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    Multi-Parameter Estimation for Orthorhombic Media

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    Type
    Article
    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
    2015-08-19
    Online Publication Date
    2015-08-19
    Print Publication Date
    2015-08-19
    Permanent link to this record
    http://hdl.handle.net/10754/593140
    
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    Abstract
    Building reliable anisotropy models is crucial in seismic modeling, imaging and full waveform inversion. However, estimating anisotropy parameters is often hampered by the trade off between inhomogeneity and anisotropy. For instance, one way to estimate the anisotropy parameters is to relate them analytically to traveltimes, which is challenging in inhomogeneous media. Using perturbation theory, we develop travel-time approximations for orthorhombic media as explicit functions of the anellipticity parameters η1, η2 and a parameter Δγ in inhomogeneous background media. Specifically, our expansion assumes inhomogeneous ellipsoidal anisotropic background model, which can be obtained from well information and stacking velocity analysis. This approach has two main advantages: in one hand, it provides a computationally efficient tool to solve the orthorhombic eikonal equation, on the other hand, it provides a mechanism to scan for the best fitting anisotropy parameters without the need for repetitive modeling of traveltimes, because the coefficients of the traveltime expansion are independent of the perturbed parameters. Furthermore, the coefficients of the traveltime expansion provide insights on the sensitivity of the traveltime with respect to the perturbed parameters. We show the accuracy of the traveltime approximations as well as an approach for multi-parameter scanning in orthorhombic media.
    Citation
    Nabil Masmoudi* and Tariq Alkhalifah (2015) Multi-Parameter Estimation for Orthorhombic Media. SEG Technical Program Expanded Abstracts 2015: pp. 504-508. doi: 10.1190/segam2015-5836248.1
    Publisher
    Society of Exploration Geophysicists
    Journal
    SEG Technical Program Expanded Abstracts 2015
    DOI
    10.1190/segam2015-5836248.1
    Additional Links
    http://library.seg.org/doi/10.1190/segam2015-5836248.1
    ae974a485f413a2113503eed53cd6c53
    10.1190/segam2015-5836248.1
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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