Typification of oil and gas accumulations relative to components of Upper Devonian–Lower Carboniferous organogenic buildups within the Nizhnekamsk trough

UDK: 553.982.23

DOI: 10.24887/0028-2448-2026-5-64-70

Key words: organogenic buildups, the Kama-Kinel trough system (KKTS), the Nizhnekamsk uncompensated trough, the Volga-Ural petroleum and gas province, drape structures, slope facies, an applied typification of oil and gas accumulations (hydrocarbon traps), hydrocarbon traps

Authors: A.M. Kalimullin(TatNIPIneft, RF, Almetyevsk); A.F. Safarov (TatNIPIneft, RF, Almetyevsk); A.I. Khaidarova (TatNIPIneft, RF, Almetyevsk); G.R. Bazarbaeva (TatNIPIneft, RF, Almetyevsk); R.O. Makhortov (TatNIPIneft, RF, Almetyevsk); T.A. Arslanov (TatNIPIneft, RF, Almetyevsk); A.N. Kolchugin (Kazan (Volga Region) Federal University, RF, Kazan); M.F. Validov (Kazan (Volga Region) Federal University, RF, Kazan); B.G. Ganiev (TATNEFT PJSC, RF, Almetyevsk); A.A. Lutfullin (TATNEFT PJSC, RF, Almetyevsk); R.M. Kabipov (TATNEFT PJSC, RF, Almetyevsk); K.D. Shumatbaev (TATNEFT PJSC, RF, Almetyevsk)

An applied typification of oil and gas accumulation zones (hydrocarbon traps) is proposed based on their location relative to the structural components of Upper Devonian – Lower Carboniferous organogenic buildups in the Kama-Kinel trough system (KKTS) of the Volga-Ural petroleum and gas province (on the example of the Nizhnekamsk trough and its junction zones with the Sarapul and Aktanysh-Chishminsky troughs). The classification is intended for practical identification of productive intervals and cap rocks within organogenic massifs and related facies. Interpretation of seismic surveys, well logging data, test results, and field information, combined with comparison with regional schemes for the typification of organogenic buildups and reef reservoirs, enabled linking morphogenetic type and stratigraphic position of buildups with the components of the petroleum system: reservoir rocks and sealing rocks. Five types of oil and gas accumulation zones (hydrocarbon traps) were determined for the various components of organogenic buildup: intra-reef, supra-reef, sub-reef, peri-reef and mixed. It was found that within the Nizhnekamsk trough, supra-reef and multilayer cases are predominantly identified, whereas intra-reef productivity is localized and requires separate verification based on reservoir properties and sealing rock characterization. Peri-reef bodies are generally the targets for seismic facies prediction and can form reservoirs as well as lateral barriers (facies change zones). The proposed typification scheme sets unified criteria for the comparison of Late Devonian – Early Carboniferous organogenic buildups (reefs, bioherms, carbonate mounds, pinnacles, etc.) and related carbonate and organogenic carbonate systems, and can be used for ranking of prospective targets and exploration planning within the KKTS.

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