Anisotropic JMI: Including the Multiples in Anisotropy Estimation

D.J. Verschuur, Abdulrahman Alshuhail

    Research output: Chapter in Book/Conference proceedings/Edited volumeChapterScientific

    Abstract

    Joint Migration Inversion (JMI) is a full wavefield, data-driven method. It simultaneously inverts for reflectivities and velocities and includes all multiples and transmission effects. In its current implementation JMI assumes an isotropic medium. If the medium exhibits an anisotropic behavior there will be a residual error between observed and calculated data due to the limitations assumed in isotropic wave propagation. Therefore, it is necessary to account for anisotropy in JMI. This is especially important for wide-azimuth and wide-aperture surveys, where horizontally traveling waves are move evident. In this chapter we incorporate anisotropic inversion in JMI. We start by finding a suitable parametrization that reduces the intrinsic tradeoff between velocity and anisotropy. We also utilize multiples in further reducing the trade-off between the parameters. We note that multiples generally spend more
    time in the subsurface, hence they have a greater sensitivity to the subsurface parameters. Therefore, parameters become more accurate when multiples are included in the anisotropy estimation. We develop the inversion method for estimating anisotropy and incorporate it into the JMI method. We test the effectiveness of the method on the HESS SEG VTI synthetic model.
    Original languageEnglish
    Title of host publicationDelphi; The Multiple Estimation and Structural Imaging Project (2015)
    Subtitle of host publicationFrom seismic measurements to rock and pore parameters
    Place of PublicationDelft
    PublisherDelft University of Technology
    Pages151-172
    VolumeXXVII
    ISBN (Print)978-90-73817-64-7
    Publication statusPublished - Jan 2016

    Keywords

    • Anisotropic, anisotropy estimation

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