Research And Application Of Complex Surface Reconstruction Method Based On Surface Space Mapping

Geological surface reconstruction is one of the most important supporting technologies in the field of oil and gas exploration.It is the core technology of geological structure modeling,structural mapping,reservoir modeling and so on.The basic data of geological surface reconstruction is the data of structural data of seismic data.Data exists in the form of discrete seed lines or seed points.The task of geologic surface reconstruction is to build discrete points or lines into three-dimensional spatial surfaces.The existing methods of geological surface reconstruction are usually surface fitting in Cartesian coordinates,but due to the sparsity of the structural interpretation data,the fitting error is usually large.There is still no effective solution to the complex geological structures,especially the reversed structures.In this thesis,we focus on the method of surface reconstruction based on coordinate space transformation.The research work has great theoretical value and practical application valueAiming at the problem of geological surface reconstruction in complex geological structure,this thesis breaks through the limitation of traditional Cartesian coordinate space to express complex geological surface from the point of view of coordinate transformation.The main work and innovation are as follows:1.In this thesis,a complex geological surface reconstruction method based on surface space mapping is proposed for the complex geological surface reconstruction problem with reversed structure.The traditional method in the Cartesian coordinate space for surface reconstruction cannot effectively solve the projection overlap problem of the reversed area.In this thesis,a method of geological surface reconstruction based on surface space mapping is proposed.The basic idea is to construct the trend fitting by using the structural interpretation data.The trend surface is used as the reference coordinate surface of the surface coordinate space,and the projection distance between the point on the surface and the trend plane is taken as the z value of the surface coordinate space.Then the surface reconstruction is carried out in the surface coordinate space.Through the theoretical analysis and simulation analysis,the proposed method effectively solves the overlapping problem of the reversed region and improves the validity and adaptability of complex geological surface reconstruction;2.A method of geological surface reconstruction based on multi-objective optimization is proposed.The basic idea of this method is to construct the surface fitting problem into a multi-objective optimization model with surface smoothness and fitting error.And the penalty coefficient is used to realize the balance between smoothness and error.At the same time,the multi-objective optimization problem is transformed into a single objective optimization problem and solved.Through the theoretical research and simulation analysis,the method proposed in this thesis can effectively solve the trend control problem of geological surface reconstruction,which has great theoretical significance and practical application value.In summary,this thesis provides a new solution and ideas for complex geological surface reconstruction.