Molecular geochemical identification of hydrocarbon microleakage in the Pearl River Mouth Basin of the South China Sea

Mao Shengyi; Zhu Xiaowei; Su Ming; Guan Hongxiang; Sun Yongge; Wu Nengyou

doi:10.3969/j.issn.0253-4193.2014.08.003

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Mao Shengyi, Zhu Xiaowei, Su Ming, Guan Hongxiang, Sun Yongge, Wu Nengyou. Molecular geochemical identification of hydrocarbon microleakage in the Pearl River Mouth Basin of the South China Sea[J]. Haiyang Xuebao, 2014, 36(8): 19-29. doi: 10.3969/j.issn.0253-4193.2014.08.003

Citation:

Mao Shengyi, Zhu Xiaowei, Su Ming, Guan Hongxiang, Sun Yongge, Wu Nengyou. Molecular geochemical identification of hydrocarbon microleakage in the Pearl River Mouth Basin of the South China Sea[J]. Haiyang Xuebao, 2014, 36(8): 19-29. doi: 10.3969/j.issn.0253-4193.2014.08.003

Citation:

Mao Shengyi, Zhu Xiaowei, Su Ming, Guan Hongxiang, Sun Yongge, Wu Nengyou. Molecular geochemical identification of hydrocarbon microleakage in the Pearl River Mouth Basin of the South China Sea[J]. Haiyang Xuebao, 2014, 36(8): 19-29. doi: 10.3969/j.issn.0253-4193.2014.08.003

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Molecular geochemical identification of hydrocarbon microleakage in the Pearl River Mouth Basin of the South China Sea

doi: 10.3969/j.issn.0253-4193.2014.08.003

1.
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China
3.
Department of Geosciences, Zhejiang University, Hangzhou 310027, China

Received Date: 2013-10-11
Rev Recd Date: 2013-11-21

Abstract

Abstract

N-alkane components are studied in Site4B profile sediment from the Pearl River Mouth Basin,northern South China Sea,and the results reveal that "similar mature hydrocarbon" distribution is exhibited from 65 cm to 70 cm,80 to 85 cm and 85 cm to 90 cm below the sea floor. An unresolved complex mixture (UCM) of components dominates the gas chromatography mass spectrum (GC-MS) and high molecular weight n-alkanes trend to show no odd predominace with CPI from 1.15 to 1.45 in these layers. Meanwhile,in other layers,alkanes are characteristic of modern/recent organic matter inputs in the profile. Combined with regional geological background and the exploration of gas hydrate in this area,we may conclude that unusual distribution of alkane from 65 cm to 70 cm,80 to 85 cm and 85 cm to 90 cm below the sea floor is resulted by deep hydrocarbon microleakage.
- Pearl River Mouth Basin,
- n-alkanes,
- UCM,
- hydrocarbon seepage

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References(88)

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