Type
ArticleAuthors
Alkhalifah, Tariq Ali
Wu, Zedong

KAUST Department
Earth Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
Seismic Wave Analysis Group
Date
2016-08-25Online Publication Date
2016-08-25Print Publication Date
2017-05Permanent link to this record
http://hdl.handle.net/10754/625016
Metadata
Show full item recordAbstract
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
WileyJournal
Geophysical ProspectingAdditional Links
http://onlinelibrary.wiley.com/doi/10.1111/1365-2478.12439/fullae974a485f413a2113503eed53cd6c53
10.1111/1365-2478.12439