末次盛冰期以来西沙海槽天然气水合物储库变化及其对环境的影响

王淑红; 颜文; 宋海斌

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WANG Shu-hong, YAN Wen, SONG Hai-bin, 2008. The Change of Gas Hydrate Reservoir and Its Effect on Environment in Xisha Trough since the Last Glacial Maximum. Earth Science, 33(1): 74-82.

Citation:

WANG Shu-hong, YAN Wen, SONG Hai-bin, 2008. The Change of Gas Hydrate Reservoir and Its Effect on Environment in Xisha Trough since the Last Glacial Maximum. Earth Science, 33(1): 74-82.

WANG Shu-hong, YAN Wen, SONG Hai-bin, 2008. The Change of Gas Hydrate Reservoir and Its Effect on Environment in Xisha Trough since the Last Glacial Maximum. Earth Science, 33(1): 74-82.

Citation:

WANG Shu-hong, YAN Wen, SONG Hai-bin, 2008. The Change of Gas Hydrate Reservoir and Its Effect on Environment in Xisha Trough since the Last Glacial Maximum. Earth Science, 33(1): 74-82.

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

WANG Shu-hong^{1, 3
,},
YAN Wen^{1, 3},
SONG Hai-bin^{2, 3}

1.
Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beij ing 100029, China
3.
Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China

Received Date: 2007-05-16
Publish Date: 2008-02-25

Abstract

Abstract

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 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 1.1×109 m³ of gas hydrate since LGM. The released methane should have greatly affected the environment.
- gas hydrate,
- last glacial maximum (LGM),
- bottom water temperature,
- sea level,
- Xisha Trough

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References(85)

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

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