Elastic Wave Vector Decomposition for Common-Shot Multicomponent Data Using Pure Wave Equation in Transversely Isotropic Media

Anisotropic elastic wave vector decomposition for common-shot multicomponent data is a critical step in multicomponent seismic exploration. It is more difficult than the separation for elastic wavefield snapshots because the spatial derivatives along vertical direction cannot be calculated directly....

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Bibliographic Details
Published in:IEEE geoscience and remote sensing letters 2022, Vol.19, p.1-5
Main Authors: Gu, Bingluo, Han, Jianguang, Huang, Jianping, Ren, Zhiming, Li, Zhenchun
Format: Article
Language:English
Subjects:
Anisotropic
Anisotropic media
Anisotropy
common-shot multicomponent data
Decomposition
Elastic anisotropy
Elastic waves
Extrapolation
Feasibility studies
Isotropic media
Kinematics
Mathematical model
Media
P waves
Polarization
Propagation
S waves
Seismic exploration
Separation
Sun
Surface waves
vector decomposition
Vectors
Wave data
Wave equations
wave-mode separation
Workflow
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Summary:Anisotropic elastic wave vector decomposition for common-shot multicomponent data is a critical step in multicomponent seismic exploration. It is more difficult than the separation for elastic wavefield snapshots because the spatial derivatives along vertical direction cannot be calculated directly. In this letter, we propose an effective workflow to implement elastic wave vector decomposition for common-shot multicomponent data based on the pure-wave equation in transversely isotropic (TI) media. First, we extrapolate the multicomponent data backward in time to a reference surface using an anisotropic elastic wave equation, implement wave-mode separation by the projection of the extrapolated anisotropic elastic wavefields onto the polarization vectors of P- and S-wave-modes, and record the separated pure-wave data at the reference depth. Second, we extrapolate the separated anisotropic pure-wave data forward in time using the anisotropic pure-wave equations, perform the vector decomposition by the projection of the extrapolated pure-wave wavefields onto the polarization vectors of P- and S-modes, and record the vector anisotropic pure-wave data at the recording surface. This method can produce vector pure-mode data from the anisotropic medium with relatively high accuracy. Synthetic examples show the feasibility of this method.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2021.3051621