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    Efficient scattering-angle enrichment for a nonlinear inversion of the background and perturbations components of a velocity model

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    Type
    Article
    Authors
    Wu, Zedong cc
    Alkhalifah, Tariq Ali cc
    KAUST Department
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Seismic Wave Analysis Group
    Date
    2017-07-07
    Online Publication Date
    2017-07-07
    Print Publication Date
    2017-09
    Permanent link to this record
    http://hdl.handle.net/10754/625659
    
    Metadata
    Show full item record
    Abstract
    Reflection-waveform inversion (RWI) can help us reduce the nonlinearity of the standard full-waveform inversion (FWI) by inverting for the background velocity model using the wave-path of a single scattered wavefield to an image. However, current RWI implementations usually neglect the multi-scattered energy, which will cause some artifacts in the image and the update of the background. To improve existing RWI implementations in taking multi-scattered energy into consideration, we split the velocity model into background and perturbation components, integrate them directly in the wave equation, and formulate a new optimization problem for both components. In this case, the perturbed model is no longer a single-scattering model, but includes all scattering. Through introducing a new cheap implementation of scattering angle enrichment, the separation of the background and perturbation components can be implemented efficiently. We optimize both components simultaneously to produce updates to the velocity model that is nonlinear with respect to both the background and the perturbation. The newly introduced perturbation model can absorb the non-smooth update of the background in a more consistent way. We apply the proposed approach on the Marmousi model with data that contain frequencies starting from 5 Hz to show that this method can converge to an accurate velocity starting from a linearly increasing initial velocity. Also, our proposed method works well when applied to a field data set.
    Citation
    Wu Z, Alkhalifah T (2017) Efficient scattering-angle enrichment for a nonlinear inversion of the background and perturbations components of a velocity model. Geophysical Journal International 210: 1981–1992. Available: http://dx.doi.org/10.1093/gji/ggx283.
    Publisher
    Oxford University Press (OUP)
    Journal
    Geophysical Journal International
    DOI
    10.1093/gji/ggx283
    Additional Links
    https://academic.oup.com/gji/article-abstract/doi/10.1093/gji/ggx283/3933235/Efficient-scattering-angle-enrichment-for-a?redirectedFrom=fulltext
    ae974a485f413a2113503eed53cd6c53
    10.1093/gji/ggx283
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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