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Open fractures in pre-salt silicified carbonate reservoirs in block BM-C-33, the Outer Campos Basin, offshore Brazil

View ORCID ProfileO. P. Wennberg, G. McQueen, P. H. Vieira de Luca, F. Lapponi, View ORCID ProfileD. Hunt, A. S. Chandler, A. Waldum, View ORCID ProfileG. Nery Camargo, E. Castro and L. Loures
Petroleum Geoscience, 27, petgeo2020-125, 28 May 2021, https://doi.org/10.1144/petgeo2020-125
O. P. Wennberg
1Research and Technology, Equinor ASA, Sandsliveien 90, 5254 Sandsli, Bergen, Norway
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  • ORCID record for O. P. Wennberg
  • For correspondence: [email protected]
G. McQueen
1Research and Technology, Equinor ASA, Sandsliveien 90, 5254 Sandsli, Bergen, Norway
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P. H. Vieira de Luca
2Exploration Assets Americas, Repsol, 2455 Technology Forest Boulevard, The Woodlands, TX 77381, USA
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F. Lapponi
1Research and Technology, Equinor ASA, Sandsliveien 90, 5254 Sandsli, Bergen, Norway
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D. Hunt
1Research and Technology, Equinor ASA, Sandsliveien 90, 5254 Sandsli, Bergen, Norway
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  • ORCID record for D. Hunt
A. S. Chandler
3Research and Technology, Equinor ASA, Forusbeen 50, 4035 Stavanger, Norway
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A. Waldum
4Exploration, Equinor ASA, Arkitekt Ebbells veg 10, 7053 Ranheim, Trondheim, Norway
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G. Nery Camargo
5Petróleo Brasileiro S.A. – Petrobras, Avenida República do Chile 65, Centro, Rio de Janeiro, RJ 20035-900, Brazil
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E. Castro
6Equinor ASA, Rua do Russel 804, Glória, Rio de Janeiro, RJ 22.210-010, Brazil
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L. Loures
6Equinor ASA, Rua do Russel 804, Glória, Rio de Janeiro, RJ 22.210-010, Brazil
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Abstract

Natural open fractures are present in sidewall cores and in whole-core samples from pre-salt reservoirs in the licence block BM-C-33 in the Campos Basin, Brazil. Open fractures are also observed in borehole image logs, and fracture densities are in general high. The highest density of open fractures is seen in the damage zones above and below larger cavities (amalgamated cavern damage zones (ACDZs)). Outside the ACDZs the fracture density is high in silicified carbonates, where it tends to increase with decreasing porosity. Clean dolomites are less fractured than the silicified interval, while the less brittle argillaceous dolomites have the lowest fracture density. Some fractures appear vuggy on borehole image logs, and fracture densities are high close to vugs and larger cavities. The positive correlation between fractures and vugs is caused by flow of dissolving fluids through open fractures, and fracturing at stress concentrations around vugs. Two major fault zones have been interpreted from borehole image logs that have damage zones with very high fracture density. The well-test permeability is much greater than the matrix permeability estimated from sidewall core and log measurements. This excess permeability is attributed to fractures, in combination with caverns and intervals with frequent vugs.

  • © 2021 The Author(s). Published by The Geological Society of London for GSL and EAGE. All rights reserved
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Petroleum Geoscience: 27 (4)
Petroleum Geoscience
Volume 27, Issue 4
November 2021
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Open fractures in pre-salt silicified carbonate reservoirs in block BM-C-33, the Outer Campos Basin, offshore Brazil

O. P. Wennberg, G. McQueen, P. H. Vieira de Luca, F. Lapponi, D. Hunt, A. S. Chandler, A. Waldum, G. Nery Camargo, E. Castro and L. Loures
Petroleum Geoscience, 27, petgeo2020-125, 28 May 2021, https://doi.org/10.1144/petgeo2020-125
O. P. Wennberg
1Research and Technology, Equinor ASA, Sandsliveien 90, 5254 Sandsli, Bergen, Norway
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for O. P. Wennberg
  • For correspondence: [email protected]
G. McQueen
1Research and Technology, Equinor ASA, Sandsliveien 90, 5254 Sandsli, Bergen, Norway
  • Find this author on Google Scholar
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P. H. Vieira de Luca
2Exploration Assets Americas, Repsol, 2455 Technology Forest Boulevard, The Woodlands, TX 77381, USA
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F. Lapponi
1Research and Technology, Equinor ASA, Sandsliveien 90, 5254 Sandsli, Bergen, Norway
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D. Hunt
1Research and Technology, Equinor ASA, Sandsliveien 90, 5254 Sandsli, Bergen, Norway
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  • ORCID record for D. Hunt
A. S. Chandler
3Research and Technology, Equinor ASA, Forusbeen 50, 4035 Stavanger, Norway
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A. Waldum
4Exploration, Equinor ASA, Arkitekt Ebbells veg 10, 7053 Ranheim, Trondheim, Norway
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G. Nery Camargo
5Petróleo Brasileiro S.A. – Petrobras, Avenida República do Chile 65, Centro, Rio de Janeiro, RJ 20035-900, Brazil
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for G. Nery Camargo
E. Castro
6Equinor ASA, Rua do Russel 804, Glória, Rio de Janeiro, RJ 22.210-010, Brazil
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L. Loures
6Equinor ASA, Rua do Russel 804, Glória, Rio de Janeiro, RJ 22.210-010, Brazil
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Open fractures in pre-salt silicified carbonate reservoirs in block BM-C-33, the Outer Campos Basin, offshore Brazil

O. P. Wennberg, G. McQueen, P. H. Vieira de Luca, F. Lapponi, D. Hunt, A. S. Chandler, A. Waldum, G. Nery Camargo, E. Castro and L. Loures
Petroleum Geoscience, 27, petgeo2020-125, 28 May 2021, https://doi.org/10.1144/petgeo2020-125
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