The article addresses the shift of geological exploration focus from the barrier carbonate massifs of the Sarapul depression of the Kama-Kinel system (Udmurtia) toward the near terraces of the Late Devonian-Tournaisian paleoshelf. Within the latter, widespread local organogenic structures of Famennian age were observed, traditionally associated with the oil and gas potential of reservoirs within the structures enclosing them in carbonate deposits of the Middle, Lower Tournaisian and Upper Famennian substages. Recent exploratory drilling at the Sharkansky site, with complete penetration of Frasnian-Famennian deposits in one of the aforementioned structures, confirmed the forecast of commercial oil potential in the Lower Famennian reservoirs and outlined the productivity potential of the Middle Famennian section. A general analysis of accumulated data on the Volga-Ural petroleum province shows that, within the ridges of swell-like uplifts, there are almost no deposits with accumulations in the lower half of the Famennian stage, but they are widely spread in offshore paleoshelf areas. A decrease (subsidence) of the oil-bearing stage is noted with distance from the barrier swells toward the shallow shelf. For the territory of Udmurtia, two types of structures were identified based on their genesis: associated with draping of submeridional swells and biohermal bodies. For the latter, the main characteristics and criteria for oil potential were outlined.
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