Digital Simulation Modeling Of 3D Structure Of Guanyinxia Anticline In Chongqing Tianfu Area

Anticline of Guanyin canyon in Tianfu of Chongqing located in the southern section of the high and steep fold belt in the east of Sichuan,it belongs to the branch of anticline of Huaying Mountain.The study area is rich in structural phenomena,complex in stratum deformation and clear in outcrop phenomenon.As the main base of structure practice in our school,in order to further find out the characteristics of deformation in structure and distribution of three-dimensional structure in this area,and match the research of suppositional simulation and imtation and the construction of digital practice base in our school,digital simulation modeling of the 3D structure can be used to display the overall shape and spatial distribution characteristics of the anticline of Guanyin Gorge in three-dimensional space,which can provide powerful data support for the suppositional simulation experiment.On the basis of previous studies,this paper uses the modern theory of structural geology on the basis of surface outcrop and measured data through field observation,the characteristics of surface structure in anticline along Guanyin gorge in Tianfu region of Chongqing are analyzed.Taking geological data of the surface as the constraint,the fine structural interpretation of the seismic section in this area is carried out,and the relations of geometric deformation in deep and shallow deformation are analyzed.The quantitative simulation of kinematics based on trishear model is carried out by using the balanced geological section,and the kinematics process of anticline along Guanyin Gorge is found out.The 3D digital modeling of the study area is carried out based on the surface and seismic interpretation data,and the 3D distribution characteristics of anticline along Guanyin Gorge are analyzed.Through 3D modeling and digital elevation model,digital structural mapping is completed,and on the basis of 3D structural restoration,structural deformation parameters are extracted,and characteristics of fault system of the target layer are analyzed.The result of structural analysis show that the deep structural shape of Guanyinxia anticline with deep and tight is affected by the upward thrust of the Cambrian detachment,and the fault propagation fold is formed,and in the process of the formation of the fold,secondary faults of different sizes induced by different sites in the study area.The results of digital mapping show that the digital mapping is consistent with the actual geological features,but it is more accurate and convenient than manual mapping and has irreplaceable advantages.It is considered that the fractures mainly develop at the hinge zone of anticline and syncline and the fracture strike is parallel to the hinge of fold and tensional fracture is the main fault by analyzing the fracture.