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《Marine Geology Frontiers》 2011-06
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GEOCHEMICAL CHARACTERISTICS OF HYDROCARBON GASES IN SEDIMENTS IN SHENHU AREA,THE NORTHERN SOUTH CHINA SEA

WU Lushan1,2,YANG Shengxiong2,LIANG Jinqiang2,SU Xin1,CHENG Sihai2,FU Shaoying2,GONG Yuehua2,ZHU Youhai3(1 School of Ocean Sciences,China University of Geosciences,Beijing 100083,China;2 Guangzhou Marine Geological Survey,Guangzhou 510760,China;3 Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China)  
The anomalous distribution of the gases in headspace of shallow sediments could be applied as an indicator to explore whether there are gas hydrate accumulations underneath.Comprehensive analyses of hydrocarbon gas composition and isotopic composition of methane in headspace gas in shallow sediments and related drilling cores in the Shenhu area are studied in this paper.Results show that CH4 is the major component of gases from the total 291 samples 1 mbsf(bsf,below sea floor) with trace C2H6 and C3H8,and the normalized concentrations of CH4 range from 2.49 to 77.23 μL/kg with an average value of 15.22 μL/kg.CH4 concentration from 12 anomalies were determined using tendency analysis method,and they extend in a NE direction as a whole,that is obviously controlled by NE trend fractures.The δ13C values of CH4 from 14 headspace gas samples from Sites 4PC and 23PC range from-74.3‰ to-46.2‰ with an average value of-60.9‰(PDB),and the ratios of C1/(C2+C3) range from 5.78 to 49.45 with an average of 16.23.This indicates that hydrocarbon gases of those samples are mainly microbial gas with small fraction of thermogenic gas.Isotopic anaylses were applied to 4 headspace gas samples collected from the drilling cores.It is found that δ13C and δD values of CH4 are-62.2‰ to-54.1‰(PDB) and-225‰ to-180‰(SMOW),respectively,and the ratios of C1/(C2+C3) was ranging from 575 to 1 668,suggesting that CH4 seems to be microbial gas or mixed gases with microbial gas dominating,and CH4 was mainly generated from microbial CO2 reduction and there is a little contribution from thermogenic gas.Our study indicates that the headspace hydrocarbon gases in shallow sediments were from gas hydrates,hydrocarbon source rocks or gas accumulations underneath.The hydrocarbon gases migrated upward along faults and diapir structures.Hydrocarbon gases originated from the dissociation of gas hydrates are mainly microbial gas,and those from hydrocarbon source rocks or gas accumulations are thermogenic gases in origin.
【Fund】: 国家重点基础研究发展计划项目(2009CB219508和2009CB219502);; 国土资源部公益性行业科研专项(200811014)
【CateGory Index】: P736.4
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