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Volume 33 Issue 1
Feb 2022
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Journal of Earth Science  > 2022  >  33(1): 215-228.
Bingkun Meng, Daofu Song, Yuan Chen, Shengbao Shi, Shixin Zhou. Origin, Distribution and Geochemical Significance of Isopropyltoluene Isomers in Crude Oil. Journal of Earth Science, 2022, 33(1): 215-228. doi: 10.1007/s12583-020-1348-0
Citation: Bingkun Meng, Daofu Song, Yuan Chen, Shengbao Shi, Shixin Zhou. Origin, Distribution and Geochemical Significance of Isopropyltoluene Isomers in Crude Oil. Journal of Earth Science, 2022, 33(1): 215-228. doi: 10.1007/s12583-020-1348-0
shu

Origin, Distribution and Geochemical Significance of Isopropyltoluene Isomers in Crude Oil

doi: 10.1007/s12583-020-1348-0
  • 1.

    Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049, China

  • 3.

    State Key Laboratory of Petroleum Resources and Prospecting, College of Geosciences, China University of Petroleum, Beijing 102249, China

More Information
  • Corresponding author: Daofu Song, songdaofu2008@163.com
  • Received Date: 26 Mar 2020
  • Accepted Date: 14 May 2020
  • Publish Date: 28 Feb 2022
    Abstract
  • With comprehensive two-dimensional gas chromatography linked to time-of-flight mass spectrometry (GC×GC-TOFMS), ten light hydrocarbon (LH) compounds were qualitatively and quantitatively studied in light hydrocarbons (LHs) components of crude oils. For significant differences in the concentrations of 3-isoproyltoluene (3-iPT), 4-isoproyltoluene (4-iPT) and 2-isoproyltoluene (2-iPT) in crude oils, and the 2-iPT probably derived mainly from similar skeleton monocyclic terpenoids via dehydrogenation and aromatization, the ratios of (3+4)-/2-iPT (iPTr), 3-/2-iPT (iPTr1) and 4-/2-iPT (iPTr2) are proposed to distinguish the organic matter origin of crude oils. Relatively higher iPTr (> 8.0), iPTr1 (> 7.0) and iPTr2 (> 4.0) values indicate that crude oils are sourced from the co-contribution of lower aquatic organisms, bacteria, algae, and terrestrial higher plants, whereas lower iPTr (< 5.0), iPTr1 (< 3.0), iPTr2 (< 2.0) values suggest that crude oils originated from terrestrial higher plants. The iPTr, iPTr1, and iPTr2 values show notable distinction which is mainly controlled by 2-iPT concentrations, while the concentrations of 3-iPT and 4-iPT have similar distribution range in all studied oils. The 2-iPT depleted in marine oils from the Tarim Basin and lacustrine oils from the Beibuwan Basin is less than 0.30 mg/g LHs, whereas 2-iPT enriched in swamp oils from the Tarim Basin is greater than 0.50 mg/g LHs. The iPTr, iPTr1, and iPTr2 ratios and 2-iPT concentrations can be used to distinguish the organic matter origin of crude oils, especially for light oils and condensates with low concentrations of biomarkers.

     

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