Vendian to Cambrian carbonate reservoir types of the Siberian Platform

Three types of carbonate reservoir have been recognized in the central and southern part of the Siberian platform based on their structure, reservoir properties and the type of internal migration: multilayer, massive and single-layer. Facies conditions determined the sedimentation mechanisms: biogenic in normal salinity zones and chemogenic in higher salinity zones. Chemogenic sedimentation produced micritic dolomites and limestones with intercrystalline porosity, smaller pores and low porosity and permeability. Biogenic sedimentation resulted in the formation of large interstices and reservoir properties that are significantly higher. As a result of salinity changes, the reservoir properties of similar facies (shallow water, relatively deep water and reefal) worsen towards the south and southwest.