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Abstract

Summary

Seal evaluation for CO2 storage is different from that of a hydrocarbon trap since the oil or gas accumulation itself validates the cap-rock integrity. However, in case of subsurface CO2 storage a careful investigation is required to avoid any risk of potential seal failure. The Johansen Formation of Early Jurassic age in and around the Troll field is a potential CO2 storage reservoir in the northern North Sea. It is enveloped by Amundsen mudstone, whereas in the southeast where the Amundsen cap pinches out, the Drake mudstone Formation directly overlies the Johansen Formation. We evaluated wireline log data from 24 exploration wells using petrophysical analysis and rock physics diagnostics to obtain present day depth, thickness, temperature, volume of clay, physical and elastic properties to evaluate the seal integrity of the Amundsen and Drake Formations. The sealing properties of both the formations were found to be within acceptable range, with minor presence of brittle zones at deeper levels within the Drake Formation containing low volume of shale. These findings will help understanding the seal integrity of Amundsen and Drake Formations as cap-rocks above the Johansen Sandstone being a potential CO2 storage reservoir.

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/content/papers/10.3997/2214-4609.201900793
2019-06-03
2024-03-28
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References

  1. Davis, G.H., Reynolds, S.J., Kluth, C.F. & Kluth, C.
    [2011] Structural Geology of Rocks and Regions. John Wiley & Sons.
    [Google Scholar]
  2. Fawad, M. & Mondol, N.H.
    [2018] Reservoir Characterisation of Johansen Formation as Potential CO2 Storage Reservoir in the Northern North Sea. In: Fifth CO2 Geological Storage Workshop.
    [Google Scholar]
  3. Greenberg, M.L. & Castagna, J.P.
    [1992] Shear-wave velocity estimation in porous rocks: Theoretical formulation, preliminary verification and applications. Geophysical prospecting, 40, 195–209.
    [Google Scholar]
  4. Ingram, G.M. & Urai, J.L.
    [1999] Top-seal leakage through faults and fractures: the role of mudrock properties. Geological Society, London, Special Publications, 158, 125–135.
    [Google Scholar]
  5. Larionov, V.V.
    [1969] Radiometry of boreholes. Nedra, Moscow, 127.
    [Google Scholar]
  6. NPD.
    [2019] Norwegian Petroleum Directorate Fact pages of exploration wellbores. Available from http://factpages.npd.no/factpages/.
    [Google Scholar]
  7. Perez, R. & Marfurt, K.
    [2014] Mineralogy-based brittleness prediction from surface seismic data: Application to the Barnett Shale. Interpretation, 2, T255–T271.
    [Google Scholar]
  8. Sundal, A., Nystuen, J.P., Dypvik, H., Miri, R. & Aagaard, P.
    [2013] Effects of geological heterogeneity on CO2 distribution and migration–a case study from the Johansen Formation, Norway. Energy Procedia, 37, 5046–5054.
    [Google Scholar]
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