Centers of generation of Bazhenov- and Togur-type oils in the Southern Nyurol'ka megadepression

V. I. Isaev, A. N. Fomin

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The dispersed organic matter of the Bazhenov Formation and Togur Member was correlated with the Bazhenov- and Togur-type oils in the southern Nyurol'ka megadepression, Tomsk Region. On the basis of lithostratigraphic columns, data of testing and sampling of nineteen prospecting-exploratory wells, and vitrinite reflectance, the Meso-Cenozoic sedimentary section was mathematically simulated in the form of a 3D-2D thermal model. According to the temperature zoning of oil and gas formation in the Bazhenov and Tyumen' Formations, centers of oil generation were established and the time of their joining to the major zone of oil formation was determined. The center of generation of the Bazhenov-type oils appeared at 32-24 Ma. In plan, it coincides with local folds in the Upper Jurassic sediments of the Igol'-Talovy uplift, Karai-Aisaz trough, and northwestern Aisaz rampart. The center of generation of the Togur-type oils originated at 24 Ma and is associated with the Karai fold and local uplifts of the Karai-Aisaz trough. The possible effect of nonstationary deep heat flow, Pleistocene-Holocene cryogenic processes, and Miocene erosion on the predictive model for oil generation centers has been quantitatively estimated.

Original languageEnglish
Pages (from-to)734-745
Number of pages12
JournalGeologiya i Geofizika
Volume47
Issue number6
Publication statusPublished - 2006

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oil
trough
uplift
fold
vitrinite reflectance
heat flow
zoning
Jurassic
Miocene
Holocene
Pleistocene
erosion
well
organic matter
sampling
gas
sediment
temperature

Keywords

  • Bazhenov-type oil
  • Center and time of oil generation
  • Deep-seated heat flow
  • Dispersed organic matter
  • Nyurol'ka depression
  • Paleocryolithozone
  • Thermodynamic model for sedimentary section
  • Togur-type oil
  • Tomsk Region

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Centers of generation of Bazhenov- and Togur-type oils in the Southern Nyurol'ka megadepression. / Isaev, V. I.; Fomin, A. N.

In: Geologiya i Geofizika, Vol. 47, No. 6, 2006, p. 734-745.

Research output: Contribution to journalArticle

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