| 南海中部近代沉积物中烃类气体的地球化学特征及其来源 |
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| 引用本文： | 林卫东,沈平,徐永昌,周永章.南海中部近代沉积物中烃类气体的地球化学特征及其来源[J].沉积学报,2005,23(1):170-174. |
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| 作者姓名： | 林卫东 沈平 徐永昌 周永章 |
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| 作者单位： | 中山大学地球环境与地球资源研究中心,广州,510275;中国科学院兰州地质研究所,兰州,730000 |
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| 摘 要： | 测试了 37个南海中部北部、南部陆坡以及深海平原表层近代沉积物中的烃类气体的组成和 14个样品的甲烷碳同位素组成,北部陆坡区甲烷的归一化平均含量 94%,南部陆坡区 91%,深海平原 95%,重烃含量分布在 0 ~20%,总体平均为 9%,甲烷的碳同位素陆坡区为-30‰~-40‰,深海平原区在-24‰到-36‰之间。陆坡区烃类气体主要为热成因气,深海平原中的烃类气体可能由与火山活动有关的有机成因气以及通过断裂到达海洋表层沉积物的无机成因气组成。
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| 关 键 词： | 南海中部 陆坡 深海平原 近代沉积物 气体地球化学 热成因烃类气体 |
| 文章编号： | 1000-0550(2005)01-0170-05 |
| 收稿时间： | 2004-03-10 |
| 修稿时间： | 2004年3月10日 |
Geochemical Characteristics and Source of Hydrocarbon Gases of Recent Sediment from South China Sea |
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| LIN Wei-dong,SHEN Ping,XU Yong-chang,ZHOU Yong-zhang.Geochemical Characteristics and Source of Hydrocarbon Gases of Recent Sediment from South China Sea[J].Acta Sedimentologica Sinica,2005,23(1):170-174. |
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| Authors: | LIN Wei-dong SHEN Ping XU Yong-chang ZHOU Yong-zhang |
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| Institution: | 1.Center for Earth Environment and Resources, Sun Yat-Sen University, Guangzhou 510725;2.Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000 |
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| Abstract: | 37samples of hydrocarbon gases in the recent sediment from South China Sea were analyzed for their geochemical composition and 14 samples were analyzed for isotopic composition of Methane. The relative average content of methane in the northern continental slope, southern continental slope and deep-sea plain is 95%, 91% and 94%, respectively. The content of heavy hydrocarbon gas is between 0 to 20%, average 9%. The isotopic composition of methane in continental slope area ranged form 30 to 40 and 24 to 36 in deep-sea plain area. Those data show that hydrocarbon gases in the recent sediment from continental slope area maybe come from thermal genetic gases and those from deep sea plain area may have two resources which either might be originated from biogenetic gases or from non-biogenetic gases via fault. |
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| Keywords: | South China Sea continental slope recent sediment gas geochemistry thermal genetic hydrocarbon gases |
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