In 2017, BP with coventurers acquired an ultra-high-density Ocean Bottom Nodes (OBN) survey as a 4D baseline for Clair Ridge, the second phase of development of the Clair field. The acquisition density of the 100x50m receiver spacing and 25x25m shot spacing survey was a step change in BP's North Sea ocean bottom acquisition for 4D surveillance. It was expected that the increase in acquisition density, both in terms of absolute fold, and offset and azimuth coverage, would improve the 3D image quality and seismic attribute reliability. The uplift in the final PP and converted wave PS stacks has exceeded expectations and has had a significant impact on the quality and speed of interpretation of the entire section from the shallow overburden to the reservoir. The quality of gathers and the accuracy of the measured AVO response provides an excellent opportunity to pursue reliable reservoir property prediction and early velocity anisotropy products also look promising for estimating fracture azimuth. The substantial uplift in the 3D dataset will significantly impact the static description of the reservoir and the understanding of how future flood fronts are likely to develop across the field.


Article metrics loading...

Loading full text...

Full text loading...


  1. Ball, M., Mathieson, A. and Soulas, S.
    [2017], The Evolution of Life of Field Seismic Data on the Clair Field, First EAGE Workshop on Practical Reservoir Monitoring, Amsterdam.
    [Google Scholar]
  2. Bullock, A.D., Aviles, J., Leone, C.
    [2019] Simultaneous PP-PS density inversion at Clair Ridge. Submitted to 81st EAGE Conference & Exhibition.
    [Google Scholar]
  3. Davies, D. M. D., Mannaerts, H. C., McGarrity, J., Ibram, M., McKenzie, C., Campbell, S., Van Gestel, J.-P.
    [2011] High-Density OBC-A Step Change in Reservoir Imaging-A BP North Sea View. Society of Petroleum Engineers. doi: 10.2118/146144‑MS.
    https://doi.org/10.2118/146144-MS [Google Scholar]
  4. Narayanasamy, R., Barr, D., and Milne, A.
    [2009] Wellbore Instability Predictions Within the Cretaceous Mudstones, Clair Field, West of Shetlands. Society of Petroleum Engineers, doi: 10.2118/124464‑MS.
    https://doi.org/10.2118/124464-MS [Google Scholar]
  5. Robertson, A.G., Ball, M., Costaschuk, J., Davidson, J., Guliyev, N., Kennedy, B., Leighton, C., Nash, T., Nicholson, H.
    , [2019] The Clair Field, A Giant Hydrocarbon Accumulation (Blocks 206/7a, 206/8, 206/9a, 206/12a and 206/13a) UK Atlantic Margin. In: G.Goffey and J.G.Gluyas eds. 50th Year Anniversary Commemorative Memoir of UK Oil and Gas Fields. Geological Society, London, Memoirs, 2019. In preparation.
    [Google Scholar]
  6. Tillotson, P., Davies, D., Wang, L., Ball, M., Toomey, A. and L'heureux, E.
    [2018]. Extraction of azimuthal anisotropy parameters from a field scale ocean bottom seismic elastic finite difference study. 80th EAGE Conference & Exhibition, Extended Abstracts.
    [Google Scholar]
  7. Tillotson, P., Davies, D.M.D., Ball, M., Smith, L.K.
    [2019]. Clair Ridge: Learnings from processing the densest OBN survey in the UKCS. Submitted to 81st EAGE Conference & Exhibition.
    [Google Scholar]

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error