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    Wavenumber illumination analysis validation: Which elastic anisotropic parameters can we resolve?

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    seg_2019_ortho.pdf
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    Type
    Conference Paper
    Authors
    Kazei, Vladimir cc
    Kabanov, Dmitry cc
    Alkhalifah, Tariq Ali cc
    KAUST Department
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Seismic Wave Analysis Group
    Date
    2019-08-10
    Permanent link to this record
    http://hdl.handle.net/10754/661911
    
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    Abstract
    Vertical fractures are often embedded into a finely layered medium, which leads to an effective medium with orthorhombic anisotropy. Ten independent parameters are necessary to completely characterize such a medium, including density and excluding rotations. Through wavenumber illumination analysis, it has been shown that only six of these parameters can be reliably inverted from P - P scattered energy. Here, we demonstrate that with the addition of converted waves, nine parameters can principally be recovered. We also demonstrate that the one-dimensional null space is along a linear combination of the shear-wave dimensionless parameters, g1 and g2, or a linear combination of the elastic coefficients C12 and C66 parameters. This null space can be captured by the Thomsen g parameter if it is introduced into the parameterization. Finally and most importantly, there is still a lot of skepticism around the applicability of multiparameter model wavenumber illumination analysis, so we validate the radiation patterns using finite-difference modeling code. We find that theoretical scattering patterns are in good agreement with numerically modeled wavefields scattered from thin layers. The latter is a step towards applications of similar analysis, initially in the framework of time-lapse monitoring of the reservoirs, where the perturbations of parameters are generally small.
    Citation
    Kazei, V., Kabanov, D., & Alkhalifah, T. (2019). Wavenumber illumination analysis validation: Which elastic anisotropic parameters can we resolve? SEG Technical Program Expanded Abstracts 2019. doi:10.1190/segam2019-3216694.1
    Publisher
    Society of Exploration Geophysicists
    Conference/Event name
    Society of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019
    DOI
    10.1190/segam2019-3216694.1
    Additional Links
    https://library.seg.org/doi/10.1190/segam2019-3216694.1
    ae974a485f413a2113503eed53cd6c53
    10.1190/segam2019-3216694.1
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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