| 南海北部莺歌海岭头岬近岸烃类渗漏喷口分布及气体地球化学 |
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| 引用本文： | 邸鹏飞,冯东,陈多福.南海北部莺歌海岭头岬近岸烃类渗漏喷口分布及气体地球化学[J].海洋学报(英文版),2016,35(11):120-125. |
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| 作者姓名： | 邸鹏飞 冯东 陈多福 |
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| 作者单位： | 中国科学院 南海海洋研究所 边缘海地质重点实验室, 广东广州 510301,中国科学院 南海海洋研究所 边缘海地质重点实验室, 广东广州 510301,中国科学院 南海海洋研究所 边缘海地质重点实验室, 广东广州 510301;上海深渊科学工程技术研究中心, 上海海洋大学海洋科学学院, 上海 201306 |
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| 摘 要： | Natural hydrocarbon seeps in a marine environment are one of the important contributors to greenhouse gases in the atmosphere,including methane,which is significant to the global carbon cycling and climate change.Four hydrocarbon seep areas,the Lingtou Promontory,the Yinggehai Rivulet mouth,the Yazhou Bay and the Nanshan Promontory,occurring in the Yinggehai Basin delineate a near-shore gas bubble zone.The gas composition and geochemistry of venting bubbles and the spatial distribution of hydrocarbon seeps are surveyed on the near-shore Lingtou Promontory.The gas composition of the venting bubbles is mainly composed of CO_2,CH_4,N_2 and O_2,with minor amounts of non-methane hydrocarbons.The difference in the bubbles' composition is a possible consequence of gas exchange during bubble ascent.The seepage gases from the seafloor are characterized by a high CO_2 content(67.35%) and relatively positive δ~(13)C_(V_PDB) values(-0.49×10~(-3)-0.86×10~(-3)),indicating that the CO_2 is of inorganic origin.The relatively low CH_4 content(23%) and their negative δ~(13)C_(V-PDB) values(-34.43×10~(-3)--37.53×10~(-3)) and high ratios of C_1 content to C_(1-5) one(0.98-0.99)as well point to thermogenic gases.The hydrocarbon seeps on the 3.5 Hz sub-bottom profile display a linear arrangement and are sub-parallel to the No.1 fault,suggesting that the hydrocarbon seeps may be associated with fracture activity or weak zones and that the seepage gases migrate laterally from the central depression of the Yinggehai Basin.
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| 关 键 词： | 烃类渗漏 气体组成 分布 莺歌海近岸 南海北部 |
| 收稿时间： | 8/5/2015 12:00:00 AM |
| 修稿时间： | 2016/6/14 0:00:00 |
The distribution and variation in the gas composition of macro-seeps on the near-shore Lingtou Promontory in the South China Sea |
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| DI Pengfei,FENG Dong and CHEN Duofu.The distribution and variation in the gas composition of macro-seeps on the near-shore Lingtou Promontory in the South China Sea[J].Acta Oceanologica Sinica,2016,35(11):120-125. |
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| Authors: | DI Pengfei FENG Dong and CHEN Duofu |
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| Institution: | 1.Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China2.Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China |
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| Abstract: | Natural hydrocarbon seeps in a marine environment are one of the important contributors to greenhouse gases in the atmosphere, including methane, which is significant to the global carbon cycling and climate change. Four hydrocarbon seep areas, the Lingtou Promontory, the Yinggehai Rivulet mouth, the Yazhou Bay and the Nanshan Promontory, occurring in the Yinggehai Basin delineate a near-shore gas bubble zone. The gas composition and geochemistry of venting bubbles and the spatial distribution of hydrocarbon seeps are surveyed on the near-shore Lingtou Promontory. The gas composition of the venting bubbles is mainly composed of CO2, CH4, N2 and O2, with minor amounts of non-methane hydrocarbons. The difference in the bubbles’ composition is a possible consequence of gas exchange during bubble ascent. The seepage gases from the seafloor are characterized by a high CO2 content (67.35%) and relatively positive δ 13CV-PDB values (–0.49×10–3–0.86×10–3), indicating that the CO2 is of inorganic origin. The relatively low CH4 content (23%) and their negative δ 13CV-PDB values (–34.43×10–3—–37.53×10–3) and high ratios of C1 content to C1–5 one (0.98–0.99) as well point to thermogenic gases. The hydrocarbon seeps on the 3.5 Hz sub-bottom profile display a linear arrangement and are sub-parallel to the No. 1 fault, suggesting that the hydrocarbon seeps may be associated with fracture activity or weak zones and that the seepage gases migrate laterally from the central depression of the Yinggehai Basin. |
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| Keywords: | hydrocarbon seeps gas composition distribution nearshore Yinggehai northern South China Sea |
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