逆时偏移方法技术进展综述

逆时偏移(RTM)利用双程波动方程,基于时间逆时外推对波场进行重构,理论上无倾角限制,可以实现对回转波、棱镜波以及多次波的正确成像,获得精确的动力学信息,具有良好的保幅性。然而,庞大的存储空间需求和计算量以及固有的低频成像噪声,使得RTM无法得到广泛的应用。针对上述问题,分析、对比了各种逆时偏移方法技术及其应用效果,测试了偏移去噪的几种方法,最后对逆时偏移的发展方向作了展望。

Review of reverse time migration

Reverse-time migration uses two-way wave equation to reconstruct the wavefield based on time-reversal extrapolation.Theoretically,RTM has no angle limitation and it can image turning waves,prismatic waves,and multiples correctly.RTM migrated data contains accurate kinetic information,and are more amplitude preserved than any other seismic imaging methods.However,the formidable amount of computation cost and storage requirements as well as the inherent low imaging noises limits the uses of RTM.This paper con...