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Abstract

Summary

This paper is intended to demonstrate that a new approach to the acquisition of Vertical Incidence VSPs in deviated wells can provide significantly better results with little impact on acquisition times. We designed a fitfor-purpose 2D VSP walk above acquisition using the so called “walk-along vertical incidence VSP” (WAVI-VSP) technique to deliver the key borehole seismic objectives to reduce our current subsurface uncertainties:

  • Seismic time-depth calibration
  • A high resolution “vertical incidence” image below the wellbore

A deviated exploration well in the Central North Sea encountered hydrocarbons in a thin Palaeocene sandstone reservoir and was side tracked to find the OWC. The well was drilled based on seismic amplitude direct hydrocarbon indicator (DHI) and the reservoir is below the resolution of conventional seismic. A VSP is a direct approach to achieving the broadest seismic bandwidth and can guide the optimisation of the surface seismic to resolve the reservoir.

Key questions to address:

  • Can the sand be resolved?
  • How do we best image it to guide field development decisions?
  • Is the DHI information consistent with the OWC in the well?
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/content/papers/10.3997/2214-4609.201700511
2017-06-12
2024-03-29
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References

  1. Cassellet al.
    , 1984, Cassell, B., Alam, A., and Millahn, K., 1984, Model-based interactive VSP-CDP transformation: Presented at the 54th Ann. Internat. Soc. Expl. Geophys.
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  2. OristaglioM
    : “A guide to current uses of vertical seismic profiles”, Geophysics50 (December1985): 2473–2479.
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