基于波前面三角形网格剖分的波前重建法三维射线追踪  

3D wavefront construction method ray tracing based on triangular grids layout on wavefront

作　　者：李波涛[1] 杨长春[1] 陈雨红[1,2] 孙福利[1] 吴萍[1] 

机构地区：[1]中国科学院地质与地球物理研究所油气综合地球物理重点实验室,北京100029 [2]中国科学院兰州地质研究所,兰州730000

出　　处：《地球物理学进展》2009年第2期507-512,共6页Progress in Geophysics

基　　金：国家重点基础研究发展计划(2005CB422104)资助

摘　　要：在许多地震反演和偏移成像方法中,都要涉及到射线路径和旅行时的计算.本文将波前面三角形网格剖分和三维波前重建法射线追踪技术结合使用,实现了射线路径和旅行时的准确快速计算.三维波前重建法射线追踪过程中可以保证稳定合理的射线密度,克服了常规射线追踪方法存在阴影区的问题.波前面三角形网格剖分在描述和拆分波前面时更加准确有效,而且不需太多的网格数目,从而提高了射线追踪的精度和效率.该方法在三维复杂构造成像方面有独特的优势,目前在实际的Kirchhoff偏移中的已经有相关应用.In many seismic inversion and migration imaging methods, we need to calculate ray paths and travel times. This paper applies triangular grids layout on wavefront and the 3D wavefront construction method on ray tracing, actualizes quick and exact calculation of ray paths and travel times. The 3D wavefront construction method ray tracing can ensure stabile and reasonable density of rays, avoid the shadow problems in those traditional methods for ray tracing. Triangular grids layout on wavefront, with few grids, is more exact and effective in description and division of wavefront, and can improve precision and efficiency of ray tracing. This method has particular advantages in 3D migration and imaging of complicated oil and gas structures, and has been practically applied to Kirchhoff migration.

关 键 词：三角形网格 网格剖分 波前重建 射线追踪 射线路径 走时 

分 类 号：P631[天文地球—地质矿产勘探]