射线追踪的微变网格方法  

A GRID-CHANGEABLE METHOD FOR RAY TRACING

作　　者：徐昇 杨长春[1] 刘洪[1] 李幼铭[1] 

机构地区：[1]中国科学院地球物理研究所

出　　处：《地球物理学报》1996年第1期97-102,共6页Chinese Journal of Geophysics

基　　金：国家自然基金委员会;中国科学院;中国石油天然气总公司和大庆石油管理局联合资助

摘　　要：本文给出一种适用于叠前数据速度分析和叠前深度偏移的快速射线追踪方法──微变网格法；该方法不仅精度高，而且计算速度极快，可适用于当前计算条件下的地球介质速度反演和叠前深度偏移成像的要求．Since the amount of traveltime computation In heterogeneous media is very huge,related methods become prohibitively expensive, this article presents a new ray tracing method,in which grids can be changeable to fit raypaths for promoting the calculating accuracy and reducing the computer cost.Due to its following advantages:relatively small number of grids;cheaper computer cost; accurate computation of raypaths and traveltime.robust algorithm even for high velocity contrast; it promises to be a practical and efficient tool for prestack depth migration and velocity analysis.Several examples (include a real data one) are given here.

关 键 词：射线追踪 微变网格法 叠前深度偏移 地震勘探 

分 类 号：P631.4[天文地球—地质矿产勘探]