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    Waveform inversion in acoustic orthorhombic media with a practical set of parameters

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    segam2017-17672715.1.pdf
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    Expanded Abstract
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    Type
    Conference Paper
    Authors
    Masmoudi, Nabil cc
    Alkhalifah, Tariq Ali cc
    KAUST Department
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Seismic Wave Analysis Group
    Date
    2017-08-17
    Online Publication Date
    2017-08-17
    Print Publication Date
    2017-08-17
    Permanent link to this record
    http://hdl.handle.net/10754/626250
    
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    Abstract
    Full-waveform inversion (FWI) in anisotropic media is overall challenging, mainly because of the large computational cost, especially in 3D, and the potential trade-offs between the model parameters needed to describe such a media. We propose an efficient 3D FWI implementation for orthorhombic anisotropy under the acoustic assumption. Our modeling is based on solving the pseudo-differential orthorhombic wave equation split into a differential operator and a scalar one. The modeling is computationally efficient and free of shear wave artifacts. Using the adjoint state method, we derive the gradients with respect to a practical set of parameters describing the acoustic orthorhombic model, made of one velocity and five dimensionless parameters. This parameterization allows us to use a multi-stage model inversion strategy based on the continuity of the scattering potential of the parameters as we go from higher symmetry anisotropy to lower ones. We apply the proposed approach on a modified SEG-EAGE overthrust synthetic model. The quality of the inverted model suggest that we may recover only 4 parameters, with different resolution scales depending on the scattering potential of these parameters.
    Citation
    Masmoudi N, Alkhalifah T (2017) Waveform inversion in acoustic orthorhombic media with a practical set of parameters. SEG Technical Program Expanded Abstracts 2017. Available: http://dx.doi.org/10.1190/segam2017-17672715.1.
    Sponsors
    We would like to thank KAUST for financial support and SWAG members for many useful discussions. For computer time, this research used the resources of the Supercomputing Laboratory in KAUST.
    Publisher
    Society of Exploration Geophysicists
    Journal
    SEG Technical Program Expanded Abstracts 2017
    DOI
    10.1190/segam2017-17672715.1
    Additional Links
    https://library.seg.org/doi/10.1190/segam2017-17672715.1
    ae974a485f413a2113503eed53cd6c53
    10.1190/segam2017-17672715.1
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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