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    Effective Elliptic Models for Efficient Wavefield Extrapolation in Anisotropic Media

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    Type
    Conference Paper
    Authors
    Waheed, Umair bin cc
    Alkhalifah, Tariq Ali cc
    KAUST Department
    Earth Science and Engineering Program
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Seismic Wave Analysis Group
    Date
    2014-05-22
    Online Publication Date
    2014-05-22
    Print Publication Date
    2014
    Permanent link to this record
    http://hdl.handle.net/10754/333063
    
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    Abstract
    Wavefield extrapolation operator for elliptically anisotropic media offers significant cost reduction compared to that of transversely isotropic media (TI), especially when the medium exhibits tilt in the symmetry axis (TTI). However, elliptical anisotropy does not provide accurate focusing for TI media. Therefore, we develop effective elliptically anisotropic models that correctly capture the kinematic behavior of the TTI wavefield. Specifically, we use an iterative elliptically anisotropic eikonal solver that provides the accurate traveltimes for a TI model. The resultant coefficients of the elliptical eikonal provide the effective models. These effective models allow us to use the cheaper wavefield extrapolation operator for elliptic media to obtain approximate wavefield solutions for TTI media. Despite the fact that the effective elliptic models are obtained by kinematic matching using high-frequency asymptotic, the resulting wavefield contains most of the critical wavefield components, including the frequency dependency and caustics, if present, with reasonable accuracy. The methodology developed here offers a much better cost versus accuracy tradeoff for wavefield computations in TTI media, considering the cost prohibitive nature of the problem. We demonstrate the applicability of the proposed approach on the BP TTI model.
    Citation
    Waheed, U., & Alkhalifah, T. (2014). Effective Elliptic Models for Efficient Wavefield Extrapolation in Anisotropic Media. Proceedings 76th EAGE Conference and Exhibition 2014. doi:10.3997/2214-4609.20140813
    Publisher
    EAGE Publications
    Journal
    Proceedings 76th EAGE Conference and Exhibition 2014
    Conference/Event name
    76th EAGE Conference & Exhibition 2014
    DOI
    10.3997/2214-4609.20140813
    ae974a485f413a2113503eed53cd6c53
    10.3997/2214-4609.20140813
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program; KAUST Solar Center (KSC)

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