Reverse-time Migration: Amplitude And Implementation Issues

Reverse-time Migration: Amplitude And Implementation Issues
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DOI:
10.1190/1.2792912
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发表时间:
2007
期刊:
Seg Technical Program Expanded Abstracts
影响因子:
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通讯作者:
Yu Zhang;James Sun;S. Gray
Yu Zhang;James Sun;S. Gray
中科院分区:
其他
文献类型:
--
作者:
Yu Zhang;James Sun;S. Gray

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在真幅偏移理论的基础上提出了逆时偏移(RTM),并给出了真幅逆时偏移角域共像集的计算公式。然后讨论RTM的一些实现问题。具体来说,我们在时间方向上使用不同阶的有限差分来比较RTM的效率。最后,我们提出了“谐波源迁移”,这是一种相位编码技术,可以提高RTM延迟拍摄实现的效率。
We formulate reverse-time migration (RTM) based on the theory of true-amplitude migration, and we give formulations for true-amplitude RTM angle-domain common-image gathers. Then we address some implementation issues for RTM. Specifically, we compare RTM’s efficiency using different orders of finite differencing along the time direction. Finally, we propose “harmonic-source migration”, a phase-encoding technique that allows increased efficiency in a delayed-shot implementation of RTM.