The authors discuss common structural features and petroleum potential of the Upper Devonian-Tournaisian carbonate clinoform sequences well represented in the near-flank zones of Kamsky-Kinelsky trough system in the Volga-Urals Petroleum Province. Characteristics of reservoir types and special features of their occurrence within clinoform sequences (hydrocarbon stratigraphic traps) are presented. The authors recite the criteria for their identification using drilling and seismic data. Methodology of reference geological and geophysical section development for different depositional zones of the paleobasin is applied; the mentioned zones are: outer, inner near-flank and central zones of Kamsky-Kinelsky pale otroughs, and slopes of South Tatarsky, North Tatarsky, and Bashkirsky paleoarches. Lithofacies characterization of Upper Devonian-Tournaisian deposits of the Aktanysh-Chishminsky paleotrough and South Tatarsky paleoarch are presented. The authors discuss main rock types that compose clinoform bodies of submarine fans (clastic carbonate material) on the outer slopes of paleoarches and in the near-flank zones of paleotroughs. Lithofacies models showing the structure of main depositional zones and evolution of the sedimentation basin in the Middle – Later Frasnian, Famennian, and Tournaisian time are created. Geoseismic criteria for carbonate clinoform bodies identification and mapping are pointed out. Basing on the integrated interpretation of the recent 2D seismic and drilling data, prediction of stratigraphic traps in the Famennian and Tournaisian carbonate clinoforms on the slope of South Tatarsky arch and in the Blagoveschensky depression is conducted.

Natalya K. Fortunatova  Scopus
Doctor of Geological and Mineralogical Sciences,
Deputy Director General
All-Russian Research
Geological Oil Institute,
36, Shosse Entuziastov, Moscow, 105118, Russia
e-mail: fortunatova@vnigni.ru

​Marina А. Bushueva 
Head of Sector
All-Russian Research
Geological Oil Institute,
36, Shosse Entuziastov, Moscow, 105118, Russia
e-mail: bushueva@vnigni.ru

Aleksandr S. Kanev Scopus
Head of Sector
All-Russian Research
Geological Oil Institute,
36, Shosse Entuziastov, Moscow, 105118, Russia
e-mail: alexandr_kanev@bk.ru

Grigorii A. Belousov
Candidate of Technical Sciences,
Leading Researcher
All-Russian Research
Geological Oil Institute,
36, Shosse Entuziastov, Moscow, 105118, Russia
e-mail: belousov@vnigni.ru

Anna V. Baranova
Head of Group
All-Russian Research
Geological Oil Institute,
36, Shosse Entuziastov, Moscow, 105118, Russiae-mail: baranova@vnigni.ru

Nataliya Yu. Kholmyanskaya
Senior Researcher
All-Russian Research
Geological Oil Institute,
36, Shosse Entuziastov, Moscow, 105118, Russia
e-mail: natahol@vnigni.ru

