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Abstract

Summary

The paper deduced a new first-order acoustic-elastic coupled equation (AECE) by submitting the pressure fields into the elastic velocity-stress equation (EVSE). The new equation has three advantages in elastic RTM for ocean bottom seismic (OBS) data over conventional elastic RTM using EVSE. First, the new equation can unify the wave propagation form in both acoustic and elastic media. Second, the new equation can directly realize P-wave separation in the wavefield propagation. Third, we have three approaches for dealing with the receiver-side multicomponent particle velocity records and pressure records in elastic RTM processing: (1) Particle velocity components are set as boundary conditions to proceed receiver-side vectorial extrapolation with the AECE, which is equal to the elastic RTM using the conventional EVSE; (2) The pressure component can also be used for receiver-side scalar extrapolation with the AECE, with which we can accomplish PP- and PS-images only using the pressure records, and suppress most of the artifacts in the PP-image with vectorial extrapolation; (3) Ocean bottom 4C data can be simultaneously used for elastic images with receiver-side tensorial extrapolation proposed by with the AECE. Synthetic data examples illustrate the effectiveness of this method.

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/content/papers/10.3997/2214-4609.201601204
2016-05-30
2024-04-27

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201601204
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Acoustic-elastic Coupled Equation for OBS Data Scalar-based Elastic RTM
Conference Proceedings 2016, 1 (2016); https://doi.org/10.3997/2214-4609.201601204
/content/papers/10.3997/2214-4609.201601204
/content/papers/10.3997/2214-4609.201601204
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