Journal
MARINE GEOLOGY
Volume 307, Issue -, Pages 22-27Publisher
ELSEVIER
DOI: 10.1016/j.margeo.2012.03.004
Keywords
Gas hydrates; South China Sea; Methane; Occurrence; Hydration number; Gas composition
Categories
Funding
- National Basic Research Program of China [2009CB219503]
- Chinese National Natural Science Foundation [41072037]
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For the first time gas hydrate samples were recovered in the South China Sea during a drilling campaign implemented in Shenhu area in June 2007. Laboratory based studies for the characteristics of gas hydrate were carried out on two hydrate-bearing sediment samples. Observations found that gas hydrates occurred in the pores of fine grained sediments. The hydrates were structure I based on the Raman spectroscopic results. The guest gas molecules in hydrate cages were predominantly methane (>99.3%) and trace amount of ethane (0.4%) and propane (0.04%) as determined with the method of gas chromatography. As estimated from the intensities of Raman peaks, the cage occupancy rates were more than 99% in large cage, and -86% in small cage, respectively, corresponding to a hydration number of 5.9. (C) 2012 Elsevier B.V. All rights reserved.
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