1887

Abstract

Summary

The size and complexity of the mega gas clouds in offshore Brunei pose severe imaging problems to the structures underneath. We present a comprehensive technical package to tackle the complex wave propagation and anelastic energy losses associated with these gas clouds. We started by running FWI to resolve the velocity of the shallow gas clouds, followed by reflection tomography. We then conducted FWI-guided Q tomography to obtain a high-resolution absorption model. For the deep gas clouds, since their depth and the incurred low signal-to-noise ratio in the CMP gathers are beyond the limit of these geophysical methods, we moved on with geologically-guided scenario testing in intense collaboration with geologists. Finally, we carried out visco-acoustic TTI reverse time migration (Q TTI RTM) to better deal with the issues of multi-pathing and strong attenuation. This complete package brings significant uplift to the image as compared to the vintage QPSDM result, and therefore can serve as an effective option before turning to C-wave imaging.

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/content/papers/10.3997/2214-4609.201601350
2016-05-31
2020-04-04
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References

  1. Aki, K. and P.G.Richards
    [1980] Quantitative seismology – theory and methods, Freeman.
    [Google Scholar]
  2. Doust, H. and H.S.Sumner
    , 2007, Petroleum systems in rift basins – a collective approach in Southeast Asian basins. Petroleum Geoscience, 13, 127–144.
    [Google Scholar]
  3. Ghosh, D., M.Halim, M.Brewer, B.Viratno and N.Darman
    [2010] Geophysical issues and challenges in Malay and adjacent basins from an E & P perspective. The Leading Edge, 29, 436–449.
    [Google Scholar]
  4. Liu, Y., G.Chen, L.Hu, Y.Huang, M.Chang and C.Contrino
    [2014] Improving images below shallow gas clouds with adaptive data-selection FWI and Q-tomography: A case study at East Breaks, BOM. 84th Annual International Meeting, SEG, Expanded Abstracts.
    [Google Scholar]
  5. Menzel-Jones, G., J.Rndschwentner, C.H.Lim, S.Hydal and B.J.Lim
    [2015] Imaging through shallow gas: Integrating broadband acquisition, processing and high-end model building for improved imaging of deeper targets. 24th Annual International Meeting, ASEG-PESA, Expanded Abstracts.
    [Google Scholar]
  6. Ritter, G.
    [2010] Using interpretation-driven velocity model building to improve subsalt imaging. 80th Annual International Meeting, SEG, Expanded Abstracts.
    [Google Scholar]
  7. Teng, K.H., J.Zhou, X.Wu, Y.Zhou, T.Brothers, S.Bergler and C.Gibson
    [2013] Gas cloud imaging using variable-depth streamer data, a case study from offshore Brunei. 83rd Annual International Meeting, SEG, Expanded Abstracts.
    [Google Scholar]
  8. Xie, Y., K.Xin, J.Sun and C.Notfors
    [2009] 3D prestack depth migration with compensation for frequency dependent absorption and dispersion. 79th Annual International Meeting, SEG, Expanded Abstracts, 2919–2922.
    [Google Scholar]
  9. Xie, Y., J.Sun, Y.Zhang and J.Zhou
    [2015] Compensating for visco-acoustic effects in TTI reverse time migration. 85th Annual International Meeting, SEG, Expanded Abstracts.
    [Google Scholar]
  10. Xin, K., and B.Hung
    [2009] 3-D tomographic Q inversion for compensating frequency dependent attenuation and dispersion. 79th Annual International Meeting, SEG, Expanded Abstracts.
    [Google Scholar]
  11. Zhou, J., X.Wu, K.Teng, Y, Xie, F.Lefeuvre, I.Anstey and L.Sirgue
    [2014] FWI-guided Q Tomography for imaging in the presence of complex gas clouds. 76th Annual International Meeting, EAGE, Expanded Abstracts.
    [Google Scholar]
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