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    Migration velocity analysis using pre-stack wave fields

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    Type
    Article
    Authors
    Alkhalifah, Tariq Ali cc
    Wu, Zedong cc
    KAUST Department
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Seismic Wave Analysis Group
    Date
    2016-08-25
    Online Publication Date
    2016-08-25
    Print Publication Date
    2017-05
    Permanent link to this record
    http://hdl.handle.net/10754/625016
    
    Metadata
    Show full item record
    Abstract
    Using both image and data domains to perform velocity inversion can help us resolve the long and short wavelength components of the velocity model, usually in that order. This translates to integrating migration velocity analysis into full waveform inversion. The migration velocity analysis part of the inversion often requires computing extended images, which is expensive when using conventional methods. As a result, we use pre-stack wavefield (the double-square-root formulation) extrapolation, which includes the extended information (subsurface offsets) naturally, to make the process far more efficient and stable. The combination of the forward and adjoint pre-stack wavefields provides us with update options that can be easily conditioned to improve convergence. We specifically use a modified differential semblance operator to split the extended image into a residual part for classic differential semblance operator updates and the image (Born) modelling part, which provides reflections for higher resolution information. In our implementation, we invert for the velocity and the image simultaneously through a dual objective function. Applications to synthetic examples demonstrate the features of the approach.
    Citation
    Alkhalifah T, Wu Z (2016) Migration velocity analysis using pre-stack wave fields. Geophysical Prospecting 65: 639–649. Available: http://dx.doi.org/10.1111/1365-2478.12439.
    Sponsors
    We thank KAUST for its support. We also thank the associate editor Gilles Lambaré, Francesco Perrone, and two anonymous reviewers for their fruitful comments and suggestions.
    Publisher
    Wiley
    Journal
    Geophysical Prospecting
    DOI
    10.1111/1365-2478.12439
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1111/1365-2478.12439/full
    ae974a485f413a2113503eed53cd6c53
    10.1111/1365-2478.12439
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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