. Based on the study of existing geological fault modeling methods, a new method of modeling fault is put forward. Firstly, put the stratum back to the state when no fracture ,treat the layers on both sides of the fault as a continuous whole, the spatial interpolation and surface approximation are used, then calculate the cross line of the ground level and the fault, use this cross line as a common edge line of the both sides of the fault. At last, based on this edge line, adjust the edge line both side of the fault on the ground level according to the fault throw, generate the final fault model, experimental results prove the effectiveness of this approach.(3) Analyze the main factors which affect the accuracy of three-dimensional geological modeling, source of errors and three methods of accuracy assessment and testing. In accordance with the characteristics of drilling and virtual drilling, put forward a new error correction method for 3D strata model, experimental results show that the model modified with this method can reflect the actual distribution of the stratum more accurately, provide some guidance to engineering design and construction, and can greatly saving cost and time for field drilling.