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    Spectral implementation of full waveform inversion based on reflections

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    Type
    Conference Paper
    Authors
    Wu, Zedong cc
    Alkhalifah, Tariq Ali cc
    KAUST Department
    Earth Science and Engineering Program
    Environmental Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Seismic Wave Analysis Group
    Date
    2014
    Permanent link to this record
    http://hdl.handle.net/10754/564851
    
    Metadata
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    Abstract
    Using the reflection imaging process as a source to model reflections for full waveform inversion (FWI), referred to as reflection FWI (RFWI), allows us to update the background component of the model, and avoid using the relatively costly migration velocity analysis (MVA), which usually relies on extended images. However, RFWI requires a good image to represent the current reflectivity, as well as, some effort to obtain good smooth gradients. We develop a spectral implementation of RFWI where the wavefield extrapolations and gradient evaluation are performed in the wavenumber domain, obtaining clean dispersion free and fast extrapolations. The gradient, in this case, yields three terms, two of which provide us with each side of the rabbit ear kernel, and the third, often ignored, provides a normalization of the reflectivity within the kernel, which can be used to obtain a reflectivity free background update. Since the image is imperfect (it is an adjoint, not an inverse), an optimization process for the third term scaling is implemented to achieve the smoothest gradient update. A rare application of RFWI on the reflectivity infested Marmousi model shows some of the potential of the approach.
    Citation
    Wu, Z., & Alkhalifah, T. (2014). Spectral Implementation of Full Waveform Inversion Based on Reflections. Proceedings 76th EAGE Conference and Exhibition 2014. doi:10.3997/2214-4609.20140853
    Publisher
    EAGE Publications
    Journal
    Proceedings 76th EAGE Conference and Exhibition 2014
    Conference/Event name
    76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014
    ISBN
    9781632666949
    DOI
    10.3997/2214-4609.20140853
    ae974a485f413a2113503eed53cd6c53
    10.3997/2214-4609.20140853
    Scopus Count
    Collections
    Conference Papers; Environmental Science and Engineering Program; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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