Study on Genetic Types of Hydrocarbon Gases from the Gas Hydrate Drilling Area, the Northern South China Sea

Abstract

Abstract:

Gas composition and isotopes of gas hydrate, headspace gas and sediment samples from the gas hydrate drilling area, the Northern South China Sea, are analysed. Results show that gas hydrate and headspace gas are nearly composed of methane with trace ethane and propane. Their ratios of C1/（C2+C3） are higher than or close to 1,000.δ13C1 values range from -54.1‰ to -62.2‰, and δDCH4 values vary from -180‰ to -255‰. Hence they are mainly bacterial or mixed with bacterial gases, derived from CO2 reduction and produced in situ or by side migration. Results of aciddegassed gases of sediment samples also indicate that methane is mostly higher than 90%, with some ethane, propane and minor butane. The ratios of C1/（C2+C3）are lower than 50 and δ13C1 values change from -29.8‰ to -48.2‰. These features are indicative of typical thermogenic gases migrated up from the depth.

Key words: the Northern South China Sea, gas hydrate, genetictypes of gases

CLC Number:

P744.4

HUANG Xia, ZHU YOU-Hai, LEI Zhen-Quan, WANG Ping-Kang. Study on Genetic Types of Hydrocarbon Gases from the Gas Hydrate Drilling Area, the Northern South China Sea[J]. Geoscience, 2010, 24(3): 576-580.

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