3D Geological Modeling And Predicting In Xiangshan Volcanic Basin

Xiangshan volcanic basin is one of the important produced area of volcanic rock type uranium in our country.In the late 1950,the nuclear industry geological systems in this region carried out a large number of geological survey,exploration and scientific research work.Since more than fifty years,The volcanic basin has proved many amount of uranium resources,which occupys the important position in the uranium resources and is the important base of uranium development in our country.With the continuous development of computer 3D visualization technology,3D geological modeling technology is becoming more and more mature.This paper is based on the mentor-undertaken"Longcan Project"corpus project of the nuclear group.Through comprehensive geological interpretation of AMT data,identifying the structure characteristic of deep geological factors from the area of Xiangshan.Under the GOCAD software platform,established the 3D model of geological elements to achieve geology,geophysical information and the 3D visualization of deep geological structure elements of the area of Xiangshan.This study has following achievements and recognition:?1?The establishment of 3D geological database of Xiangshan.This paper collected the related geology,geophysical information and the data of Xiangshan,including exploration area AMT line?point?data,drilling data,the contour data,exploration area geological map data and remote sensing image raster data.On the basis of the data,processing the related data and establishing 3D geological database of Xiangshan.This can better display interpret model and metallogenic prediction in GOCAD.?2?Building 3D geological modeling of Xiangshan.On the based of GOCAD 3D geological modeling software platform,regards contour data,the occurrence data of construction,AMT geophysical geological interpretation data as the foundation data for3D geological modeling.Establishing unconformity surface?Qb/K₁?,the interface between groups?K₁d/K₁e?and the fault structural surface and so on.And established the3D sgrid model of the Xiangshan from the surface modeling,including the basement metamorphic rocks?Qb?,the rhyolitic dacite of K₁d,mortar lava solid model of K₁e and K₂.?3?The calculation of a variety of quantitative 3D ore-controlling evidences.On the based of 3D geological sgrid models,this paper carried out the research on the spatial characteristics analysis of the geological bodies character,including 3D buffer area of geological bodies,quantitatively extracted the spatial characteristics of 3D geological bodies and so on.Combined geophysical and geochemical exploration,doing data mining of ore-controlling factors.Then this paper combined the ore-forming regularity of Xiangshan area,3D geological models and weights of evidence method to calculate a variety of quantitative 3D ore-controlling evidences for the following prospective analysis by using weights of evidence method.?4?3D prediction of Xiangshan.Based on the quantitative 3D ore-controlling evidences,this paper calculated the posterior probability distribution data within the 3D space of Xiangshan using 3D weights of evidence method.Then on the based of the result character,carray out the classification of advantageous space in Xiangshan.