The concept of the formation of the Kama-Kinel depression system from the standpoint of tectonics and sedimentation features in the Late Devonian

The origin of the Kama-Kinel system of depressions (KKDS), a system of sub-latitudinal channels that control the position of oil deposits in the Domanik high-carbon formation (DHCF), was considered. The work compares existing hypotheses with data on lithological indicators (tempestites, calciturbidites, spiculites), paleogeographic reconstructions and analogies with Riphean aulacogens. It turned out that the riftogenic factor was secondary. Climate and sedimentary processes came to the fore: storm activity and trade winds. In the shallow basins of the low latitudes of Laurussia, they caused anoxia, accumulation of kerogen, and clinoform filling of depressions. In the axial zones of KKDS, the thickness of the deposits is 30-40 m, which is noticeably lower than the economically justified threshold for multi-stage hydraulic fracturing (about 80 m). Nevertheless, it is precisely to such sections that the new fields put on the balance sheet in 2017-2019. in the Orenburg and Samara regions. The results obtained can be used in the forecast of unconventional oil deposits in high-carbon carbonate-siliceous strata of the VolgaUral province. The formation and evolution of KKDS appears to have been determined by paleohydrodynamics and climate rather than an inherited fault structure.

1. Aliyev M.M., Batanova G.P., Khachatryan G.R. et al. Devonian deposits of the Volga-Ural oil and gas province. M.: Nedra, 1976. – 216 p.

2. Belyaeva N.V., Stashkova E.K. Sedimentation model of the Frasnian-Tournaisian deposits of the Kalinin Depression in the system of the Kamsko-Kinelsky troughs. Yekaterinburg, 1999. – 123 p.

3. Vaksman S.I. Formation of linear mobile zones in the sedimentary cover of the Volga-Ural province. //Geology of oil and gas. 1989. № 9. from. 15–18.

4. Valeev R.N. Avlakogenes of the East European Platform. M.: Nedra, 1978. – 151 p.

5. Varlamov A.I., Melnikov P.N., Poroskun V.I., Fortunatova N.K., Petersilye V.I., Iutina M.M., Dakhnova M.V., Vitsenovsky M.Yu., Kanev A.S., Soboleva EN., Shalov A.V. Omeenko. Results of Study and Prospects of Development of Unconventional Oil Deposits in High-Carbon Carbonate-Siliceous Deposits of Domanik Formation of Volga-Ural Province//Geology of Oil and Gas. – 2020. – № 6. – pp. 33-52. DOI: 10.31087/0016-7894-2020-6-33-52.

6. Garetsky R.G., Kiryukhin L.G., Kapustin I.N., Konischev V.S. Uncompensated deflections of the East European platform. Minsk: Science and Technology. 1990. – 102 p.

7. Zakharov V.A. Depths of basins and approaches to their reconstruction/Paleontology, stratigraphy and astrobiology. To the 80th anniversary of academician A.Yu. Rozanov. M.: PIN RAS, 2016. p. 208-228.

8. Kozhanov D.D., Bolshakova M.A. A brief history of the study of the oil and gas potential of the VolgaUral basin. A look from the XXI century//Bulletin of Moscow. University. Series 4. Geology. 2023, № 5. from. 117-128.

9. Kolchugin A.N., Safarov A.F., Validov M.F., Kalimullin A.M., Ganiev B.G., Lutfullin A.A., Shumatbaev K.D., Khabipov R.M., Khaidarova A.I., Korolev E.A., Khayuzkin A.S. Late Famennian-Tournaisian formation model within the axial and lateral zones of the Saraylinsky trough (Republic of Tatarstan). Geo-resources. 2025;27(1):208-220. https://doi.org/10.18599/grs.2025.1.24

10. Milanovsky E.E. Geology of the USSR. PART I, M.: Publishing House of Moscow State University. 1987. – 416 p.

11. Rodionova G.D., Umnova V.T., Kononova L.I., Ovnatanova N.S., Rzhonsnitskaya M.A., Fedorova T.I. Devon Voronezh anteclise and Moscow syneclise. M.: Science, 1995. – 265 p.

12. Timan-Pechora sedimentation basin. Atlas of geological maps. Ed.: Bogatsky V.I., Larionova Z.V. Ukhta: Publishing House of TP SIC, 2000. – 122 p., 65l.

