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Geochemistry

, Volume 3, Issue 1, pp 63–71 | Cite as

Comparison between immature and mature aromatic homologous series constituents in rock extracts from Well Han-2

  • Huang Difan 
  • Li Jinchao 
  • Cheng Zhongdi 
  • Jiang Naihuang 
Article
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Abstract

Comparison has been made of the occurrences of aromatic series in the chloroform fractions between immaturr and mature sedimentary rocks from Well Han-2 in the Qaidam Basin. According to the general formula CnH2n−p (p=6,8,10, …, 20), the molecular ion distributions of 11 series have been studies by capillary gas chromatography and GC-MS. It is found that the evolution of aromatic homologues from immature to mature obeys the thermodynamic rule and can be summarized as: (1) The alkyl side chains decrease and become shorter in the compounds of each series; (2) Alkyl and cycloalkane aromatics (1−3 rings) increase, but cycloalkane aromatics with more (4–5) rings decrease; (3) Aromatization is observed in alkyl benzene, alkyl naphthalene and alkyl phenanthrene series; and (4) The bimodal distribution of carbon number curves changes into unimodal distribution.

It seems that the variation in aromatic homologue distribution can be used as an effective indicator of maturation or as fingerprints for oil/source-rock correlation.

Keywords

Carbon Number Alkyl Benzene Qaidam Basin Cycloalkane Alkyl Side Chain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    Rüllketter, J. and Welte, D. H., Advances in Organic Geochemistry, 1979, 93–102.Google Scholar
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    Mackenzie, A. S. et al., Geochim. Cosmochim. Acta,45, 8 (1981), 1345–1356.CrossRefGoogle Scholar
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    Tissot, B. P. and Welte, D. H., Petroleum Formation and Occurrence (A new approach to oil and gas exploration), Spring Verlag Berlin Heidelberg, New York, 1978.Google Scholar
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    Huang Difan et al., Acta Petrolei Sinica (Treatise on Oil-generation in the Formations of Terrestrial Facies), An additional issue (1981), 100–112.Google Scholar

Copyright information

© Institute of Geochemistry, Chinese Academy of Sciences 1984

Authors and Affiliations

  • Huang Difan 
    • 1
  • Li Jinchao 
    • 1
  • Cheng Zhongdi 
    • 1
  • Jiang Naihuang 
    • 1
  1. 1.Institute of Petroleum Exploration and DevelopmentBeijing

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