Study on seismic imaging block modeling technology

Layer velocity modeling is not enough for high accuracy pre-stack imaging. But block velocity modeling may accurately describes subsurface complex geological structure. Through the research of seismic exploration block modeling method,this paper proposes a new and practicable workflow about block modeling,researches Delaunay triangulation algorithm ,achieves face structure geometrical modeling,keeps geometry and topology relationship,such as geologic horizon and fault. On the base of face structure triangulation grid,this paper also researches the algorithm of curved surfaces Inter-section,division,suture ,united input and 3D Delau-nay triangulation,achieves block geometric surface modeling and complicated geologic solid model ing,overcomes the technological puzzle of the complicated structure block modeling. Using block body model and velocity control point,it realizes the smooth interpretation of seismic imaging velocity depth block model.