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High molecular weight aromatic nitrogen and other novel hopanoid-related compounds in crude oils

Lookup NU author(s): Thomas Oldenburg, Haiping Huang, Paul Donohoe, Professor Stephen Larter

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Abstract

Aromatic nitrogen and other novel hopanoid-related compounds were tentatively identified in biodegraded crude oils from the Liaohe Basin, NE China. They include naphthohopanes, pyridino-, quinolino-, acridino- or benzoquinolino-, and naphthoquinolinohopanes. The nitrogen-containing hopanoids occur in substantial quantities in the biodegraded oils, with around 14 ppm of a single compound of the pyridino- and quinolinohopanoids, whereas the compounds with more rings, acridino- or benzoquinolino- and naphthoquinolinohopanes, are much less abundant, with a maximum concentration less than 2 ppm and 1 ppm, respectively. These novel highly cyclised compound series may be viewed as representatives of new classes of components whose natural distribution and biogeochemical significance remain to be determined, although the possibility of diagenetic modification of known hopane precursors (as known for sulfur-containing hopanoids) cannot be ruled out. Alternatively, inorganic nitrogen (ammonium ion) which is abundant in oil field waters, sourced by clay water equilibria, could be incorporated into biohopanoids to lead to these novel compound classes. In addition, hopanes and hopanoic acids were detected up to C40 and C37, respectively, as were as the common aromatic benzohopanes. These biodegraded oils are strongly enriched in hopanoids, with contents of the aliphatic hopanes up to 6.3% of the whole oil. © 2004 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Oldenburg TBP, Huang H, Donohoe P, Willsch H, Larter SR

Publication type: Article

Publication status: Published

Journal: Organic Geochemistry

Year: 2004

Volume: 35

Issue: 6

Pages: 665-678

Print publication date: 01/06/2004

ISSN (print): 0146-6380

ISSN (electronic): 1873-5290

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/j.orggeochem.2004.02.005

DOI: 10.1016/j.orggeochem.2004.02.005

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