Research On Three-dimensional Modeling And Spatial Analysis Of Geological Body

Along with the development of the modern spatial information technology, the study and practice of the mineral exploration and the resource appraisal gradually develop to the digitization and the quantization. The geologic body's three-dimensional modeling and the ore-control geologic factors' quantitative analysis are the core question in the mineral exploration and the digitization and the quantitative research of the resource appraisal. Taking the Dachang Tin-polymetallic Ore Deposit in Guangxi province as an example, based on the three-dimensional geoscience modeling technology and the GIS spatial analysis technology, this thesis has designed and established the geological prospecting database and the modeling special database, and has realized the geologic body's three-dimensional modeling and discretization. The thesis proposes a three-dimensional space analysis model for ore-control geologic factors which is based on the field model, realizes the three-dimensional space analysis of the granite body ore-control geologic factor with the discretization method, and establishes the mathematical model which reflects the incidence relation between the granite ore-control geologic factor and the mineralization indicator.The author analyzed the three-dimensional GIS, virtual reality and three-dimensional geological modeling technology in this paper. On the basis of the analysis, the author collected geological exploration data in the study area, such as exploration and research reports, exploration engineering data tables, geological survey and sample data tables and all types of comprehensive geological maps. After digitization, coding and design of the logic and concept structures, the author designed and established a geological database, and then converted the geological data into the three-dimensional geological modeling data. The profile models, wire-frame models and solid models of the tin ore and granite were made with the modeling tool Datamine. The three-dimensional visual display and query of the exploration engineering and geological bodies was achieved. This paper founded a discrete method based on the grid model and realized the discrete expression and show of the geology entity models after the definition and discretization of the geological space domain. From the view point of the field analysis, This paper proposed a three-dimensional analysis method based on the field model, which method can be used in describing the geological controlling factors in the space around the geological body. Employing the discretization method, the author implemented the spatial analysis of ore-controlling actions of the Dachang granite. By statistical analysis, the association of the granite ore-control factor and mineralization distribution was quantitative analyzed. As a result, the quantitative model of granite ore-controlling actions was built, which supplies the evidence for localization prediction of concealed ore bodies.