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The identification of crocetane in Australian crude oils

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Authors
Barber, Cindy
Grice, Kliti
Bastow, Trevor
Alexander, Robert
Kagi, Robert
Date
2001
Type
Journal Article

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Barber, Cindy and Grice, Kliti and Bastow, Trevor and Alexander, Robert and Kagi, Robert. 2001. The identification of crocetane in Australian crude oils. Organic Geochemistry. 32 (7): pp. 943-947.
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Organic Geochemistry
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School of Science and Computing
Faculty of Science and Engineering
Department of Applied Chemistry
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Journal home page at: https://www.journals.elsevier.com/organic-geochemistry. Copyright © 2001 Elsevier B.V. All rights reserved.

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Abstract

AbstractThe C20 irregular isoprenoid crocetane (2,6,11,15-tetramethylhexadecane) has been unambiguously identified in a series of Western Australian crude oils from the Canning (Ordovician/Devonian) and Perth (Lower Triassic) Basins. PMI (2,6,10,15,19-pentamethylicosane) was found to co-occur with crocetane in the same samples. In addition, a newly observed series of C22-C24 irregular isoprenoids possessing the same carbon skeleton have also been tentatively identified in each of these crude oils on the basis of GC retention times and mass spectral characteristics. This may indicate a source for crocetane, in the Canning and Perth Basin crude oils, from the diagenesis of PMI. The stable carbon isotopiccomposition for combined crocetane/phytane in these samples suggests crocetane is not unusually depleted in 13C compared with all previous reports. This is the first reported occurrence of biomarkers attributable to methanogenic archaea in crude oils.