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Multiparameter least-squares reverse time migration for acoustic—elastic coupling media based on ocean bottom cable data
Applied Geophysics ( IF 0.7 ) Pub Date : 2020-03-26 , DOI: 10.1007/s11770-019-0771-4
Ying-Ming Qu , Chong-Peng Huang , Chang Liu , Chang Zhou , Zhen-Chun Li , Qurmet Worral

In marine seismic exploration, ocean bottom cable technology can record multicomponent seismic data for multiparameter inversion and imaging. This study proposes an elastic multiparameter lease-squares reverse time migration based on the ocean bottom cable technology. Herein, the wavefield continuation operators are mixed equations: the acoustic wave equations are used to calculate seismic wave propagation in the seawater medium, whereas in the solid media below the seabed, the wavefields are obtained by P- and S-wave separated vector elastic wave equations. At the seabed interface, acoustic-elastic coupling control equations are used to combine the two types of equations. P- and S-wave separated elastic migration operators, demigration operators, and gradient equations are derived to realize the elastic least-squares reverse time migration based on the P- and S-wave mode separation. The model tests verify that the proposed method can obtain high-quality images in both the P- and S-velocity components. In comparison with the traditional elastic least-squares reverse time migration method, the proposed method can readily suppress imaging crosstalk noise from multiparameter coupling.

中文翻译:

基于海底电缆数据的声弹性耦合介质的多参数最小二乘逆时偏移

在海洋地震勘探中,海底电缆技术可以记录多分量地震数据,以进行多参数反演和成像。本研究提出了一种基于海底电缆技术的弹性多参数租约平方逆时偏移。这里,波场连续算子是混合方程:声波方程用于计算地震波在海水介质中的传播,而在海床下方的固体介质中,波场是通过P波和S波分离的矢量弹性波获得的方程。在海床界面,声弹耦合控制方程式被用来组合两种类型的方程式。P波和S波分离的弹性迁移算子 推导了梯度方程,实现了基于P波和S波模式分离的弹性最小二乘逆时偏移。模型测试证明,该方法可以在P和S速度分量上获得高质量的图像。与传统的弹性最小二乘逆时偏移方法相比,该方法可以很容易地抑制多参数耦合引起的成像串扰噪声。
更新日期:2020-03-26
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