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Characterization of dense zones within the Danian chalks of the Ekofisk Field, Norwegian North Sea

M. Gennaro, J.P. Wonham, G. Sælen, F. Walgenwitz, B. Caline and O. Faÿ-Gomord
Petroleum Geoscience, 19, 39-64, 1 February 2013, https://doi.org/10.1144/petgeo2012-013
M. Gennaro
1Geological Institute, University of Bergen, Allégt. 41, N-5007 Bergen, Norway
5Present address: ConocoPhillips, Ekofiskveien, 4064 Stavanger, Norway
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  • For correspondence: matteo.gennaro@conocophillips.com
J.P. Wonham
2Total Norge A.S., Dusavika, 4029 Stavanger, Norway
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G. Sælen
1Geological Institute, University of Bergen, Allégt. 41, N-5007 Bergen, Norway
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F. Walgenwitz
3Total France E&P, Larribau, 64018 Pau, France
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B. Caline
3Total France E&P, Larribau, 64018 Pau, France
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O. Faÿ-Gomord
4Département des Sciences de la Terre, Université Paris-Sud 11, Orsay, France
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Abstract

The Ekofisk Field is a giant field which has been producing at a high level for more than forty years and, since 1987, this production has taken place with the support of sea-water injection. The Danian-aged chalk deposits of the Ekofisk Formation and the Maastrichtian Tor Formation form the main reservoir units in the Ekofisk Field. The Ekofisk Formation principally consists of porous resedimented chalks intercalated with relatively thin and lower porosity beds, called dense zones. A multi-scale study of dense zones, from scanning electron microscopy to wells and seismic impedance data, has allowed the characterization and mapping of these deposits. Five main dense zone lithotypes have been identified: (1) argillaceous chalk; (2) chalk with abundant flint nodules; (3) chalk beds cemented with silica/nano-quartz; (4) calcite-cemented chalk; and (5) stylolitized chalk. The different types of dense zones tend to cluster in certain stratigraphic intervals, such as the EE and EM reservoir units at the base and in the middle part of the Ekofisk Formation. Dense zones have different mechanical properties compared to porous chalks and, depending on the connectivity of their fracture networks, they can act as preferential conduits or baffles for the reservoir fluids. An increased understanding of the distribution, characteristics and geological factors at the origin of the dense zones is fundamental to better define the reservoir architecture and ultimately identify unswept zones for future infill drilling targets.

Supplementary material Descriptions of analytical procedures, composition, poro-perm and well log values of dense zone samples is available at: www.geolsoc.org.uk/SUP18573.

  • © 2013 EAGE/Geological Society of London
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Petroleum Geoscience: 19 (1)
Petroleum Geoscience
Volume 19, Issue 1
February 2013
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Characterization of dense zones within the Danian chalks of the Ekofisk Field, Norwegian North Sea

M. Gennaro, J.P. Wonham, G. Sælen, F. Walgenwitz, B. Caline and O. Faÿ-Gomord
Petroleum Geoscience, 19, 39-64, 1 February 2013, https://doi.org/10.1144/petgeo2012-013
M. Gennaro
1Geological Institute, University of Bergen, Allégt. 41, N-5007 Bergen, Norway
5Present address: ConocoPhillips, Ekofiskveien, 4064 Stavanger, Norway
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: matteo.gennaro@conocophillips.com
J.P. Wonham
2Total Norge A.S., Dusavika, 4029 Stavanger, Norway
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
G. Sælen
1Geological Institute, University of Bergen, Allégt. 41, N-5007 Bergen, Norway
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
F. Walgenwitz
3Total France E&P, Larribau, 64018 Pau, France
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B. Caline
3Total France E&P, Larribau, 64018 Pau, France
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  • Search for this author on this site
O. Faÿ-Gomord
4Département des Sciences de la Terre, Université Paris-Sud 11, Orsay, France
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Characterization of dense zones within the Danian chalks of the Ekofisk Field, Norwegian North Sea

M. Gennaro, J.P. Wonham, G. Sælen, F. Walgenwitz, B. Caline and O. Faÿ-Gomord
Petroleum Geoscience, 19, 39-64, 1 February 2013, https://doi.org/10.1144/petgeo2012-013
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