Stratigraphic interval from Middle Pliocene to Quaternary, with thickness 4300 m, was drilled and studied in detail. Key oil-bearing horizon Productive Series (PS), with thickness 2800-3000 m was drilled in wells NN 1, 3, 5, 11, 15, 16, 18, 21, 23, 28. In terms of lithology this section is represented by rhythmic alternation of argillaceous and sandy-aleurite rocks. In terms of tectonics, it is brachyanticline (structural) reservoir of sublatitudinal strike, with longitudinal and transverse faults with the amplitude 20-350 m. Commercial oil accumulation was discovered here for the first time on the north-western pericline of the field (1979, well N 4, X horizon). Later, testing of prospecting-exploration wells demonstrated that the reservoir was multilayer: gas-condensate pools (V, VI horizons), oil pools (VIII, IX, X horizons, Pereriv Suite) were identified in the upper division of PS, oil-gas-condensate pools (NKP, PK) in the lower division of PS.


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