Wetting properties of oil and gas reservoirs of the Tyumen formation

UDK: 552.578:53.26

DOI: 10.24887/0028-2448-2025-7-74-80

Key words: core sampling, core sample, porosity, permeability, petrophysical core studies, wettability, Western Siberia, Tyumen formation, petrophysical model, Tulbovich wettability index (M), USBM wettability index (W)

Authors: Y.I. Gilmanov (Tyumen Petroleum Research Center LLC, RF, Tyumen; Industrial University of Tyumen, RF, Tyumen); K.Y. Gilmanovа (Industrial University of Tyumen, RF, Tyumen); V.M. Yatsenko (Rosneft Oil Company, RF, Moscow)

The article considers issues related to the study of wettability of oil and gas reservoirs from various regions of Western Siberia using the example of the Tyumen formation deposits. The traditional wettability study technology is based on the OST 39-180-85 «Oil. Method for Determining the Wettability of Hydrocarbon-Containing Rocks» and reflects the quality of extraction, rather than the actual nature of wettability. The implementation of the USBM method into laboratory practice increases the information content of wettability laboratory study programs. The use of isolated core sampling technology and compliance with the requirements of the «Methodological Recommendations for the Collection and Analysis of Isolated Core» of SibBurMash Research and Development Enterprise (2022) ensures the implementation of comprehensive core study programs with increased information content. The results of special studies of the core of the Tyumen Formation reservoir rocks confirmed the presence of non-hydrophilic wettability for partial samples under study. The carbonatization of the void space, as well as the increased content of koalinite in clay cement, contribute to an increase in the hydrophobicity of reservoir rocks. The introduction of the technology of wetting restoration into the practice of laboratory work of petrophysical and filtration studies enables to obtain electrical and filtration properties of reservoir rocks that are close to the original properties of the oil and gas reservoir.

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