Acta Chimica Sinica ›› 2010, Vol. 68 ›› Issue (18): 1881-1886. Previous Articles     Next Articles

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  1. (1国土资源部海洋油气资源与环境地质重点实验室 青岛 266071)
    (2青岛海洋地质研究所 青岛 266071)
    (3中国地质科学院矿产资源研究所 北京 100037)
    (4广州海洋地质调查局 广州 510760)
  • 投稿日期:2010-02-05 修回日期:2010-05-10 发布日期:2010-05-25
  • 通讯作者: 刘昌岭
  • 基金资助:


Raman Spectroscopic Characteristics of Natural Gas Hydrate Recovered from Shenhu Area in South China Sea and Qilian Mountain Permafrost

Liu Changling*,1,2 Ye Yuguang1,2 Meng Qingguo2 Lu Zhenquan3 Zhu Youhai3 Liu Jian4 Yang Shengxiong4   

  1. (1 Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao 266071)
    (2 Qingdao Institute of Marine Geology, Qingdao 266071)
    (3 Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037)
    (4 Guangzhou Marine Geological Survey, Guangzhou 510760)
  • Received:2010-02-05 Revised:2010-05-10 Published:2010-05-25
  • Contact: Liu changling

Natural gas hydrate samples were firstly recovered from Shenhu Area of South China Sea (SH-GH) and Qilian mountain permafrost (QLM-GH) in China. In this paper, laser micro-Raman spectroscopy was used to investigate the two kinds of samples to reveal the structural characteristics and the gas composition of these natural gas hydrates. The results show that SH-GH is typically structure I (sI) hydrate. Methane gas is a dominant component which accounts for more than 99% of all the guest gas. The cage occupancy of methane is larger than 99% for large cages while 86% for small cages, with the hydration number of approximately 5.99 by Raman method. In comparison, QLM-GH is formed by relatively complicated gas components. Except for methane (about 70%), there are also considerable amounts of ethane, propane and butane. It is presumed preliminarily that GH-QLM is structure II (sII) hydrate based on its Raman spectrum, with the cage occupancy ratio of methane for small to large cage (θS/θL) of 26.38, which is much larger than that of GH-SH (0.87). This is mainly because the lager molecules (i.e. ethane, propane and butane) in QLM-GH preferentially occupy the large cages and thus greatly diminish methane molecules in large cages.

Key words: gas hydrate, laser micro-Raman spectrometry, Shenhu Area, qilian Mountain permafrost