地震成像块体建模技术研究

层状速度建模不能满足高精度叠前成像的需求,而块体速度建模可以精细刻画地下的复杂地质构造。本文通过对地震勘探块体建模方法的研究,提出了一套行之有效的块体建模实用化处理流程;并利用Delaunay剖分和限定Delaunay剖分算法,解决了地质层位和断层等面构造几何建模问题,保证了地质层位在空间几何拓扑的一致性;研究了层面求交、分割、缝合、统一输出和3D限定Delaunay剖分算法,实现了块体几何表面建模和复杂地质体三维实体建模,解决了复杂构造块体建模的技术难题;利用块体实体模型和速度控制点实现了地震成像三维速度深度块体模型的光滑插值。

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.