The hydrocarbon productivity of Paleozoic carbonate reservoirs has been proved in the offshore prolongation of the Sorokin swell. The Prirazlomnoe oil field was discovered in 1989 by the prospecting well No.1 drilling to the depth 3100 m in the dome part of the anticline fold. The productive horizon is represented by two carbonate beds of different composition and origin. The upper highly porous bed of Asselian age is built by organogenic-clastic limestones and overlaid by shales of Artinskian-Kungurian age. The method of capillary saturation of rocks, designed to assess the structural features of the complex void space of a carbonate reservoir, enables to evaluate the ratio of voids of different types, namely the content share of pores, voids and fractures, i.e. to evaluate the complex reservoir type. This evaluation includes fractures of various orientation that determine the direction of filtration and isotropic rocks permeability, morphology and genesis of voids – the emergence of "newly generated" vug and development of the "inherited" vug; the characteristic of fractures variations with depth, different intensity of fractures in rocks and substantiation of rocks fractures changes in the reservoir


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