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    Angle gathers in wave-equation imaging for transversely isotropic media

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    Type
    Article
    Authors
    Alkhalifah, Tariq Ali cc
    Fomel, Sergey B.
    KAUST Department
    Earth Science and Engineering Program
    Environmental Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Seismic Wave Analysis Group
    Date
    2010-11-12
    Online Publication Date
    2010-11-12
    Print Publication Date
    2011-05
    Permanent link to this record
    http://hdl.handle.net/10754/561633
    
    Metadata
    Show full item record
    Abstract
    In recent years, wave-equation imaged data are often presented in common-image angle-domain gathers as a decomposition in the scattering angle at the reflector, which provide a natural access to analysing migration velocities and amplitudes. In the case of anisotropic media, the importance of angle gathers is enhanced by the need to properly estimate multiple anisotropic parameters for a proper representation of the medium. We extract angle gathers for each downward-continuation step from converting offset-frequency planes into angle-frequency planes simultaneously with applying the imaging condition in a transversely isotropic with a vertical symmetry axis (VTI) medium. The analytic equations, though cumbersome, are exact within the framework of the acoustic approximation. They are also easily programmable and show that angle gather mapping in the case of anisotropic media differs from its isotropic counterpart, with the difference depending mainly on the strength of anisotropy. Synthetic examples demonstrate the importance of including anisotropy in the angle gather generation as mapping of the energy is negatively altered otherwise. In the case of a titled axis of symmetry (TTI), the same VTI formulation is applicable but requires a rotation of the wavenumbers. © 2010 European Association of Geoscientists & Engineers.
    Citation
    Alkhalifah, T., & Fomel, S. (2010). Angle gathers in wave-equation imaging for transversely isotropic media. Geophysical Prospecting, 59(3), 422–431. doi:10.1111/j.1365-2478.2010.00930.x
    Publisher
    Wiley
    Journal
    Geophysical Prospecting
    DOI
    10.1111/j.1365-2478.2010.00930.x
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1365-2478.2010.00930.x
    Scopus Count
    Collections
    Articles; Environmental Science and Engineering Program; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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