Alginite-rich layers in the Bazhenov deposits of western Siberia

Timur Bulatov, Elena Kozlova, Evgeniya Leushina, Ivan Panchenko, Natalia Pronina, Andrey Voropaev, Nikita Morozov, Mikhail Spasennykh

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

In this study, we identified the luminescent layers containing a significant amount of al-ginite in the Upper Jurassic–Lower Cretaceous Bazhenov Formation named “the alginite-rich lay-ers”. Lithological and geochemical methods were used to determine distinctive features of these layers and to evaluate their impact on the total petroleum generation potential of the Bazhenov Formation. We have shown that the composition of the alginite-rich layers differs significantly from the organic-rich siliceous Bazhenov rocks. Rock-Eval pyrolysis, bulk kinetics of thermal decompo-sition, elemental analysis, and the composition of pyrolysis products indicate type I kerogen to be the predominant component of the organic matter (OM). Isotope composition of carbon, nitrogen, and sulfur was used to provide insights into their origin and formation pathways. The luminescent alginite-rich layers proved to be good regional stratigraphic markers of the Bazhenov Formation due to widespread distribution over the central part of Western Siberia. They can also be applied for maturity evaluation of the deposits from immature to middle of the oil window, since the lumi-nescence of the layers changes the color and intensity during maturation.

Original languageEnglish
Article number252
JournalGeosciences (Switzerland)
Volume11
Issue number6
DOIs
Publication statusPublished - Jun 2021

Keywords

  • Algal organic matter
  • Alginite-rich layers
  • Isotope composition
  • Kinetics
  • Macerals
  • Marker horizon
  • Rock-Eval pyrolysis
  • The Bazhenov formation
  • Type I kerogen

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