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    Regularized full-waveform inversion for salt bodies

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    Type
    Conference Paper
    Authors
    Kalita, Mahesh cc
    Kazei, Vladimir cc
    Choi, Yun Seok
    Alkhalifah, Tariq Ali cc
    KAUST Department
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Seismic Wave Analysis Group
    Date
    2018-08-27
    Online Publication Date
    2018-08-27
    Print Publication Date
    2018-08-27
    Permanent link to this record
    http://hdl.handle.net/10754/631153
    
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    Abstract
    Full-waveform inversion (FWI) aims to resolve an ill-posed non-linear optimization problem in order to retrieve unknown subsurface model parameters with high resolution from seismic data. The non-linearity, in the absence of low frequencies from the recorded seismic signal, tends to increase, especially for large-velocity structures, like salt bodies and the sediments beneath them, and often prevents the inversion from obtaining an adequate model. To alleviate the ill-posedness of FWI for salt-bodies, we propose to utilize model regularization in order to promote a limited variation in the inverted model and a salt-flooding regularization from the top of the salt (without picking). On that account, we split the optimization problem into two parts: first, we minimize the data misfit and the total variation in the model, seeking to achieve an inverted model with sharp interfaces; and second, we penalize sharp velocity drops in the model by a computational flooding of the velocity field. Unlike conventional industrial salt flooding, our proposed technique requires minimal human intervention and no information whatsoever about the top of the salt. Those features are demonstrated on a dataset of the Sigsbee2A model in which the lowest available frequency is 3 Hz. We retrieve most of the salt region and also some of the fine sedimentary layering beneath the salt.
    Citation
    Kalita M, Kazei V, Choi Y, Alkhalifah T (2018) Regularized full-waveform inversion for salt bodies. SEG Technical Program Expanded Abstracts 2018. Available: http://dx.doi.org/10.1190/segam2018-2995963.1.
    Sponsors
    We would like to thank KAUST for its support, all the members of Seismic Wave Analysis Group for fruitful discussions, the Supercomputer laboratory and IT Research Computing at KAUST for computer time. We also thank Antoine Guitton for his suggestions.
    Publisher
    Society of Exploration Geophysicists
    Journal
    SEG Technical Program Expanded Abstracts 2018
    Conference/Event name
    88th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2018
    DOI
    10.1190/segam2018-2995963.1
    Additional Links
    https://library.seg.org/doi/10.1190/segam2018-2995963.1
    ae974a485f413a2113503eed53cd6c53
    10.1190/segam2018-2995963.1
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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