Updated model of carbonate reservoirs permeability and porosity of the oil field within the northern end of the Sorokin Swell (Timan-Pechora oil and gas province)

The article presents the results of the carbonate reservoirs permeability and porosity model detailing of the oil field in the Timan-Pechora oil and gas province in relation to their formation features and secondary changes. The object of study is Upper Carboniferous — Lower Permian carbonate reservoirs. The resulting model shows the spatial localization of different lithological types of reservoir rocks, as well as the effect of fracturing on the permeability. The relevance of this study conditioned by the fact that the modeling results are the basis for identifying prospect areas for production level ensuring in the Upper Carboniferous reservoir. In the course of the study, the classification of reservoir rocks according to core data is carried out; the distribution of various lithological types of limestone in the area and in the section has been established; the predominant type of voidness and the characteristic range of filtration and capacity properties for each selected lithological type have been determined. In addition, fractures are classified according to core data and reservoir microimages, the relationship between the fracturing density and the rock bulk density and primary porosity has been established, and the positive effect of fracture paragenesis on the permeability of low-capacity reservoirs has been confirmed.