Nitrogen Isotopic Fractionation of Crude Oil during Biodegradation

CHEN Chuan ping; MEI Bo wen

Nitrogen isotopic ratio of several oils with different physical and chemical qualities from Lengdong zone in Liaohe oil field is analyzed to understand the mechanism of nitrogen isotopic fractionation and the metabolism of nitrogen bearing compounds during biodegradation in this paper. The δ ¹⁵ N of normal oil is about 4.0‰ approaching to that of the kerogen whereas the δ ¹⁵ N of biodegraded oil increases obviously with the value close to or over 10.0‰. Moreover, the δ ¹⁵ N vary with the degree of degradation. The fact that nitrogen isotopic fractionation has occurred during the oil biodegradation suggests that nitrogen bearing organic compounds in oils be involved in the metabolism of bacteria.

Nitrogen Isotopic Fractionation of Crude Oil during Biodegradation

1. Jianghan Petroleum University, Jingzhou, Hubei 434100;

2. Huazhong University of Science and Technology, Wuhan 430074

Received Date: 2003-09-15

Rev Recd Date: 2004-06-12

Publish Date: 2004-12-10

Key words:

Abstract: Nitrogen isotopic ratio of several oils with different physical and chemical qualities from Lengdong zone in Liaohe oil field is analyzed to understand the mechanism of nitrogen isotopic fractionation and the metabolism of nitrogen bearing compounds during biodegradation in this paper. The δ ¹⁵ N of normal oil is about 4.0‰ approaching to that of the kerogen whereas the δ ¹⁵ N of biodegraded oil increases obviously with the value close to or over 10.0‰. Moreover, the δ ¹⁵ N vary with the degree of degradation. The fact that nitrogen isotopic fractionation has occurred during the oil biodegradation suggests that nitrogen bearing organic compounds in oils be involved in the metabolism of bacteria.

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Nitrogen Isotopic Fractionation of Crude Oil during Biodegradation

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