Metallogenetic Conditions of Gas Hydrate in the Northeastern Slope of the South China Sea

Abstract

Abstract:

The northeastern slope of the South China Sea has the characteristics of the passive continental margin in Cenozoic and has many oil and gas bearing basins. As a result, the geological and tectonic settings, the temperature and pressure conditions, and the methane-generating potential from the thick organic-rich sediments are all favorable for gas hydrate formation. Through the studies of structure, deposit, gas sources, gas hydrate phase equilibrium and thermodynamic conditions, this paper discussed the favorable situations for gas hydrate formation in the northeastern slope of the South China Sea. The results show that the seafloor temperature, geothermal gradient and stress conditions are favorable for gas hydrate forming; there are special tectonic settings, such as diaper, mud volcano, and slope-fault structure combination; the shallow layers have suitable lithological characteristics and high deposition rate; there are abundant biodegradation gas and thermal-genetic gas. Therefore it comes to the conclusion that the study area is a hydrate prospective area.

Key words: natural gas hydrate, hydro carbon-bearing basin, metallogenic condition, northeastern slope of the South China Sea

CLC Number:

YANG Mu-Zhuang,SHA Zhi-Bin,LIANG Jin-Qiang,WANG Hong-Bin,ZHANG Guang-Hua. Metallogenetic Conditions of Gas Hydrate in the Northeastern Slope of the South China Sea[J]. Geoscience, 2011, 25(2): 340-348.

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