Study on seismic imaging block modeling method

Layer velocity modeling is not enough for high accuracy pre-stack imaging. But block velocity modeling may accurately describe complex subsurface geological structure. Through the research of seismic exploration block modeling method, this paper proposes a new practical workflow about block modeling, researches Delaunay triangulation algorithm, achieves surface structure geometrical modeling, and keeps the geometry and topology relationship, such as geologic horizon and fault. On the basis of surface structure triangulation meshes, this paper also researches the algorithms of curved surfaces intersection, subdivision, suture, united output and 3D Delaunay triangulation, realizes block geometric surface modeling and complicated geologic solid modeling, and overcomes the technology puzzle of the complicated structure block modeling.