射线追踪的微变网格方法

A GRID-CHANGEABLE METHOD FOR RAY TRACING

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.