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《Geochimica》 2012-02
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Geochemical constraints on the multiple origins of shallow-buried natural gases in the Junggar Basin

SUN Ping-an1,WANG Xu-long2,TANG Yong2,WAN Min2 and CAO Jian11.School of Earth Sciences and Engineering,Nanjing University,Nanjing 210093,China;2.PetroChina Xinjiang Oilfield Company,Karamay 834000,China  
The shallow-buried natural gas is a hot topic in the exploration and basic study of natural gas,and has become a new important petroleum-exploration field in the Junggar Basin.It,however,has not been well studied.Based on a case study of the central Junggar Basin,multiple origins of the gas are revealed in this study by relatively comprehensive geochemical analyses including gas components,carbon isotope and light hydrocarbon,as well as biomarker analyses of associated condensates and reservoir bitumens.This provides more information for understanding gas accumulation and exploration of the area,and may also have wide implications for analogue elsewhere.The shallow-buried natural gases in the central Junggar Basin are mainly found in the Luliang,Dixi,Dibei and Baijiahai areas.Gases in the Luliang area are attributed to the origin of oil biodegradation.Their representative features include extremely high dryness(consisting almost entirely of methane) and light δ13C1 values(ranging from –55‰ to –45‰).Gases in the Dixi area are mainly the coal-type gas sourced from the Carboniferous,and partly coal-type and oil-type gases sourced from the Permian.The gases have a relatively large variation in δ13C2 values,ranging from –30.67‰ to –22.20‰.Gases in the Dibei area are the coal-type gas generated from the Carboniferous,with heavy δ13C2 values varying from –24.54‰ to –23.72‰.Gases in the Baijiahai area are highly mature coal-type gases sourced from the Permian.The gases are characterized by high dryness up to 0.97 and heavy δ13C2 values ranging from –30.15‰ to –29.45‰.Therefore,the shallow-buried gases in the study area have multiple origins,mainly including oil degradation gas,oil-type gas and coal-type gas with different sources.This indicates that gas accumulation of the area is complex,which should be laid enough emphasis in the future petroleum exploration.
【Fund】: 国家自然科学基金(41072090 40872086)
【CateGory Index】: P618.13
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