| 海底沉积物中不同形式烃类气体的地球化学意义 |
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| 引用本文： | 付少英.海底沉积物中不同形式烃类气体的地球化学意义[J].地学前缘,2005,12(3):253-257. |
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| 作者姓名： | 付少英 |
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| 作者单位： | 广州海洋地质调查局,广东,广州,510760 |
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| 基金项目： | 中国地质调查局地质调查项目 |
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| 摘 要： | 顶空气法和酸解烃法将东沙群岛海域海底浅表层沉积物中不同形式的烃类气体释放出来,通过分析两类气体在沉积物中的含量及其甲烷碳同位素,发现两类气体的成因和来源不同。笔者认为,相对而言,吸附气(包裹气)反映的是一种更为早期的信息,而游离气(溶解气)则更具有“现代性”。笔者进一步认为,两类气体的不同形成过程,对于天然气水合物调查具有不同的意义,其中游离气(溶解气)具有直接的指示意义,而吸附气(包裹气)可能指示成岩时沉积物中的空间信息。
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| 关 键 词： | 顶空气 酸解烃 游离气 吸附气 热解气 微生物气 天然气水合物 |
| 文章编号： | 1005-2321（2005）03-0253-04 |
| 收稿时间： | 2005-06-10 |
| 修稿时间： | 2005-07-29 |
Characteristics of the different hydrocarbon gases in marine sediments and their geochemical significances |
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| FU Shao-ying.Characteristics of the different hydrocarbon gases in marine sediments and their geochemical significances[J].Earth Science Frontiers,2005,12(3):253-257. |
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| Authors: | FU Shao-ying |
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| Institution: | Guangzhou Marine Geological Survey. Guangzhou 510760, China |
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| Abstract: | The concentrations and their methane carbon isotopes of the two different types of hydrocarbons gases in the marine sediments, i.e., free gases or dissolved gases and adsorbed gases or captured gases, which obtained by headspace depressurizing and by acid degassing respectively, are studied in this paper. The results show that their origins and sources are different in these two types of gases, and the free gases are biogases but the adsorbed gases are thermolytical gases. In the paper it is clarified that the adsorbed gases contain earlier information and the free gases more “modern”. As to gas hydrate survey, the free gases directly indicate the occurrence of gas hydrate and the adsorbed gases imply the space significance of sediment diagenesis. |
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| Keywords: | headspace gases acid degassing gases free gases thermolytieal gases biogases gas hydrate |
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