Summary and conclusion

GeologivurderingBHn-engelsk-ingress
06.06.2017

Expected recoverable resources in eastern parts of Barents Sea North are calculated to be 1 370 million scm oe, with a downside of 350 million scm oe (P95) and an upside of 2 460 million scm oe (P05). Possible drilling and confirmation of one or more plays will move these estimates towards the higher values. Expected recoverable resources break down into 825 million scm of fluids and 545 billion scm of gas. The fluid/gas relationship helps to distinguish the area from Barents Sea South. While gas is estimated to represent the largest proportion (60 per cent) in the south, liquids account for the biggest share (60 per cent) here.

Several possible source rocks are found in the mapped area. Their extent and generation potential, particularly for the Steinkobbe/Botneheia Formation, are regarded as favourable for hydrocarbon formation. The possibility of oil is suggested by their burial depth. Six plays have been identified, several of them with very large traps and thereby a substantial potential for reservoir volume. Retention of hydrocarbons in the traps is an important risk factor. Improved understanding of the burial history will be needed to increase knowledge of gas expansion, maturity considerations and sealing potential in the area.

Geological uncertainty in the area is relatively high, and at its highest for levels older than the Triassic. Completing the analyses of shallow boreholes could help to improve understanding of the individual reservoir levels which have been cored. In addition, more and better seismic data which permit full prospect analyses could improve understanding of the resource potential.

General experience with the petroleum sector shows that the total resource potential in an area will be dominated by resources in the biggest deposits. Translated to the eastern parts of Barents Sea North, this means that greater knowledge of the resource potential in the largest structures will be important for further evaluation of the total potential.

Given the present state of knowledge, the Barents Sea has the biggest undiscovered resource potential on the NCS. The area could therefore come to play an important role in maintaining profitable petroleum activities on the NCS for a long time to come.

 

Sources

  • http://www.npd.no/en/Publications/Resource-Reports/2016/Chapter-3/
  • http://www.npd.no/en/Topics/Geology/Lithostratigraphy/
  • Abay, T B, Karlsen, D A and Pedersen, J H, (2014): “Source Rocks at Svalbard: An Overview of Jurassic and Triassic Formations and Comparison with Offshore Barents Sea Time Equivalent Source Rock Formations”. Search and Discovery Article no 30372 (2014). Posted 13 October 2014.
  • Henriksen, E, Bjørnseth, H M, Hals, T K, Heide, T, Kiryukhina, T, Kløvjan, O S, Larssen, G B, Ryseth, A E, Rønning, K, Sollid, K and Staupakova, A (2011): “Uplift and erosion of the greater Barents Sea: impact on prospectivity and petroleum systems”. Geological Society, London, Memoirs 2011, vol 35, pp 271-281.
  • Knies, J, Matthiessen, J, Vogt, C, Laberg, J S, Hjelstuen, B O, Smelror, M, Larsen, E, Andreassen, K, Eidvin, T and Vorren, T O (2009): “The Plio-Pleistocene glaciation of the Barents Sea–Svalbard region: a new model based on revised chronostratigraphy”. Elsevier. Quaternary Science Reviews xxx (2009), pp 1–18.
  • Larssen, G B, Olaussen, S, Helland-Hansen, W, Johannesen, E P, Nøttvedt, A, Riis, F, Rismyhr, B, Smelror, M and Worsley, D (in preparation): “Upper Triassic to Lower Cretaceous strata of the Kong Karls Land archipelago, Svalbard High Arctic Norway. A key to the Mesozoic basin evaluation and resource evaluation in the northern Barents Sea”.
  • Lerch, B, Karlsen, D A, Matapour, Z, Seland, R and Backer-Owe, K (2016): “Organic geochemistry of Barents Sea petroleum: thermal maturity and alteration and mixing processes in oils and condensates”. Journal of Petroleum Geology. vol 39, issue 2 April 2016, pp 125–148.
  • Lundschien, B A, Høy, T and Mørk, A (2014): “Triassic hydrocarbon potential in the northern Barents Sea: integrating Svalbard and stratigraphic core data”. Norwegian Petroleum Directorate Bulletin, 11, pp 3–20.
  • Ohm, S E, Karlsen, D A and Austin, J F (2008): “Geochemically driven exploration models in uplifted areas: examples from the Norwegian Barents Sea”. AAPG Bulletin, vol 92, no 9 (September 2008), pp 1191-1223.
  • Ramberg, I B, Bryhni, I and Nøttvedt, A (2007): “Landet blir til”. Norsk Geologisk Foreining. Riis, F and Fjeldskaar, W (1992): “On the magnitude of the Late Tertiary and Quaternary erosion and its significance for the uplift of Scandinavia and the Barents Sea”. In Larsen, R M & Larsen, B T (eds): Structural and Tectonic Modelling and its Application to Petroleum Geology. Norwegian Petroleum Society. Graham & Trotman, London (in press).
  • Smelror, M, Petrov, O V, Larsen, G B and Werner, S (eds) (2009): Atlas — Geological History of the Barents Sea, Geological Survey of Norway, Trondheim, 135 pp.
  • Stemmerik, L, Worsley, D, (2005): “30 years on - Arctic Upper Palaeozoic stratigraphy, depositional evolution and hydrocarbon prospectivity”. Norwegian Journal of Geology/Norsk Geologisk Forening. 2005, vol 85, issue 1/2, pp 151-168.