Chinese Science Bulletin

, Volume 51, Issue 13, pp 1628–1632 | Cite as

Identification and significance of 3β-alkyl steranes in the Eogene lacustrine sediments and petroleum of China

  • Wang Guangli Email author
  • Zhang Linye 
  • Wang Tieguan 


Several homologous series of steranes with alkyl side chains (C1 to C4) at the 3β position have been identified in the Jiyang Eogene lacustrine deposition. It is postulated that its precursors represent a new class of steroids, alkylated at the C-3 position with a polyhydroxy n-alkane. These precursors may have been formed by the bacterial addition of a ribose sugar to Δ2-sterenes, diagenetic alteration products of steroids synthesized by eukaryotes. 3-alkyl steroids might substitute for hopanols in bacterial membranes. When they are present in a sample, the patterns of the isomer distributions of 3-alkyl steranes are similar to desmethyl steranes except for lower rearranged ones. It is shown that the configurational isomerization of 3-alkyl steranes is trending in line with that of desmethyl steranes with increasing of maturity. The abundance of 3-alkyl steranes may be controlled by the depositional environments; they are primary in saline or near shore lacustrine, moderate in shallow lacustrine, poor in sub-deep to deep lacustrine relative to the 4-methyl steranes.


3-alkyl steranes lacustrine deposition GC-MS-MS Eogene Jiyang super-depression 


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Copyright information

© Science in China Press 2006

Authors and Affiliations

  • Wang Guangli 
    • 1
    • 2
    Email author
  • Zhang Linye 
    • 2
  • Wang Tieguan 
    • 1
  1. 1.Key Laboratory for Petroleum Formation MechanismsPetroleum University of ChinaBeijingChina
  2. 2.Institute of Geological SciencesShengli Oilfield Co. LtdDongyingChina

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