1887

Abstract

Summary

Hydraulic top seal failure is one of the crucial elements of every working prospect in the Central North Sea that are subject to HP/HT conditions. In the Danish Central Graben, Jurassic and Lower Cretaceous sections of the Danish Central Graben consistently have pore pressures >900 bars and formation temperatures can be up to >150°C. In order to improve the understanding of the pressure regime in the Danish Central Graben, a workflow to map aquifer seal capacity was employed. The aim was to assess the magnitude of effective stress and hence the risk of hydraulic top seal failure. The dataset included 30 wells distributed across the Danish side of the Central Graben, for which key pressure characteristics, as well as vertical and lateral compartmentalization were evaluated. Using these information effective stress maps were calculated for several Jurassic and Lower Cretaceous intervals. The Danish wells included in this current study fit this regionally defined trend implying that overpressure magnitude has some impact on the presence of hydrocarbon prospectivity.

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/content/papers/10.3997/2214-4609.201800914
2018-06-11
2024-03-28
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References

  1. Andsbjerg, J. and Dybkjær, K.
    [2003]. Sequence stratigraphy of the Jurassic of the Danish Central Graben. In: Geological Survey of Denmark and Greenland Bulletin, 1, 265–300.
    [Google Scholar]
  2. Gaarenstroom, L., Tromp, R. A. J., de Jong, M.C. and Bradenberg, A.M.
    [1993]. Overpressures in the Central North Sea: Implications for trap integrity and drilling safety. In: Parker, J.R., (ed.), Petroleum Geology of NW Europe. Proceeding of the 4th Petroleum Geology Conference, Geological Society of London, 1305–1313.
    [Google Scholar]
  3. Green, S. et al.
    [2016]. The influence of pore pressure in assessing hydrocarbon prospectivity: a review. First Break34 (5), 91–97.
    [Google Scholar]
  4. Ikon Science/IHS/PGS
    Ikon Science/IHS/PGS [2010]. North Sea Central Graben Pressure Study Phase 2. Non-proprietary study by IKON Science and HIS Global, unpublished.
    [Google Scholar]
  5. Møller, J.J. and Rasmussen, E.S.
    [2003]. Middle Jurassic — Early Cretaceous rifting of the Danish Central Graben. In: Geological Survey of Denmark and Greenland Bulletin, 1, 247–264.
    [Google Scholar]
  6. Swarbrick, R.E. and Osborne, M.J.
    [1998]. Mechanisms that generate abnormal pressures: an overview. In: Law, B.E., G.F.Ulmishek, and V.I.Slavin (eds.), Abnormal pressures in hydrocarbon environments: AAPGMemoir70, p.13–34.
    [Google Scholar]
  7. Teige, G.M.G. et al.
    [2005]. Capillary resistance and trapping of hydrocarbons: a laboratory Experiment. Petroleum Geoscience, 11 (2), 125–129.
    [Google Scholar]
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