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Abstract

Summary

Rapid lateral and vertical velocity and thickness variations within Albian carbonates and Aptian evaporites in West African salt basins present considerable problems for seismic imaging and depth modelling. Failure to address these problems has effectively restricted sub-salt exploration success offshore southern Gabon, even with 3D PSDM data processing. Using new 3D data from Dussafu and employing a range of velocity model updating techniques, migration algorithms and geological data we have built a very detailed and accurate velocity model of the complex, stratified Albian carbonate layer. This enabled us to remove some of the artificial deformation evident in earlier processing at Base Salt and below, which resulted from inaccurate velocity models. This successful processing project relied upon close collaboration between the geology and geophysics teams within the operator and the geophysical contractor. This collaboration led to the careful selection of methods to develop a reliable earth model, producing clear seismic images which will be used as a basis for field development.

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/content/papers/10.3997/2214-4609.201600822
2016-05-30
2024-04-19

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References

  1. Brittan, J., and Yuan, J.
    , [2005], Dense multi-offset reflection tomography: 75th Annual International Meeting, SEG, Expanded Abstracts, 24, 2534– 2537, http://dx.doi.org/10.1190/1.2148239.
     [Google Scholar]
  2. Fruehn, J. K., Greenwood, S., Valler, V., and Sekulic, D.
    , [2014], Resolving small-scale near-seabed velocity anomalies using non-parametric autopicking and hybrid tomography, CSEG Recorder, 39, (10)
     [Google Scholar]
  3. Gill, J. and Cameron, D.
    , [2002], 3D revives an old play: An Aptian subsalt discovery, Etame Field, offshore Gabon, West Africa. Leading Edge1147–51.
     [Google Scholar]
  4. Hoetz, G., Steenbrink, J., Bekkers, N., Vogelaar, A. & Luhr, S.
    , [2011], Salt-induced stress anomalies: an explanation for variations in seismic velocity and reservoir quality. Petroleum Geoscience17, 385–396.
     [Google Scholar]
  5. Jones, I.F.
    , [2015], Estimating subsurface parameter fields for seismic migration: velocity model building, in: Encyclopedia of Exploration Geophysics. SEG, pp. U1-1–U1-24. Editors: VladimirGrechka and KeesWapenaar. http://library.seg.org/doi/pdf/10.1190/1.9781560803027.entry3
     [Google Scholar]
  6. Jones, I.F., and Davison, I.
    , [2014], Seismic imaging in and around salt bodies. SEG Interpretation, 2, no. 4, SL1–SL20.
     [Google Scholar]
  7. Teisserenc. P. & Villemin. J.
    , [1989], Sedimentary basin of Gabon – Geology and Oil Systems. Divergent / Passive Margin Basins. AAPG Memoir48, 117–199.
     [Google Scholar]
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Third Time Lucky? Imaging the Dentale Formation Offshore Gabon
Conference Proceedings 2016, 1 (2016); https://doi.org/10.3997/2214-4609.201600822
/content/papers/10.3997/2214-4609.201600822
/content/papers/10.3997/2214-4609.201600822
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