1. Grachevskii M.M. Osobennosti stroeniya i formirovaniya Kamsko-Kinel’skoi vpadiny v Kuibyshevskom Zavolzh’e i Tatarii [Structural features and character of Kamsky-Kinelsky depression formation in Kuibyshevsky Transvolga Region and Tataria]. Doklady AN SSSR. 1959;114(5):1311–1314. In Russ.
2. Mkrtchyan O.M. Zakonomernosti razmeshcheniya strukturnykh form na vostoke Russkoi platformy [Common factors of structural forms occurrence in the eastern Russian Platform]. Moscow: Nauka; 1980. 134 p. In Russ.
3. Mkrtchyan O.M. Paleostrukturnyi analiz rannikh etapov formirovaniya paleozoiskogo chekhla Volgo-Ural’skoi oblasti [Paleostructural analysis of early stages of Palaeozoic sedimentary cover formation in Volga-Urals region]. In: Geostrukturnyi analiz Volgo-Ural’skoi neftegazonosnoi oblasti. Moscow: Nauka; 1977. pp. 30–45. In Russ.
4. Khachatryan R.O., Gromeka V.I. Morfologicheskie tipy lokal’nykh podnyatii i ikh prostranstvennoe razmeshchenie v Kamsko-Kinel’skikh progibakh [Morphological types of local uplifts and their spatial location in Kamsky-Kinelsky troughs]. In: Tektonicheskoe razvitie i sovremennaya struktura neftegazonosnykh oblastei Vostochno-Evropeiskoi platformy. Moscow: Nauka; 1965. 333 p. In Russ.
5. Khat’yanov F.I., Ivanova Z.S., Shalaginova F.P. O vostochnom prodolzhenii fatsial’nykh depressii Kamsko-Kinel’skoi sistemy [Eastern extension of facies depressions in Kamsky-Kinelsky system]. Geologiya nefti i gaza. 1968;(8):11–16. In Russ.
6. Provorov V.M., Fedorchuk 3.A., Burykina A.E. O poiskakh devonskikh struktur pod rifogenno-karbonatnymi massivami v Kamsko-Kinel’skoi
sisteme vpadin [Prospecting for Devonian structures below reef-carbonate massifs in Kamsky-Kinelsky paleodepression system]. In: Trudy
VNIGNI. Perm’; 1973. Issue 123. pp. 94–100. In Russ.
7. Voitovich E.D. Tektonika osadochnogo chekhla. Kamsko-Kinel’skaya sistema progibov [Tectonics of sedimentary cover. Kamsky-Kinelsky
paleotrough system]. In: Geologiya Tatarstana. Stratigrafiya i tektonika. Moscow : GEOS; 2003. pp. 330–331. In Russ.
8. Mirchink M.F., Mkrtchyan O.M., Trokhova A.A. Paleotektonicheskie i paleogeomorfologicheskie osobennosti domanikovogo basseina
Volgo-Ural’skoi oblasti [Paleotectonic and paleogeomorphological features of Domanik basin in Volga-Urals region]. Izvestiya AN SSSR. Seriya
geologicheskaya. 1975;(12):9–18. In Russ.
9. Varlamov A.I., Petersilye V.I., Poroskun V.I., Fortunatova N.K., Komar N.V., Shvets-Teneta-Guriy A.G. Technique of oil reserves estimation in domanik deposits. Geologiya nefti i gaza. 2017;(5):51–65. In Russ.
10. Fortunatova N.K., Varlamov A.I., Kanev A.S., Poroskun V.I., Baranova A.V., Bushueva M.A. Structure and assessment of the oil potential of carbonaceous carbonate-siliceous domanik deposits in the Volga–Ural oil and gas province. Russian Geology and Geophysics. 2021;62(8):929–946. DOI: 10.2113/RGG20214351.
11. Fortunatova N.K., Zaitseva E.L., Bushueva M.A. et al. Stratigrafiya verkhnego devona Volgo-Ural’skogo subregiona (materialy po
aktualizatsii stratigraficheskikh skhem) [Devonian stratigraphy of Volga-Ural subregion (stratigraphical sectional planes update materials)].
Moscow: VNIGNI; 2016. 176 p. In Russ.
12. Fortunatova N.K., Zaitseva E.L., Kononova L.I., Baranova A.V., Bushueva M.A., Mikheeva A.I., Afanas’eva M.S, Obukhovskaya T.G.
Litologo-fatsial’naya i biostratigraficheskaya kharakteristika verkhnedevonskikh otlozhenii opornoi skvazhiny 1 Melekesskaya (Melekesskaya
vpadina, Volgo-Ural’skaya oblast’) [Lithofacies and biostratigraphy characteristics of Upper Devonian rocks taken from 1 Melekesskaya
key well ( Melekesskaya depression, Volga-Urals region)]. Byulleten’ moskovskogo obshchestva ispytatelei prirody. Otdel geologicheskii.
2018;93(5–6):3–49. In Russ.
13. Fortunatova N.K., Shvets-Teneta-Gurii A.G., Bushueva M.A., Kanev A.S., Luchina S.A., Avdeeva A.A., Volodina A.G., Kholmyanskaya N.Yu. Methodology of lithologically screened and lithological oil and gas traps prediction in Upper Devonian-Tournaisian and Lower Permian carbonate plays of eastern Volga-Urals Petroleum Province. Geologiya nefti i gaza. 2019;(3):23–38. DOI: 10.31087/0016-7894-2019-3-23-38. In Russ.
14. Mutti E. Turbidite sandstones. Milan : San Donato Milanese; 1992. P. 275.
15. Fortunatova N.K. Perspektivy prognoza, poiskov i osvoeniya mestorozhdenii uglevodorodov v otlozheniyakh karbonatnykh konusov
vynosa [Prospects for prediction, exploration, and development of hydrocarbon fields in deposits of carbonate fans]. Ekaterinburg: Izdatelstvo
Gornogo universiteta; 2007. Issue 1 (17). pp. 46–54. In Russ.
16. Fortunatova N.K. Sedimentation models of carbonate alluvial fans — new oil and gas exploration objects. Geologiya nefti i gaza. 2007;(2):59–66. In Russ.