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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2011  >  33(2): 182-187
Song Zhenxiang, Zhou Shixin, Mu Yapeng, Chen Zhao. Identification of chief hydrocarbon source rocks based on n-alkane distribution patterns in western Qaidam Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2011, 33(2): 182-187. doi: 10.11781/sysydz201102182
Citation: Song Zhenxiang, Zhou Shixin, Mu Yapeng, Chen Zhao. Identification of chief hydrocarbon source rocks based on n-alkane distribution patterns in western Qaidam Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2011, 33(2): 182-187. doi: 10.11781/sysydz201102182
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Identification of chief hydrocarbon source rocks based on n-alkane distribution patterns in western Qaidam Basin

doi: 10.11781/sysydz201102182
  • 1.

    Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China

  • 2. Key Laboratory of Gas Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China

  • 3. No. 2 Geological Party, He'nan Bureau of Geological Survey for Nonferrous Metals, Zhengzhou, He'nan 450016, China

  • Received Date: 2010-04-26
  • Rev Recd Date: 2011-02-09
  • Publish Date: 2011-04-28
    Abstract
  • The n-alkane distribution of crude oils from the western Qaidam Basin is characterized by even-to-odd (C18—C28) predominance. Source rocks from the region are mainly characterized by odd-to-even predominance. Based on n-alkane distribution pattern, combined with single molecule carbon isotope analysis, comparing crude oil with source rock, it was discussed in this paper the main source rocks in the western Qaidam Basin. The correlation of n-alkane distribution and single molecule carbon isotope analysis illustrated that the chief hydrocarbon source layer was E23 and the secondary layers were E1+2 and N31 in deep region. Meanwhile, the chief hydrocarbon source layer was N1 and the secondary layer was N2 in shallow region. Hydrocarbon potential analysis showed that those samples with even-to-odd (C18—C28) predominance possessed higher TOC, bitumen "A", total hydrocarbon content and conversion ratio, displaying huge hydrocarbon generating potential.

     

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