Petroleum geochemistry of the deepened Lopra-1/1A re-entry well, Faroe Islands

Authors

  • Jørgen A. Bojesen-Koefoed Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
  • H. Peter Nytoft Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

DOI:

https://doi.org/10.34194/geusb.v9.4860

Keywords:

oil traces, organic geochemistry, contamination, Faroes, North Atlantic, Lopra

Abstract

The Lopra-1/1A re-entry well was drilled as a stratigraphic test with no immediate exploration objectives. Hence, petroleum geochemical studies were of limited extent, and restricted to non-destructive analyses. The presence of natural petroleum hydrocarbons could not be confirmed with certainty, but hydrocarbons extracted from the hydrochloric acid solute of a calcite vug present in RSWC #1 (3543 m), may represent indigenous petroleum since hydrocarbon-bearing fluid inclusions have been reported from the same sample. These hydrocarbons show some similarities to petroleum generated from the Upper Jurassic – Lower Cretaceous Kimmeridge Clay type source rocks present in surrounding areas. Except for this sample, the results generally show the presence of a variety of contaminants of different origins such as ‘naturally greasy fingers’ (squalene and cholesterol), cosmetics such as chap stick or hand lotion (e.g. esters such as butyl-stearate, stearyl-palmitate, vitamin A), plasticisers (phthalates), diesel oil and ‘pipe dope’.

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Published

2006-05-31

How to Cite

Bojesen-Koefoed, J. A. ., & Nytoft, H. P. . (2006). Petroleum geochemistry of the deepened Lopra-1/1A re-entry well, Faroe Islands. GEUS Bulletin, 9, 67–77. https://doi.org/10.34194/geusb.v9.4860

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