Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (6): 836-844.doi: 10.11743/ogg20120603

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Geochemical characteristics of bitumen in the Upper Permian reef limestone in Liuqiao(Chongzuo)area,Guangxi province

Qiu Zhen1,2, Wang Qingchen2, Jia Wanglu3, Wei Hengye4, Peng Pingan3   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
    3. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China;
    4. College of Earth Science, East China Institute of Technology, Nanchang, Jiangxi 330013, China
  • Received:2011-10-25 Revised:2012-10-17 Online:2012-12-28 Published:2013-01-10

Abstract:

Bitumen are well developed in the Upper Permian reef limestone in Liuqiao area,Chongzuo,Guangxi province,and they mainly occur in the cavities and fractures of bioherms,followed by biological coelomata.The bitumen samples show a high maturity and an atomic ratio of H/C generally less than 0.1.Based on the gas chromatography-mass spectrometry analyses of saturated hydrocarbon extracted from the bitumen in the Upper Permian as well as from the silicite and and siliceous mudstones in the Dalong Formation in the Liuqiao(Chongzuo)area,we correlated their n-alkane,terpane,hopane,sterane and biomarkers.The result shows that the possibility of the bitumen being sourced from the Dalong Formation of the Upper Permian is slime.Instead,it could come from the source rocks of the Devonian in the study area.

Key words: geochemistry, bitumen, Upper Permian, reef limestone, Dalong Formation, Liuqiao, Guangxi

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