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《Geochimica》 2012-01
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Geochemistry and its genetic implications of Akesu oil seepage in the Keping uplift

WANG Qiu-ling1,JIA Wang-lu1,PENG Ping-an1,YANG Zhi-lin2 and XIAO Zhong-yao2 1.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;2.Institute of Exploration and Development Research,Tarim Oilfield Company,Korla 841000,China  
Marine source rocks have long been reported in the Keping uplift from the Tarim basin,however,there were few studies concerned about oil and gas.Geochemical characteristics and its genetic implications of an oil seepage in the Keping uplift of the Tarim basin were well investigated in this work.Akesu oil seepage had undergone severe biodegradation,hence,little genetic information could be concluded from the distribution of biomarkers in saturates.Oil asphaltenes and the absorbed/occluded hydrocarbons are hardly affected by secondary alteration,therefore,a combination of biomarkers and carbon isotopic compositions of the asphaltene pyrolysates and absorbed/occluded hydrocarbons could yield more comprehensive information on the genesis of oils.The results indicate that Akesu oil seepage was derived from different sources of absorbed/occluded hydrocarbons.The carbon isotopic signatures of the oil seepage,the asphaltenes and the pyrolysates of asphaltenes are consistent with that of most marine oils reported in the Tarim Basin,which clearly distinguish them from typical oils derived from Cambrian source rocks.However,the distributional characteristics of both biomarkers and carbon isotopes of the absorbed/occluded hydrocarbons are very similar to that of typical oils sourced from Cambrian rocks.Moreover,it might be inferred that absorbed/occluded hydrocarbons was generated at a high maturity stage from the molecular parameters.
【Fund】: 国家“十一五”油气重大专项(2008ZX05008-002);; 国家自然科学基金(41073038);; 广东省自然科学基金(9151064004000008)
【CateGory Index】: P618.13
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