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The occurrence and significance of 25-norhopanoic acids in petroleum reservoirs

Lookup NU author(s): Dr Barry Bennett, Dr Carolyn Aitken, Dr Martin Jones, Dr Paul Farrimond, Professor Stephen Larter


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In addition to previously reported 25-norhopanoic acids with the 17α(H), 21β(H) and 17β(H), 21α(H) configurations, for the first time we report the identification of 25-norhopanoic acids bearing the 17β(H), 21β(H) configuration in a suite of heavily biodegraded oils from China. The 17β(H), 21β(H) stereochemistry is a thermally unstable biologically-derived structure, suggesting that the 17β(H), 21β(H) 25-norhopanoic acids may derive from petroleum-degrading microbes. Rather than representing a direct input, we propose that demethylation of 17β(H), 21β(H) hopanoic acids derived from bacteria in the reservoir may give rise to 17β(H), 21β(H) 25-norhopanoic acids, implying that microbial reworking of biomass is occurring alongside petroleum degradation. © 2007 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Bennett B, Aitken CM, Jones DM, Farrimond P, Larter SR

Publication type: Article

Publication status: Published

Journal: Organic Geochemistry

Year: 2007

Volume: 38

Issue: 11

Pages: 1977-1985

ISSN (print): 0146-6380

ISSN (electronic): 1873-5290


DOI: 10.1016/j.orggeochem.2007.06.011


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