Upper Palaeozoic carbonate reservoirs on the Norwegian Arctic Shelf; delineation of reservoir models with application to the Loppa High

Lars Stemmerik, Geir Elvebakk, David Worsley

Research output: Contribution to journalArticleResearchpeer-review

40 Citations (Scopus)

Abstract

The reservoir potential of the Upper Palaeozoic carbonates in the Barents Sea area is primarily controlled by early diagenetic processes. Upper Bashkirian to Asselian shallow platform carbonates deposited in warm, arid to semi-arid climates were dominated by aragonitic organisms and mineralogically unstable aragonite and high-Mg calcite cements and mud. A reservoir model for these carbonates involves extensive dolomitization and dissolution of metastable carbonate during repeated subaerial exposure. The reservoir model is confirmed by drilling and is accordingly regarded as low risk. Artinskian and Upper Permian shallow water carbonates deposited in a cold temperate climate were dominated by calcitic organisms and silica sponges, and associated with calcite cements and mud and chert. A reservoir model for these carbonates involves either preservation of primary porosity in carbonate build-ups or extensive dissolution of build-up marine cement during prolonged subaerial exposure. This model is not confirmed by drilling and is regarded as high risk.

Original languageEnglish
Pages (from-to)173-187
Number of pages15
JournalPetroleum Geoscience
Volume5
Issue number2
DOIs
Publication statusPublished - May 1999

Keywords

  • Barents Sea
  • Carbonate diagnesis
  • Carbonate reservoir
  • Carboniferous
  • Permian

Programme Area

  • Programme Area 3: Energy Resources

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