Известия Томского политехнического университета: Инжиниринг георесурсов (Feb 2022)

PALEOGEOGRAPHY OF THE TYUMEN FORMATION WITHIN THE UST-BALYK-MAMONTOV SHAFT

  • Dmitry A. Staroselets,
  • Pavel V. Smirnov

DOI
https://doi.org/10.18799/24131830/2022/2/2926
Journal volume & issue
Vol. 333, no. 2
pp. 98 – 110

Abstract

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The relevance of studying the Tyumen formation is justified by the fact that at present there is a decline in oil production from the Lower Cretaceous and Upper Jurassic intervals. As a result, there is a need to replenish the production fund. The greatest prospects for further production are associated with Middle Jurassic deposits, which represent a long-term prospect for hydrocarbon prospecting, exploration and production in Western Siberia. In addition, an important factor is the spread of productive deposits of the Tyumen formation within the territories with developed infrastructure. The main aim: to restore the conditions of sediment accumulation of US2 and US3 oil-bearing beds within the limits of Ust-Balik-Mamontov shaft. Objects: oil-bearing beds of the US2 and US3 of the Tyumen formation in the northwestern part of the Ust-Balik-Mamantov shaft. Methods: lithologic-facial analysis of core material, including detailed description of the core, identification of lithogenetic types of rocks, facies and macrofacies, particle size analysis, study of petrographic features of rocks; analysis of geophysical data, including well logging and seismic studies. Results. The facial conditions of formation US2 and US3 oil-bearing beds of the Tyumen formation were determined. Their lateral and vertical distribution in the investigated area was revealed. Separation of layers of US2 into three packs was proposed. Four paleo-geographical diagrams US2 and US3 oil-bearing beds were created, three of them belong to US2 oil-bearing bed and show the paleo-geographical arrangement for the time of formation of each of the packs. The zones of distribution of reservoir rocks with the best reservoir properties are predicted and the most promising zones for drilling are identified. The conclusions about validity of the revealed regularities for the Tyumen formation within the neighboring territories were made.

Keywords