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陆域冻土区天然气水合物地球化学勘查中顶空气轻烃应用模式试验
投稿时间:2019-04-22  修订日期:2019-12-09  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020092
摘要点击次数: 17
全文下载次数: 26
作者单位E-mail
周亚龙 中国地质科学院 地球物理地球化学勘查研究所 zhouyalong@igge.cn 
杨志斌 中国地质科学院 地球物理地球化学勘查研究所  
张舜尧 中国地质科学院 地球物理地球化学勘查研究所  
中文摘要:内容摘要:为探索顶空气轻烃技术在陆域冻土区天然气水合物地球化学勘查中的应用,选择祁连山木里已知天然气水合物矿区和哈拉湖未知区作为方法技术的试验区。试验指标包括土壤顶空气、土壤酸解烃、岩屑顶空气轻烃测井、甲烷碳同位素。研究表明:祁连山木里已知天然气水合物矿藏上方,土壤顶空气轻烃组分以甲烷为主的特征,甲烷所占比例非常高,90.6%的样品C1含量都在78%以上,甲烷含量显著高于常规油气盆地;未发现天然气水合物的哈拉湖试验区,无明显的土壤顶空气轻烃异常现象。顶空气轻烃异常模式为:平面上,矿藏上方近地表土壤中存在明显的顶空气甲烷强异常;剖面上,在天然气水合物稳定带上方呈现“前缘晕”异常特征;其空间分布与祁连山水合物矿藏展布空间具有套合关系。甲烷碳同位素和烃类组成判断地表油气化探异常为热解成因,与祁连山冻土区天然气水合物的气体为同一成因来源。陆域冻土区天然气水合物顶空气轻烃地球化学勘查技术试验结果表明:该地球化学方法既可以判断水合物成因类型,也可以圈出水合物矿藏范围。
中文关键词:顶空气轻烃  天然气水合物  地表化探  多年冻土区  祁连山
 
Study on Application Mode of Top Air Light Hydrocarbon in Geochemistry Exploration of Natural Gas Hydrate in Permafrost Regions
Author NameAffiliationE-mail
zhouyalong Institute of Geophysical and Geochemical Exploration, CAGS zhouyalong@igge.cn 
YANG Zhibin Institute of Geophysical and Geochemical Exploration, CAGS  
ZHANG Shunyao Institute of Geophysical and Geochemical Exploration, CAGS  
Abstract:Abstract: In order to explore the application of the top air hydrocarbon technology in gas hydrates geochemical exploration in land permafrost region, the known natural gas hydrate mining area of Qilian Muli and the unknown Hala lake is chosen as the test area. The test indexes include soil top air、soil acid solution hydrocarbon、debris roof air logging and methane carbon isotope. The research shows that the methane as the main component of the top air hydrocarbon above the the known natural gas hydrate mining area of Qilian Muli is of high percentage, significantly higher than these conventional oil basins ,and 90.6 percent of C1 content is above 78%. In the plane, there is an obvious anomaly of soil top air methane above the mine, and on the section, there is “frontal halo”anomalous characteristics above the stable zone of the hydrate,the spatial distribution of which has close relation with Qilian mountain hydrate mineral spread distribution. The surface oil-gas geochemical anomaly is pyrolysis origin based on the judgment of methane carbon isotopes and hydrocarbons, the same origin as the gas hydrate of Qilian mountain permafrost region. There is no obvious characteristics of top air hydrocarbon anomaly in the Hala lake test area where natural gas hydrate is not discovered. The test result of geochemical exploration techniques of natural gas hydrates in the land area of permafrost region indicates that the technology can be used to determine the genetic type of hydrate, as well as can circle the range of hydrate deposits.
keywords:Hydrocarbon of Top Air  Natural Gas Hydrate  Surface Geochemical Exploration  Permafrost Regions for Many Years  Qilian Mountain
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