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首页> 外文期刊>Pure and Applied Geophysics >Analytic Acoustic-Elastic Coupled Equations and Their Application in Vector-Wave-Based Imaging of Ocean Bottom 4C Data
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Analytic Acoustic-Elastic Coupled Equations and Their Application in Vector-Wave-Based Imaging of Ocean Bottom 4C Data

机译：分析声学 - 弹性耦合方程及其在海底4C数据的向量波成像中的应用

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摘要

In conventional vector-wave-based elastic reverse-time migration, there are two types of artifacts: low-frequency artifacts and nonphysical artifacts. Vector-decomposition-based acoustic-elastic coupled equations are effective in suppressing nonphysical artifacts by using ocean bottom four component (4C) seismic data for receiver-side tensorial extrapolation. We introduce up/down-going wave separation into the vector-decomposition-based acoustic-elastic coupled equations, and deduce novel analytic acoustic-elastic coupled equations. With these novel equations, we can obtain the source-side and receiver-side up-going and down-going P/S-wave vectors in wavefield propagation, and effectively suppress both of the artifacts in vector-wave-based elastic reverse-time migration by combining receiver-side tensorial extrapolation and the decomposed vector-wave-based imaging conditions. Examples using synthetic data and field data are presented to illustrate the validity and effectiveness of our method.
机译：在传统的载体波的弹性反向时间迁移中，有两种类型的伪像：低频伪像和非物理伪影。矢量分解的声学弹性耦合方程是通过使用海底四组分（4C）地震数据来抑制非物理伪像进行接收器侧张采外推。我们将上/下波分离引入向量分解的基于矢量的声学 - 弹性耦合方程，并推导了新颖的分析声 - 弹性耦合方程。利用这些小说方程，我们可以获得波场传播中的源端和接收侧向上行和下降的P / S波矢量，并有效地抑制了基于矢量波的弹性相反时间的伪像通过组合接收器侧姿势外推和分解的矢量波的成像条件来迁移。提出了使用合成数据和现场数据的示例以说明我们方法的有效性和有效性。

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