The Distribution Characteristics of the Thickness of Gas Hydrate Stability Zone in South China Sea

Abstract

Abstract:

Gas hydrate has important research significances in future energy, natural environment and disaster. Its formation needs sufficient gas supply, and also has close relationships with temperature and pressure. The thickness of gas hydrate stability zone (GHSZ) shows the possible range of hydrate development and distribution. The paper analyzes the thickness and distribution of GHSZ in South China Sea on the basis of the hydrate phase equilibrium formula by Dickens and QuinbyHunt in the view point of geothermic. The thickness of GHSZ changes greatly in different locations and reaches up to 1,100 meters in Luzon Trench. The thicker area distributes in the central and the eastern like a belt. All of these illuminate that South China Sea has the environment for hydrate formation. The calculated value of GHSZ is just a theoretical value, the real value in sediment and distribution characteristics of GHSZ affected by other factors, such as gas hydrate source, structure and sediment, etc. Thermal conductivity and sea floor temperature affect the thickness and distribution of GHSZ. It also has close correlation with the characteristic of heat flow and submarine topography in South China Sea.

Key words: South China Sea, gas hydrate, thickness of hydrate stability zone, heat flow

CLC Number:

TE132.2

XU Wei, QIU Nan-Sheng, SUN Chang-Yu, CHEN Guang-Jin. The Distribution Characteristics of the Thickness of Gas Hydrate Stability Zone in South China Sea[J]. Geoscience, 2010, 24(3): 467-473.

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