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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2016  >  38(5): 692-697
Zhang Baoshou, Li Meijun, Zhao Qing, Wang Tieguan, Zhang Ke, Xiao Zhongyao, Huang Shaoying. Determining the relative abundance of C26-C28 triaromatic steroids in crude oils and its application in petroleum geochemistry[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(5): 692-697. doi: 10.11781/sysydz201605692
Citation: Zhang Baoshou, Li Meijun, Zhao Qing, Wang Tieguan, Zhang Ke, Xiao Zhongyao, Huang Shaoying. Determining the relative abundance of C26-C28 triaromatic steroids in crude oils and its application in petroleum geochemistry[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2016, 38(5): 692-697. doi: 10.11781/sysydz201605692
shu

Determining the relative abundance of C26-C28 triaromatic steroids in crude oils and its application in petroleum geochemistry

doi: 10.11781/sysydz201605692
  • 1.

    Petroleum Exploration & Production Research Institute, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China

  • 2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China

  • Received Date: 2015-08-03
  • Rev Recd Date: 2016-08-02
  • Publish Date: 2016-09-28
    Abstract
  • Triaromatic steroids (TAS) may be formed by the aromatization of regular steranes. C26-C28 TAS widely occur in crude oils and source rocks. The C2620R and C2720S TAS typically co-elute with each other in m/z 231 mass chromatograms of aromatic fractions. Therefore, the relative abundance of C26, C27 and C28 TAS cannot be determined by routine GC-MS analysis. A ternary diagram similar to that of C27-C28-C29 regular steranes cannot be established to classify oil families, which leads to the limited use of TAS in petroleum geochemistry. This paper proposed a simple method to estimate the relative abundance of homologues and isomers of TAS on the basis of the distribution patterns, origin and thermal evolution of TAS isomers. Taking representative Paleozoic oil samples from the tectonic region of the Tarim Basin as an example, this paper distinguished two petroleum populations on the ternary diagram of C26-C27-C28 triaromatic steroids determined by routine GC-MS analysis. The oils from the Fushan Sag in the Beibuwan Basin (South China Sea) have different distribution patterns of TAS. The oil family classification is also consistent with that by other molecular markers. For their relatively higher thermal stabilities, triaromatic steroids are generally present in significant abundance in oils and condensates with high maturity. Therefore, this ternary diagram of aromatic steroids is a potential geochemical indicator for oil-to-oil correlation and oil family classification as a substitute for that of regular steranes.

     

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