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The effect of biodegradation on adamantanes in reservoired crude oils from the Bohai Bay Basin, China

Publication date:

Available online 20 June 2018

Source:Organic Geochemistry

Author(s): Xiong Cheng, Dujie Hou, Changgui Xu

The effect of biodegradation on adamantanes has been studied based on a suite of genetic related crude oils with increasing degree of biodegradation from the Miaoxi Depression, Bohai Bay Basin, China. Selectivity during biodegradation was observed for adamantanes. The relative susceptibility to biodegradation of individual adamantane compounds was determined based on their compositional changes. Adamantanes with more alkyl substituents are generally more resistant to biodegradation, but exceptions also occur. The position of alkylation has great control on the susceptibility to biodegradation of adamantanes. However, the more thermally stable compounds are not always more readily biodegraded, suggesting that the susceptibility of adamantanes is not directly controlled by thermodynamic stability. Selective biodegradation of adamantanes may be related to their stereochemical structures and demethylation could have occurred. Microbial alteration of adamantanes has negligible effect on methyladmantane index, dimethyladamantane index 1, dimethyladamantane index 2, trimethyladamantane index1 and trimethyladamantane index 2, suggesting that they could be used to evaluate the thermal maturity of biodegraded crude oils. In contrast, the ethyladmantane index was significantly altered and thus is not valid for maturity assessment for biodegraded oils.

Autoren:   Author(s): Xiong Cheng, Dujie Hou, Changgui Xu
Journal:   Organic Geochemistry
Jahrgang:   2018
Erscheinungsdatum:   24.06.2018
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