SP- and SS-imaging for 3D elastic reverse time migration
SP- and SS-imaging for 3D elastic reverse time migration
复制标题
用于 3D 弹性逆时偏移的 SP 和 SS 成像
DOI：
10.1190/geo2017-0286.1
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发表时间：
2018
期刊：
影响因子：
3.3
通讯作者：
Zhao Qiang
中科院分区：
文献类型：
--
作者：
Gong Xufei;Du Qizhen;Zhao Qiang
Three-dimensional elastic reverse-time migration has been confronted with the problem of generating scalar images with vector S-waves. The underlying principle for solving this problem is to convert the vector S-waves into scalars. Previous methods were mainly focused on PS imaging but usually cannot work properly on SP and SS cases. The complexity of SP and SS imaging arises from the fact that the incident S-wave has unpredictable relationship with the Raypath plane. We suggest that S-wave should be treated separately as SV- and SH-waves which keep predictable relationships with the Raypath plane. Firstly, the elastic wavefield is separated into P- and S-waves using Helmholtz decomposition. Then, we evaluate the normal direction of Raypath plane at each imaging grid. Next, we separate the vector S-wave obtained with curl operator into SH- and SV-waves, both of which are scalars. Finally, correlation imaging conditions are implemented to those scalar wave modes to produce scalar SV-P, SV-SV and, SH-SH images.
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