Directory UMM :Data Elmu:jurnal:O:Organic Geochemistry:Vol32.Issue1.2001:
Organic Geochemistry 32 (2001) 87±103
www.elsevier.nl/locate/orggeochem
Carbon isotopic composition of an isoprenoid-rich oil
and its potential source rock
Richard D. Pancost a,1, Nils Telnñs b, Jaap S. Sinninghe Damste a,*
a
Department of Marine Biogeochemistry and Toxicology, Netherlands Institute for Sea Research, PO Box 59,
1790AB Den Burg (Texel), The Netherlands
b
Norsk Hydro Research Center, Sandsliveien 90, N-5020 Bergen, Norway
Received 2 June 2000; accepted 4 October 2000
(returned to author for revision 3 August 2000)
Abstract
Despite the multiple controls on the carbon isotopic composition of organic matter, 13C values for saturated and
aromatic hydrocarbon fractions for over 300 Norwegian North Sea (Central Graben) oils range from ÿ26 to ÿ31%
and from ÿ24 to ÿ30%, respectively. However, for one oil (well 2/2-5), 13C values for the saturate and aromatic
fractions are ÿ21.5% and ÿ22%, signi®cantly enriched in 13C relative to the isotopic compositions of all oil fractions
investigated. The saturate hydrocarbon fraction of the 2/2-5 oil is comprised predominantly of low-molecular-weight
(
www.elsevier.nl/locate/orggeochem
Carbon isotopic composition of an isoprenoid-rich oil
and its potential source rock
Richard D. Pancost a,1, Nils Telnñs b, Jaap S. Sinninghe Damste a,*
a
Department of Marine Biogeochemistry and Toxicology, Netherlands Institute for Sea Research, PO Box 59,
1790AB Den Burg (Texel), The Netherlands
b
Norsk Hydro Research Center, Sandsliveien 90, N-5020 Bergen, Norway
Received 2 June 2000; accepted 4 October 2000
(returned to author for revision 3 August 2000)
Abstract
Despite the multiple controls on the carbon isotopic composition of organic matter, 13C values for saturated and
aromatic hydrocarbon fractions for over 300 Norwegian North Sea (Central Graben) oils range from ÿ26 to ÿ31%
and from ÿ24 to ÿ30%, respectively. However, for one oil (well 2/2-5), 13C values for the saturate and aromatic
fractions are ÿ21.5% and ÿ22%, signi®cantly enriched in 13C relative to the isotopic compositions of all oil fractions
investigated. The saturate hydrocarbon fraction of the 2/2-5 oil is comprised predominantly of low-molecular-weight
(