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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2016  >  38(5): 647-651
Jin Xiaohui, Sun Runxuan, Chen Xia, Sun Yipu, Zhang Juntao, Li Shujun. Geochemical characteristics and significance of bitumen of Ordovician outcrops at the southern margin of Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(5): 647-651. doi: 10.11781/sysydz201605647
Citation: Jin Xiaohui, Sun Runxuan, Chen Xia, Sun Yipu, Zhang Juntao, Li Shujun. Geochemical characteristics and significance of bitumen of Ordovician outcrops at the southern margin of Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(5): 647-651. doi: 10.11781/sysydz201605647
shu

Geochemical characteristics and significance of bitumen of Ordovician outcrops at the southern margin of Ordos Basin

doi: 10.11781/sysydz201605647
  • 1.

    SINOPEC Petroleum Exploration & Production Research Institute, Beijing 100083, China

  • 2. School of Geosciences, China University of Petroleum, Beijing 102249, China

  • Received Date: 2016-05-08
  • Rev Recd Date: 2016-08-03
  • Publish Date: 2016-09-28
    Abstract
  • Outcrop bitumen occurs in the limestone cracks in the Lower Ordovician Liangjiashan Formation at the southern margin of Ordos Basin. The cracks are nearly vertical. The bitumen zone is about 75 m high and 1-44 cm wide, and is wide at the bottom and narrow on the top. The carbon isotope value of the bitumen is -28‰. Equivalent bitumen vitrinite reflectance ranges from 1.829%-1.965%. The bitumen and the source rocks in the Upper Ordovician Beiguoshan Formation have low Pr/Ph values and high C24 tetracyclic terpane biomarker concentrations. Bitumen samples with C29 sterane predominance and low gammacerane index reveal that hydrocarbon parent materials were formed in a low-brackish water environment from marine plankton. The composition of steroids is "V" type, and the biomar-kers such as C24 tetracyclic terpanes/C26 tricyclic terpanes and Tm/Ts are similar, indicating a genetic relationship. The geochemical characteristics and significance of bitumen of the Ordovician outcrops at the southern margin of Ordos Basin have helpful for the evaluation of the Lower Paleozoic carbonate source rocks.

     

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