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现代地质 ›› 2010, Vol. 24 ›› Issue (2): 329-336.

• 能源地质 • 上一篇    下一篇

青海省祁连山冻土区天然气水合物存在的主要证据

卢振权1,祝有海1,张永勤2,文怀军3,贾志耀3,李永红3,刘昌岭4,王平康1,李清海3,郭星旺1   

  1. 1.中国地质科学院 矿产资源研究所, 北京100037;   2.中国地质科学院 勘探技术研究所, 河北 廊坊065000;
    3. 青海省煤炭地质局105勘探队,青海 西宁810007;
  • 出版日期:2010-04-20 发布日期:2010-05-10
  • 作者简介:卢振权,男,研究员,1972年出生,海洋地质与地球化学专业,主要从事天然气水合物与油气的地质地球化学勘查研究。Email: luzhq@vip.sina.com
  • 基金资助:

    中国地质调查局地质大调查项目;国家重点基础研究发展计划项目(2009CB219501);中央公益性科研院所基本科研业务费专项基金项目。

Major Evidence for Gas Hydrate Existence in the Qilian Permafrost, Qinghai

 LU Zhen-Quan1,ZHU  You-Hai1,ZHANG  Yong-Qin2, WEN  Huai-Jun3, Jia Zhi-Yao3   

  1. 1. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing100037, China;
    2. Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang, Hebei065000, China;
    3.Qinghai No-105 Coal Geological Exploration Team, Xining, Qinghai810007, China
  • Online:2010-04-20 Published:2010-05-10

摘要:

2008年冬季和2009年夏天首次在我国陆域祁连山冻土区钻获到天然气水合物实物样品。野外直接观察到白色冰状天然气水合物与点火燃烧现象及其他明显的异常现象,如含天然气水合物岩心表面强烈地冒气泡、渗出水珠、没入水中冒出长串气泡、井中释放异常压力气体、密闭条件下解析出异常含量气体、岩心晾干后留下重烃斑迹、残余细蜂窝状构造、伴生晶型完好的菱形自生方解石矿物、热红外低温异常等现象;室内激光拉曼光谱检测到天然气水合物笼状体峰及其包含的烃类气体峰,宏观地球物理测井曲线上显示含天然气水合物岩心段存在明显偏高的电阻率和声波速度异常。祁连山冻土区天然气水合物及其异常现象主要产出在冻土层下130~400 m之间的细砂岩孔隙与裂隙中及泥岩、油页岩、粉砂岩等裂隙中。

关键词: 天然气水合物, 主要证据, 冻土, 祁连山, 青海

Abstract:

Gas hydrate was discovered for the first time on the continent of China, namely in the Qilian Mountain permafrost of Qinghai Province in the winter of 2008 and the summer of 2009. In the field, white icelike gas hydrate and the burning phenomenon were directly observed. Its obvious relevant anomalies were also recorded. These anomalies include phenomena of strongly bubbling and water seeping on the fresh surface of gas hydrate bearing cores, a chain of bubbles coming from under water when gas hydrate bearing cores are submerged, extraordinary gases coming from the well when gas hydrate bearing layers are drilled through, a large amount of gases when gas hydrate bearing cores are extracted under airtight conditions, heavy hydrocarbon traces and residual cellular textures over the surface of gas hydrate bearing cores, concomitant rhombic autogenetic calcite crystals, relatively low temperature signals indicated by infrared camera, etc. Indoor Raman spectrometry excellently detected normal peaks of hydrate water and its caged hydrocarbons. Macroscopically gas hydrate bearing layers corresponded to high electrical resistivity and sonic velocity in the log profile. Generally gas hydrate and its related anomalies occurred either in the pore and fissure of fine sandstone or in the fissure of mudstone, oily shale, siltstone at the 130-400 m interval of the Qilian Mountain permafrost.

Key words: gas hydrate, major evidence, permafrost, Qilian Mountain, Qinghai

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