1887

Abstract

Summary

High-resolution velocity model building is crucial for depth migration. Inaccurate model will lead to poor image qualities. Full waveform inversion (FWI) is developed to generate more geologically realistic and higher resolution velocity model iteratively. However, it’s challenging to apply FWI on narrow azimuth acquisition (NAZ) data. Here we proposed a more robust multistage FWI workflow. For the first stage, we introduce dynamic warping preconditioned full waveform inversion (DWFWI) to mitigate the cycle-skipping problem, which creates large scale background updates. In the second stage, the conventional FWI with image-guided regularization (IGFWI) is introduced to overcome the footprint problem and help the convergence, which can add more detailed updates to the velocity model with much higher resolution with more reflection events included and inverted. Due to poor crossline sampling, FWI updates in the crossline direction always contain strong acquisition footprints and swing artifacts. Image guided regularization is powerful to remove the acquisition footprints as well as preserve the detailed update around the faults. This new workflow is applied on the Hoop Fault Complex data in the southwestern Barents Sea. A more geologically realistic and higher-resolution model of the Hoop Fault Complex is obtained with improved migration image and gathers significantly.

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/content/papers/10.3997/2214-4609.201701157
2017-06-12
2021-10-20
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References

  1. Hale, D.
    [2013] Dynamic warping of seismic images, Geophysics, 78(2), S105–S115.
    [Google Scholar]
  2. Hart, M., AdewumiO., LangC., HilburnG., and RodriguezG.
    [2015] High resolution velocity model building over the Hoop Fault Complex, 85th Annual International Meeting, SEG, Expanded Abstracts, 5189–5193.
    [Google Scholar]
  3. Pratt, R. G., ShinC., and HicksG. J.
    [1998] Gauss-Newton and full Newton methods in frequency-space seismic waveform inversion, Geophysical Journal International, 133, 341–362.
    [Google Scholar]
  4. Rodriguez, G., LundyA., HartM., LangC., CaiJ., ChangI. and ZhangQ.
    [2011] Imaging the Hoop Fault complex via horizon and fault constrained tomography:81st Annual International meeting, SEG, Expanded Abstracts, 4025–4029.
    [Google Scholar]
  5. Virieux, J., and OpertoS.
    , [2009] An overview of full waveform inversion in exploration geophysics, Geophysics, 74(6), WCC1–WCC26.
    [Google Scholar]
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