逆时偏移去噪方法研究进展

Reverse time migration and removing artifacts

逆时偏移(RTM)作为精度较高的深度域成像方法之一越来越受到人们的重视..基于双程波动方程的逆时偏移具有原理简单、无倾角限制、可以用于复杂区域和陡倾角构造成像等优点.本文概述了国内外逆时偏移的发展历程和现状,介绍了应用随机边界条件后逆时偏移基本原理以及存在的问题并分析了成像噪声的产生机制,重点给出成像后压制逆时偏移低频噪声的几种方法及特征并给出总体认识.

Reverse time migration which based on two-way wave equation is a quite attractive tool because of its capabilities of accurate imaging in depth domain, simple principle , no angle limitation of one way propagator recent years. So it has attracted more attention. At the beginning of this paper, we review the development of reverse time migration and analyze the generation principle of reverse time migration with random boundaries and imaging noise. However, these are imaging problems such as the highly intensive computation cost, low frequency artifacts and massy memory demand. We focus on different ways to suppress the migration artifacts and show how noise attenuation can be handled effectively and their respective advantages and disadvantages. Finally, we points out the prospect of future development in this field.