The Influence of the Rock Stress State on Matrix and Fracture Permeability under Conditions of Various Lithofacial Zones of the Tournaisian–Fammenian Oil Fields in the Upper Kama Region

A series of core experiments has made it possible to establish that for fractured samples, reservoir properties decrease sharply as their stress state (effective pressure) increases. With a further decrease (or complete removal) of the stress state, reservoir properties are not recovered in fractured reservoirs. These experiments have scientific and practical importance for the optimization of practices of production-well operation in the Tournesian–Famennian fractured reservoirs.