Possible sources of Jurassic and Cretaceous deposits saturation on the southeastern side of the Frolov megadepression

UDK: 550.8

DOI: 10.24887/0028-2448-2026-5-15-22

Key words: basin modeling, hydrocarbon system functioning, organic matter transformation, kinetics, Frolov megadepression

Authors: M.L. Makhnutina (Lomonosov Moscow State University, RF, Moscow ); M.T. Delengov (Gubkin University, RF, Moscow); O.N. Vidishcheva (Lomonosov Moscow State University, RF, Moscow ); A.G. Kalmykov (Lomonosov Moscow State University, RF, Moscow ); O.A. Emelianenko (Gubkin University, RF, Moscow); K.I. Dantsova (Gubkin University, RF, Moscow); S.F. Khafizov (Gubkin University, RF, Moscow); G.A. Kalmykov (Lomonosov Moscow State University, RF, Moscow )

Basin modeling is currently a key tool for studying the geological evolution and assessing the functioning of hydrocarbon systems in various territories. During the preliminary assessment of a territory's oil and gas potential, it increases the likelihood of successfully drilling new wells, and during the development phase, it can play a significant role, especially when working with a complex obkect, such as the example discussed in this paper. The article presents the results of basin modeling of various scenarios for the oil deposits formation in Late Jurassic and Early Cretaceous strata on the southeastern side of the Frolov megadepression. To improve the accuracy of modeling, an approach for the initial kinetic spectra reconstruction based on the kerogen conversion laboratory modeling results and 1D basin modeling was proposed. The obtained results showed that in the case of high kerogen reactivity productive deposits are saturated with fluids from the Lower and Middle Jurassic source rocks, which do not correspond to the results of comparing the molecular composition of the oils and extracts from the source rocks. It is possible to achieve a significant contribution of hydrocarbons generated by the Bazhenov formation in the case of hydrothermal fluid impact during the Late Cretaceous or Paleogene time, or in the case of lateral migration from neighboring areas with more transformed Bazhenov deposits.

References

1. Allen P.A., Allen J.R., Basin analysis: Principles and application to petroleum play assessment, John Wiley & Sons, 2013, 640 p.

2. Galushkin Yu.I., Modelirovanie osadochnykh basseynov i otsenka ikh neftegazonosnosti (Simulation of sedimentary basins and assessment of their oil and gas potential), Moscow: Nauchnyy mir Publ., 2007, 456 p.

3. Reshenie VI Mezhvedomstvennogo stratigraficheskogo soveshchaniya po rassmotreniyu i prinyatiyu utochnennykh stratigraficheskikh skhem mezozoyskikh otlozheniy Zapadnoy Sibiri (Decision VI of the interdepartmental stratigraphic meeting on the review and adoption of refined stratigraphic schemes of the Mesozoic deposits of Western Siberia), Novosibirsk: Publ. of SNIIGGiMS, 2004, 114 p.

4. Grigorenko T.V., Savostin G.G., Kalmykov A.G. et al., Domanic oil shale sediments organic matter and saturating fluids characteristics on the territory of the Tatarstan Republic (In Russ.), Georesursy, 2025, V. 27, No. 1, pp. 221–235, DOI: https://doi.org/10.18599/grs.2025.1.25

5. Hantschel T., Kauerauf A.I., Fundamentals of basin and petroleum systems modeling, Springer-Verlag Berlin Heidelberg, 2009, 492 p.

6. Emel’yanenko O.A., Khafizov S.F., Kalmykov G.A. et al., Promising hydrocarbon systems of the Mangyshlak oil and gas basin (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2025, No. 5, pp. 32–37, DOI: https://doi.org/10.24887/0028-2448-2025-5-32-37