High molecular weight (C35 +) n-alkanes of Neogene heavily biodegraded oil in the Qianmiqiao region, North China |
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Authors: | Tieguan Wang Dan Zhu Zhihuan Zhang Hong Lu Chiyin Yang |
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Affiliation: | (1) Key Laboratory of Petroleum Entrapment Mechanism of the Ministry of Education, University of Petroleum, 102200 Beijing, China;(2) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China;(3) Geological Research Institute, Dagang Oilfield (Group) Co. Ltd., 300280 Tianjin, China |
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Abstract: | With wax content of 1.62%, heavy oil has been produced from the sandstone reservoirs of Neogene Guantao Formation (Ng1III). In the GC and GC-MS RIC profiles of its aliphatic fraction, n-alkanes are totally lost, which shows the result of heavy biodegradedation. However, the remaining trace C13–C36 n-alkanes can be still seen from its m/z 85 mass chromatogram. In addition, a complete series of C35–C73 high molecular weight (HMW) n-alkanes was detected by high-temperature gas chromatography (HTGC). The HMW n-alkane series shows a normal distribution pattern, a major peak at nC43, obvious odd-carbon-number predominance, CPI37–55 and OEP45–49 values up to 1.17 and 1.16–1.20 respectively. The present study not only has conformed the strong resistibility of HMW n-alkanes to biodegradation in crude oils as concluded by previous researchers, but also has provided some significant information on source input and maturity for the heavily biodegraded oil in the Qianmiqiao region. |
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Keywords: | biodegradation heavy oil high-temperature gas chromatography (HTGC) high molecular weight (HMW) wax fraction HMW n-alkane |
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