Steranes in neoproterozoic oils from the Nepa-Botuoba anteclise in the Siberian platform and the South Oman salt basin in the Arabian platform

V. A. Kashirtsev, A. E. Kontorovich, N. S. Kim, O. N. Chalaya, I. N. Zueva

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

A number of rare sterane hydrocarbons untypical of younger Phanerozoic petroleum systems have been found by gas chromatography-mass spectrometry in crude oils from the Nepa-Botuoba anteclise of the Siberian platform and the South Oman salt basin of the Arabian platform (Huqf family oils). Among regular steranes, a continuous series of C21 to C30 hydrocarbons including the previously unknown C23-C25 isomers have been identified. It has been noted that short-chain C21 and C22 steranes are represented by the most thermally stable pregnane species diginane and methyldiginane. Another series of steroids is represented by A-norsteranes, the structures demethylated at C10 (main fragment ion in the mass spectrum at m/z 203). Tricyclic hydrocarbons C26-C29 identified by m/z 219 have been attributed to the homologous series of 8,14-secosteranes. These chemofossils have a wide stratigraphic range of occurrence and, like modern minor secosterynes, can be associated with lipid membranes of sponge and their bacterial synbiotics.

Original languageEnglish
Pages (from-to)186-194
Number of pages9
JournalPetroleum Chemistry
Volume55
Issue number3
DOIs
Publication statusPublished - 15 May 2015
Externally publishedYes

Keywords

  • Arabian platform
  • crude oil
  • Siberian platform
  • steranes

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