1887

Abstract

Summary

The Golden Eagle Area Development (GEAD) lies 90 Km NE of Aberdeen in the Moray Firth and produces oil from turbidite sands of Lower Cretaceous and Upper Jurassic age at depths around 7,000 feet. These reservoirs have modest seismic contrasts and high seismic fidelity is needed to reveal subtle character and geometries.

Seismic imaging challenges in the Moray Firth include shallow velocity anomalies from Quaternary channels, overburden layers which create strong seismic multiples, and the high velocity Upper Cretaceous chalk. At GEAD the Top Chalk is unusually deeply eroded creating a rugose, high- contrast interface.

The combination of difficult overburden and subtle seismic character mean that seismic reservoir characterisation at GEAD requires an exceptionally high quality of seismic acquisition and processing. In 2015 an ocean-bottom-node (OBN) seismic survey was acquired over GEAD with unusually dense source and receiver sampling. This high-density OBN has delivered a step change improvement in seismic image quality compared with the best towed-streamer seismic.

Processing tests allow us to assess if an equally good image could have been obtained using less dense OBN sampling. These demonstrate that, when it comes to seismic imaging in the Moray Firth, more sampling is more.

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/content/papers/10.3997/2214-4609.201900888
2019-06-03
2024-04-25
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References

  1. Bailey, T. and Dutton, D.
    [2012] An Empirical Vp/Vs Shale Trend for the Kimmeridge Clay of the Central North Sea. 74th EAGE Conference and Exhibition, Extended Abstracts F024.
    [Google Scholar]
  2. Bouska, J.
    [2008] Advantages of wide-patch, wide-azimuth ocean-bottom seismic reservoir surveillance. The Leading Edge, 27(12), 1662–1681.
    [Google Scholar]
  3. Jones, I.F.
    [2013] Tutorial: the seismic response to strong vertical velocity change. First Break, 31(6), 79–90
    [Google Scholar]
  4. Kristensen, T.B. and Huuse, M.
    [2012] Multistage erosion and infill of buried Pleistocene tunnel valleys and associated seismic velocity effects. Geological Society, London, Special Publications, 368, 159–172.
    [Google Scholar]
  5. Ourabah, A., Keggin, J., Brooks, C., Ellis, D. and Etgen, J.
    [2015] Seismic Acquisition, what really matters?85th SEG Annual International Meeting, Expanded Abstracts, 6–11.
    [Google Scholar]
  6. Pinnock, S.J. and Dutton, D.
    [in press] The Golden Eagle Area Development, Blocks 14/26a and 20/01, UK North Sea. In: United Kingdom Oil and Gas Field (third edition). Gluyas, J. and Goffey, G. (main editors). (London: The Geological Society of London).
    [Google Scholar]
  7. Vermeer, G.J.O.
    [2001] Processing with offset-vector-tile gathers. 63rd EAGE Conference & Exhibition, Extended Abstracts A38.
    [Google Scholar]
  8. Wiarda, E.J.
    [2015] Resolving Near-seabed Complexity and Tertiary Stratigraphy in the Inner Moray Firth Basin Using Full-waveform Inversion. 77th EAGE Conference and Exhibition, Extended Abstracts N104.
    [Google Scholar]
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