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Volume 18 Issue 1
Feb 2007
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Shuhong WANG, Wen YAN, Haibin SONG. Change of Gas Hydrate Reservoir and Its Effect on the Environment in Xisha Trough since the Last Glacial Maximum. Journal of Earth Science, 2007, 18(1): 39-48.
Citation: Shuhong WANG, Wen YAN, Haibin SONG. Change of Gas Hydrate Reservoir and Its Effect on the Environment in Xisha Trough since the Last Glacial Maximum. Journal of Earth Science, 2007, 18(1): 39-48.

Change of Gas Hydrate Reservoir and Its Effect on the Environment in Xisha Trough since the Last Glacial Maximum

Funds:

the Innovation Program of the Chinese Academy of Sciences KZCX2-YW-211

the National Natural Science Foundation of China 40676043

the Foundation of Key Laboratory of Marginal Sea Geology, the South China Sea Institute of Oceanology, Chinese Academy of Sciences MSGL0509

the Start-up Foundation for Doctor Scientific Research of South China Sea Institute of Oceanology, Chinese Academy of Sciences 

More Information
  • Corresponding author: Yan Wen, wyan@scsio.ac.cn
  • Received Date: 26 Sep 2006
  • Accepted Date: 20 Dec 2006
  • In this article, Milkov and Sassen's model is selected to calculate the thickness of the gas hydrate stable zone (GHSZ) and the amount of gas hydrate in the Xisha (西沙) Trough at present and at the last glacial maximum (LGM), respectively, and the effects of the changes in the bottom water temperature and the sea level on these were also discussed. The average thickness of the GHSZ in Xisha Trough is estimated to be 287 m and 299 m based on the relationship between the GHSZ thickness and the water depth established in this study at present and at LGM, respectively. Then, by assuming that the distributed area of gas hydrates is 8 000 km2 and that the gas hydrate saturation is 1.2% of the sediment volume, the amounts of gas hydrate are estimated to be -2.76×1010 m3 and -2.87×1010 m3, and the volumes of hydrate-bound gases are -4.52×1012 m3 and -4.71×1012 m3 at present and at LGM, respectively. The above results show that the thickness of GHSZ decreases with the bottom water temperature increase and increases with the sea level increase, wherein the effect of the former is larger than that of the latter, that the average thickness of GHSZ in Xisha Trough had been reduced by -12 m, and that 1.9×1011 m3 of methane is released from approximately 1.1×109m3 of gas hydrate since LGM. The released methane should have greatly affected the environment.

     

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