13. Fokin P.A., Nikishin A.M. Tectonic development of the East European platform in the Devonian – early Carboniferous//Vestnik Mosk. University. Series 4. Geology. 1999, № 6. from. 9-20.

14. Chuvashov B.I. Paleozoic carbonate platforms of the Ural mobile belt and its framing (late Devonian and early Carboniferous carbonate platforms) in the book: Sedimentary basins of the Urals and adjacent regions: structural patterns and mineralogy. Yekaterinburg, 2000, p. 68-87.

15. Khain V.E., Lomize G. Geotectonics with the basics of geodynamics: textbook. M.: Publishing House of Moscow State University. 1995. – 480 p.

16. Chuvashov B.I. Development history and bionomic characteristics of the late Devonian basin on the western slope of the Middle and Southern Urals. M.: Science, 1968. – 132 p.

17. Chuvashov B.I. Paleozoic carbonate platforms of the Ural movable belt and its borders (late Devonian and early Carboniferous carbonate platforms)/В: Sedimentary basins of the Urals and adjacent regions: structural patterns and mineralogy. Yekaterinburg, 2000, p. 68-87.

18. Shatsky N.S. The main features of the structure and development of the East European platform//Rev. USSR ACADEMY OF SCIENCES. Ser. geol. 1946, № 1.

19. Shilyaev S.A. On the question of the genesis of the Kama-Kinel deflection system. – Book: Geology and Development of Oil Resources in the Kama-Kinel Trough System. M.: Science, 1991. from. 124-128.

20. Ellern S.S. Uncompensated deflections of ancient platforms – specific structures of the transitional stage. – In the book: Uncompensated structures of ancient platforms and their oil and gas content. Kazan, 1976. from. 3-26.

21. Blakey R.C., Ranney W.D. Ancient landscapes of Western North America. Springer, Cham. 2018. – 228p.

22. Elrick M., Gilleaudeau J., Romaniello S.J., Algeo T.J., Morford J.L., Sabbatino M., Goepfert T.J., Cleal C., Cascales-Minana B., Chernyavskiy P. Major Early-Middle Devonian oceanic oxygenation linked to early land plant evolution detected using hogh-resolution U isotopes of marine limestones. Earth and Planetary Science Letters, Elsevier, 2022, 581. 10.1016.j.epsl.2022.117410 hal-03781208

23. Flügel E. Microfacies of Carbonate Rocks, Analysis, Interpretation and Application. Springer-Verlag. Berlin. 2004. 633 p.

24. Fokin P.A., Nikishin A.M., Ziegler P.A. PeriUralian and Peri-Palaeo-Tethyan rift systems of the East-European Craton. In: P.A. Ziegler, W. Cavazza, A.H.F. Robertson & S. Crasquin-Soleau (eds), Peri-Tethys Memoir 6 (2001): Peri-Tethyan Rift/Wrench Basins and Passive Margins. Mem. Mus. natn. Hist. Nat., Paris. Vol. 186. p. 347-368.

25. Golonka J. Phanerozoic Paleoenvironment and Paleolithofacies Maps. Late Paleozoic //Geologia, 2007, vol. 33, Zeszyt 2, p. 145-209.

26. McKenzie D. Some remarks on the development of sedimentary basins // Earth and Planetary Sciences letters, 1978, vol. 40. p. 25-32.

27. Meischner, K.-D. Allodapische Kalke. Turbidite in riffnahen Sedimentationsbecken. – In: Bouma, A.H., Brouwer, A. (eds.): Turbidites. Developments in Sedimentology, 1964, vol. 3, 156-191.

28. PALEOMAP PaleoAtlas for GPlates and the PaleoData Plotter Program http://www.earthbyte.org/paleomap-paleoatlas-for-gplates/ by Christopher R. Scotese, PALEOMAPProject February 16, 2016.

29. Scotese C.R., McKerrow W.S. Revised world maps and introduction. In: McKerrow W.S. and Scotese C.R. (eds.) Palaeozoic palaeogeography and biogeography. Geological Society of London. Memoirs, 1990, vol. 12. p. 1-21.

30. Smart M., Filippelli G., Gilhooly W.P., Marshall J.E.A., Whiteside J. Enhanced terrestrial nutrient release during the Devonian emergence and expansion of forests: evidence from lacustrine phosphorus and geochemical records. Geological Society of America Bull. 2022, http://pubs.geoscienceworld.org/gsa/gsabulletin/articlepdf/doi/10/1130/B36384.1/5735864/b36384/pdf