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    Full-waveform inversion in an anisotropic elastic earth - Can we isolate the role of density and shear wave velocity?

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    Type
    Conference Paper
    Authors
    Guitton, A.
    Alkhalifah, Tariq Ali cc
    KAUST Department
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Seismic Wave Analysis Group
    Date
    2017-03-13
    Permanent link to this record
    http://hdl.handle.net/10754/663914
    
    Metadata
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    Abstract
    Five parameters are needed to describe VTI anisotropy in 2-D elastic media. With conventional streamer data, an optimal parameterization for full-waveform inversion (FWI) consists in using the horizontal velocity vh, the anellipicity parameter ζ, and the parameter that relates the horizontal-to-vertical velocity, ϵ. This parameterization, derived with a pseudo-acoustic formulation of the wave equation, minimizes crosstalks. We extend this analysis to the elastic case and wonder what are the effects of density and shearwave velocity on the inversion results if ignored. Using radiation patterns derived in the elastic case and a modified version of the Marmousi II model, we see that PP-waves are mostly helping to recover vh and ϵ, while PS-waves are mostly helping to recover ζ. For all scattering angles and wave modes, ϵ and ρ are strongly coupled. Keeping ρ and vs unchanged during the inversion is a valid strategy if their background models are good enough. For small vs and ρ errors, the vs perturbation will map into ζ while ρ will map into ϵ. For large errors, vs adversely affects the recovery of ζ and might leak into vh while ρ will preferentially leak into ϵ, then ζ and, in smaller proportions, into vh.
    Citation
    Guitton, A., & Alkhalifah, T. (2016). Full-waveform Inversion in an Anisotropic Elastic Earth - Can We Isolate the Role of Density and Shear Wave Velocity? 78th EAGE Conference and Exhibition 2016. doi:10.3997/2214-4609.201601193
    Sponsors
    We thank KAUST and the Center for Wave Phenomena sponsors for their financial s u pport. Antoine Guitton thanks GeoImaging Solutions Inc. for permission to publish this work.
    Publisher
    EAGE Publications
    Conference/Event name
    78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential
    ISBN
    9789462821859
    DOI
    10.3997/2214-4609.201601193
    Additional Links
    http://www.earthdoc.org/publication/publicationdetails/?publication=85438
    ae974a485f413a2113503eed53cd6c53
    10.3997/2214-4609.201601193
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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