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    Shot- and angle-domain wave-equation traveltime inversion of reflection data: Theory

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    Type
    Article
    Authors
    Zhang, Sanzong cc
    Luo, Yi
    Schuster, Gerard T. cc
    KAUST Department
    Center for Subsurface Imaging and Fluid Modeling
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2015-05-26
    Online Publication Date
    2015-05-26
    Print Publication Date
    2015-07
    Permanent link to this record
    http://hdl.handle.net/10754/556185
    
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    Abstract
    The main difficulty with iterative waveform inversion is that it tends to get stuck in local minima associated with the waveform misfit function. To mitigate this problem and avoid the need to fit amplitudes in the data, we have developed a wave-equation method that inverts the traveltimes of reflection events, and so it is less prone to the local minima problem. Instead of a waveform misfit function, the penalty function was a crosscorrelation of the downgoing direct wave and the upgoing reflection wave at the trial image point. The time lag, which maximized the crosscorrelation amplitude, represented the reflection-traveltime residual (RTR) that was back projected along the reflection wavepath to update the velocity. Shot- and angle-domain crosscorrelation functions were introduced to estimate the RTR by semblance analysis and scanning. In theory, only the traveltime information was inverted and there was no need to precisely fit the amplitudes or assume a high-frequency approximation. Results with synthetic data and field records revealed the benefits and limitations of wave-equation reflection traveltime inversion.
    Citation
    Shot- and angle-domain wave-equation traveltime inversion of reflection data: Theory 2015, 80 (4):U47 GEOPHYSICS
    Publisher
    Society of Exploration Geophysicists
    Journal
    GEOPHYSICS
    DOI
    10.1190/geo2014-0178.1
    Additional Links
    http://library.seg.org/doi/abs/10.1190/geo2014-0178.1
    ae974a485f413a2113503eed53cd6c53
    10.1190/geo2014-0178.1
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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