Sulphur-containing compounds in sulphur-rich crude oils from hypersaline lake sediments and their geochemical implications |
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| Authors: | Guoying Sheng Jiamo Fu S C Brassell A P Gowar G Eglinton Jaap S Sinninghe Damste Jan W de Leeuw P A Schenck |
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| Institution: | (1) Institute of Geochemistry, Academia Sinica, China;(2) Organic Geochemistry Unit, School of Chemistry, University of Bristol, Bristol, U.K.;(3) Organic Geochemistry Unit, Department of Chemistry and Chemical Engineering, Delft University of Technology, Delft, The Netherlands |
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| Abstract: | Three sulphur-rich commercial crude oils have been studied, which contain sulphur as high as up to 4–12%. These samples were
collected from Tertiary hypersaline lake sediments of the Jianghan Basin, Hubei Province at different depths, but above the
oil generation threshold (2200m). FPD-GC and GC-MS data show that aromatic fractions of the crude oils are composed of different
homologues of sulphur-containing compounds, including long-chain normal alkyl-thiophenes and-thiolanes, long-chain isoprenoid-thiophenes
and -thiolanes, and benzothiophenes. It is worth noting that the distribution patterns of long-chain alkyl-thiophenes and
-thiolanes from two shallow-seated crude oils are quite similar to those of normal alkanes showing marked even-odd predominance.
It seems that the even-odd predominance of sulphur-containing compounds decreases with increasing burial depth of the crude
oils. The major component of aliphatic fraction is phytane, and similarly the major peaks of aromatic fractions also represent
C20 isoprenoid thiophenes.
Some preliminary conclusions have been drawn from the above discussion: (1) Abundant sulphur-containing compounds may be used
as an indicator of low mature or immature crude oils produced from hypersaline lake sediments; (2) Sulphur-containing compounds
are considered to be early diagenetic products of reactions between elemental sulphur or sulfides and alkanes or their precursors
(phytols, fatty acids, alcohols, etc.), or of bacterial activities, but not direct inputs of organisms. |
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