Ufimian bituminous sandstones of the Republic of Tatarstan: lithological and petrophysical characteristics and formation history

Research subject. Bituminous sandstones of the Sheshmian horizon of the Ufimian stage in the Republic of Tatarstan.

Aim. To identify relationships between lithological and petrophysical parameters for paleoreconstructions of the conditions of formation and redeposition of natural bitumen deposits.

Materials and methods. The composition and internal structure of bituminous sandstones were studied by optical microscopy methods (petrographic description of thin sections) and thermogravimetry (quantitative parameters of oil saturation and carbonation), statistical processing of the results of granulometric and petrophysical analyses in Statistica 10 software.

Results. The studied sandstones belong to the graywacke group. Statistical analysis of granulometric and filtration-capacity parameters of bituminous sandstones revealed relationships between certain fractions and the degree of bituminosity. Cluster and factor analysis of lithologic and petrophysical data made it possible to identify integral indicators that can be used to reconstruct the paleofacies of the Sheshmian sandstones. The important role of the Sheshma River valley in the reformation of bitumen deposits in the Neogene-Quaternary time under the influence of Coriolis force has been established. Presence of soda water with high (more than 1 g/l) content of hydrocarbonate-ion is a hydrochemical criterion for searching the deposits of natural bitumen. The present study complements the existing hypotheses of the formation of the Sheshmian bituminous sandstones of the South Tatar arch.

Conclusion. Based on a combined analysis of geological data, lithological and petrophysical parameters, it is suggested that the most bitumen-saturated upper layer of sandstones was formed by eolian processes.

1. Baturin V.P. (1947) Petrographic analysis of the geologic past by terrigenous components. Moscow, Publishing House of the USSR Academy of Sciences, 339 p. (In Russ.)

2. Bazhenova O.K., Burlin Yu.K., Sokolov B.A., Khain V.E. (2012) Geology and Geochemistry of Oil and Gas. Moscow, MGU Publ., 432 p. (In Russ.)

3. Dudyak R., Mullakaev A., Khasanov R. (2020). Reconstruction of facies conditions of the sedimentation of bitumenbearing sandstones according to granulometry data (Volga-Ural oil and gas province, Russian Federation). IOP Conf. Ser.: Earth Environ. Sci., 516, 012001. https://doi.org/10.1088/1755-1315/516/1/012001

4. Ellern S.S. (1980) Conditions of formation of paleogeomorphologic traps of oil and gas in the Upper Permian sediments of the Volga-Ural region. Tr. VNIGNI, 216. (Paleogeomorphologic methods in petroleum geology). Мoscow, 38-44. (In Russ.)

5. Forsh N.N. (1955) The Ufimian Formation and the Kazanian Stage. Leningrad, Gostoptekhizdat Publ., 156 p. (In Russ.)

6. Methodical instructions for fractional granulometric analysis by sedimentation method (using hydraulic sedimentator GS-1). (1989) (Ed. K.K. Gostintsev). Leningrad, VNIGRI Publ., 191 p. (In Russ.)

7. Mullakaev A.I., Khasanov R.R. (2019) Thermal properties of the bituminous sandy rocks of the Volga-Ural oil and gas province. IOP Conf. Ser.: Earth Environ. Sci., 282(1), 012024. https://doi.org/10.1088/1755-1315/282/1/012024

8. Ignat’ev V.I. (1976) Formation of the Volga-Ural Anteclise in the Permian. Kazan, Publishing House of the Kazan University, 256 p. (In Russ.)

9. Kashtanov S.G., Bulychev M.M. (1971) Conditions of occurrence and hydrochemical zonality of Paleozoic groundwater in the northern part of the Melekessky artesian basin. Issues of hydrogeology and geotectonics. Kazan, Publishing House of the Kazan University, 3-15. (In Russ.)

10. Khasanov R.R., Mullakaev A.I., Dusmanov E.N. (2017) Composition of sandstones in productive horizons of Permian bituminous deposits of Tatarstan. Uchenye Zapiski Kazanskogo Universiteta. Ser. Estestvennye Nauki, 159(1), 164-173. (In Russ.)

11. Khisamov R.S., Gatiyatullin R.S., Liberman V.B. et al. (2006) Mineral and raw material base of the Republic of Tatarstan. Kazan: Fen Publ., Academy of Sciences of the Republic of Tatarstan, 320 p. (In Russ.)

12. Khisamov R.S., Shargorodskii I.E., Gatiyatullin N.S. (2009) Petroleum bituminosity of Permian sediments of the South Tatar vault and Melekesskaya depression. Kazan, Fen Publ., Academy of Sciences of the Republic of Tatarstan, 431 p. (In Russ.)

13. Mullakaev A.I., Khasanov R.R. (2019) Signs of aeolian influence on the formation of coastal-marine sandy sediments in Permian time (Tatarstan, Russia). Uchenye Zapiski Kazanskogo Universiteta. Ser. Estestvennye Nauki, 161(1), 128-140. (In Russ.) https://doi.org/10.26907/2542-064X.2019.1.128-140

14. Muslimov R.H., Romanov G.V., Kayukova G.P. et al. (2012) Integrated development of heavy oils and natural bitumens of the Permian system of the Republic of Tatarstan. Kazan, Fen Publ., Academy of Sciences of the Republic of Tatarstan, 396 p. (In Russ.)

15. Nurgalieva N.G., Ikhsanov N.A., Nurgaliev D.K., Dautov A.N. (2016) Facies characterization of sheshmian bituminous deposits. Neftyanoe Khozyaistvo, (4), 72-75. (In Russ.)

16. Shalin P.A. (1988) On the nature of palegeomorphologic traps of oil and bitumen in the Sheshma horizon of the South Tatar Vault. Geologiya Nefti i Gaza, (5), 35-38. (In Russ.)

17. Shvetsov M.S. (1958) Petrography of sedimentary rocks. Moscow, Gostoptekhizdat Publ., 416 p. (In Russ.)

18. Sungatullin R. Kh. (2010a) Mineral drinking waters of the Republic of Tatarstan. Uchenye Zapiski Kazanskogo Universiteta. Ser. Estestvennye Nauki, 152(3), 223-237. (In Russ.)

19. Sungatullin R.Kh. (2010b) Oil deposits and chemical elements in near-surface geospheres. Razvedka i Okhrana Nedr, (2), 12-17. (In Russ.)

20. Sungatullin R.Kh., Burov B.V., Sungatullina G.M. (2008) Geology of the Republic of Tatarstan. Kazan, Publishing House of the Kazan University, 72 p. (In Russ.)

21. Trask P.D. (1932) Origin and Environment of Source Sediments: The Gulf Publishing Company, Houston, Texas, 323 p.

22. Uspenskii B.V., Valeeva I.F. (2008) Geology of natural bitumen deposits of the Republic of Tatarstan. Kazan, PF “Gart” Publ., 347 p. (In Russ.)

23. Uspenskii B.V., Vafin R.F., Morozov V.P. (2016) Dependence of reservoir properties of rocks of the Ashalchinskoe pack on the conditions of its formation. Neftyanoe Khozyaistvo, (7), 69-71. (In Russ.)

24. Yakutseni V.P., Petrova Yu.E., Sukhanov A.A. (2009) Unconventional hydrocarbon resources – a reserve for replenishing the raw material base of oil and gas in Russia. Neftegazovaya Geol. Teoriya i Praktika, 4(1), 1-14. (In Russ.)