| 青海聚乎更钻探区含水合物岩心气体组成及其指示意义 |
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| 引用本文： | 贺行良,刘昌岭,孟庆国,卢振权,文怀军,李永红,张少林,王江涛. 青海聚乎更钻探区含水合物岩心气体组成及其指示意义[J]. 现代地质, 2015, 29(5): 1194-1200 |
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| 作者姓名： | 贺行良 刘昌岭 孟庆国 卢振权 文怀军 李永红 张少林 王江涛 |
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| 作者单位： | (1.中国海洋大学海洋化学理论与工程技术教育部重点实验室，山东 青岛266100；2.国土资源部天然气水合物重点实验室 青岛海洋地质研究所，山东 青岛266071； 3.中国地质调查局油气资源调查中心，北京100029；4.青海煤炭地质一0五勘探队，青海 西宁810007) |
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| 基金项目： | 国家自然科学基金项目(41406076, 41302034)。 |
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| 摘 要： | 对青海聚乎更钻探区含天然 气水合物岩心气体组成特征进行研究，有助于弄清钻探区天然气水合物的气体成因及来源，对于区内天然气水合物的勘探开发具有重要的指导意义。对DK8-19、DK10-17、DK11-14、DK12- 13和DK13-11等5个钻孔获得的18个含水合物岩心样品，开展了气体组成和同位素特征及Cl/(C2+C3)-δ13CC1、δDC1-δ13CC1和δ13CC2-δ13CC1等关系图解的综合研究。结果显示：青海聚乎 更钻探区含水合物岩心气体以轻烃为主，具湿气特征，其同位素表现为正碳同位素系列特征。除DK8-19孔浅层岩心烃类气体可能含有少量生物成因气外，钻探区其余各孔所有样品的气源组成均以热解成因气为主，为典型的有机成因烃类气体，且来源于淡水环境下形成的天然气。
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| 关 键 词： | 天然气水合物 聚乎更钻探区 气体组成 同位素 气源成因 |
Gas Composition of Hydrate-bearing Cores in Juhugeng Drilling Area in Qinghai and Its Indicative Significance |
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| Affiliation: | (1.Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, Ocean University of China, Qingdao, Shandong266100, China；2.Key Laboratory of Gas Hydrate of Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao, Shandong266071, China; 3.Oil & Gas Survey, China Geological Survey, Beijing100029, China; 4.Qinghai No.105 Coal Geological Exploration Team, Xining, Qinghai810007, China) |
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| Abstract: | Studying the composition characteristics of gases dissociated from hydrate-bearing cores in Juhugeng drilling area in Qinghai can be helpful for finding out the gases genesis and origin of natural gas hydrates, and can provide scientific guidance for gas hydrates exploration and exploitation. The gas molecular and stable isotopic compositions are analyzed for the totally 18 hydrate-bearing cores from 5 drilling holes (DK8-19, DK10-17, DK11-14, DK12-13 and DK13-11). The relevant diagrams of Cl/ (C2+C3)-δ13CC1, δDC1-δ13CC1 and δ13CC2-δ13CC1 are investigated in this paper. The results show that gases dissociated from hydrate-bearing cores mainly composed of light hydrocarbons with features of wet gas in Juhugeng drilling area in Qinghai and the isotopes are characterized as normal carbon isotopic series. In the drilling area, gases from most hydrate-bearing cores are mainly thermogenetic gas origin, and typical organic genetic gases formed in freshwater environment. However, it contains probably a small amount of biogenic gases in the shallow cores of DK8-19 hole. |
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| Keywords: | gas hydrate Juhugeng drilling area gas composition isotope gas origin |
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