| 青藏高原乌丽冻土区二氧化碳成因探讨 |
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| 引用本文： | 杨德寿,龚建明,贺行良,王慧东,陈俊文,杨志承,蒋玉波.青藏高原乌丽冻土区二氧化碳成因探讨[J].现代地质,2013,27(6):1392. |
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| 作者姓名： | 杨德寿 龚建明 贺行良 王慧东 陈俊文 杨志承 蒋玉波 |
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| 作者单位： | 青海煤炭地质勘查院，青海 西宁810001 |
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| 基金项目： | 国家自然科学基金项目(41273066)；青海省治多县乌丽地区天然气水合物调查项目。 |
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| 摘 要： | 为了查明青藏高原乌丽冻土区天然气的组分与成因，对采集自乌丽水合物试验孔ZK1井及其周边钻孔的岩心顶空气、岩心解析气以及湖水气进行了组分和碳同位素测试分析，同时对ZK1井及其周边钻孔岩心中的碳酸盐岩碳同位素进行了测试分析。测试结果显示:该区天然气主要成分为二氧化碳，其含量在98%以上，烃类气体(主要为甲烷)含量很少；二氧化碳碳同位素主频在-4‰～-6‰(VPDB)之间，少量富烃样品的甲烷碳同位素主频介于-3238‰～-2782‰（VPDB）之间，碳酸盐岩的碳同位素平均值为-387‰（VPDB）。综合分析认为，研究区二氧化碳主要为幔源成因，可能与该区强烈的构造运动和岩浆活动有关。
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| 关 键 词： | /> 成因 二氧化碳 乌丽冻土区 青藏高原 |
Discussion about the CO2 Origins of Wuli Permafrost Zone in Qinghai Tibetan Plateau |
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| YANG De shou,GONG Jian ming,HE Xing liang,WANG Hui dong.Discussion about the CO2 Origins of Wuli Permafrost Zone in Qinghai Tibetan Plateau[J].Geoscience——Journal of Graduate School,China University of Geosciences,2013,27(6):1392. |
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| Authors: | YANG De shou GONG Jian ming HE Xing liang WANG Hui dong |
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| Institution: | Qinghai Coal Geological Exploration Institute, Xining，Qinghai810001, China |
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| Abstract: | In order to understand the component and origin of gases from gas hydrate drillhole (ZK1) in Wuli permafrost zone, Qinghai Tibetan Plateau, the gas components and the carbon isotopes of headspace gas samples and resolving gas samples from hole ZK1 and its adjacent drillholes and gas samples from lake water are analyzed. At the same time, the carbon isotopes of carbonate rocks from cores are also analyzed. The results show that more than 98% natural gas is composed of carbon dioxide with a little hydrocarbon gas(mainly methane),the main maximum values of δ13CCO2 are between-4‰ and-6‰(VPDB), the main maximum values of δ13CCH4 from a few rich methane samples are between -3238‰ and -2782‰(VPDB), while the mean value of δ13CCaCO3 is -387‰(VPDB).Integrated with regional geology, it could be drawn a conclusion that the CO2 of Wuli permafrost zone is mainly of volcanic mantle type, which is related with strong tectonic movement and magma activities. |
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| Keywords: | carbon dioxide Wuli permafrost zone Qinghai Tibetan Plateau |
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