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Despite the multiple controls on the carbon isotopic composition of organic matter, δ 13 C values for saturated and aromatic hydrocarbon fractions for over 300 Norwegian North Sea (Central Graben) oils range from −26 to −31‰ and from −24 to −30‰, respectively. However, for one oil (well 2/2-5), δ 13 C values for the saturate and aromatic fractions are −21.5‰ and −22‰, significantly...
Analysis of the pyrolysis products of several marine kerogens revealed that the stable carbon isotopic composition of the n-alkanes (C 10 –C 25 ) are quite similar to those of the n-alkenes. This suggests that they have a common origin such as algal biopolymers. The isoprenoid alkanes (C 13 –C 20 ) also have similar isotopic compositions but can differ significantly...
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