Isotopic composition of the aryskum depression oil (south kazakhstan)

Stanislav I. Golyshev, Nataliya L. Padalko, Rima K. Madisheva, Sultan M. Ozdoev, Vasiliy S. Portnov, Valery I. Isaev

Research output: Contribution to journalArticlepeer-review

Abstract

One of the areas discussed in modern geology is the oil and gas potential of deep horizons, including the basement of sedimentary basins. The genesis of oil deposits is the subject of heated debate. Modern geochemical methods for studying a substance, together with the instrument capabilities, which include an isotopic massspectrometer, make it possible to distinguish between oils generated by different oil source deposits. The most important indicator identifying the genesis of hydrocarbons with respect to oil and gas formation zones in a specific section is the isotopic composition of carbon. Each zone, in its turn, is characterized by individual geochemical and thermodynamic parameters, including the type and degree of conversion of dispersed organic matter, modern geothermal temperatures and paleotemperature conditions, and the phase composition of hydrocarbons. Deposits of the Aryskum depression of the South Torgai oil and gas basin (South Kazakhstan) are associated with various lithologicalstratigraphic complexes of the Jurassic-Cretaceous deposits, the Devonian-Lower Carboniferous formations of the quasi-platform complex and disintegrated basement ledges. In recent years, the prospects of the South Torgai basin have expanded and are associated with pre-Jurassic deposits. In this regard, there is the issue of the nature of hydrocarbon masses and formation of their clusters in the Mesozoic and Pre-Mesozoic formations of the Aryskum depression. The aim of the research is the comparative analysis of the carbon isotopic composition of oils from the Aryskum depression from the Mesozoic, Paleozoic sediments, as well as the ones from the zone of contact of the Paleozoic with the Mesozoic sedimentary cover to solve genetic problems and elucidate the features of the formation of oil fields in the Aryskum depression. The results made it possible to establish the regularity of the change in the 13C value depending on the age, depth, and territorial confinement of the deposits within the Aryskum depression and, based on isotopic data, make an assumption about the genesis of Mesozoic and Pre-Mesozoic oils.

Original languageEnglish
Pages (from-to)80-89
Number of pages10
JournalBulletin of the Tomsk Polytechnic University, Geo Assets Engineering
Volume331
Issue number3
DOIs
Publication statusPublished - 2020

Keywords

  • Aryskum deflection
  • Carbon isotope
  • genesis
  • isotope analysis.
  • oil

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology
  • Waste Management and Disposal
  • Economic Geology
  • Management, Monitoring, Policy and Law

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