【摘要】 转换波成像困难的关键在于转换波的共转换点位置难以求准。本文在抽取渐近转换点(ACP)的基础上,采用基于多参数速度模型的Kirchhoff偏移算法实现叠前偏移成像,避开抽取共转换点难的问题,可以从常规速度分析方法中求取与转换波有关的速度参数。该方法很好地解决了转换波不对称性射线路径及强各向异性等带来的不利影响,实现了实际地震道转换波的不同反射层段在空间上的归位。更多还原

【Abstract】 The difficulty in precisely estimating location of the common transform point for converted wave results in difficulty for the converted wave imaging.Based on the extraction of the progressive conversion point,the Kirchhoff migration algrithm based on the multiparameter velocity model was conducted to realize pre-stack time migration,by avoiding difficulty in extraction of common transform point,the velocity parameters which are related to converted wave can be extracted from conventional velocity analysis method.With the method the adverse effects which were caused by converted wave asymmetry ray path and strong anisotropy were removed,and the different reflection segments in space for field seismic trace converted wave were migrated to its original location in the space.更多还原