The role of lithological factors in the formation of carbonate reservoirs of the Nepsky arch (Eastern Siberia)

Litologo-facial characteristic of the erbogachensky, preobrazhensky and ust-kutsky productive horizons of Vendian and the lower Cambrian, discovered by wells in the territory of the Nepsky arch, is given. It is foundthat the deposition occurred within large bars systems and stromatoliticbuildings separated shallow lagoons and tidal flats. Revealed sedimentary and post-sedimentary factors, which influenced on the formation of reservoir properties ofcarbonate sediments. It isshown that the combination of cyclic sedimentation and development of secondary changes in rocks was reflected in a section by alternation of reservoirs with various genesis and quality. It isstablished that the most intensive demonstration of a post-sedimentary salinization is observed near a fault zone.