Assessment of the prospects for oil-bearing deposits of the Visean stage of the Western Zakamya region at the Tatarstan Republic

Abstract

The structure of geological sections of the Visean stage of small oil fields in the Western Zakamya region of the Tatarstan Republic is considered. It has been established that potentially oil-bearing deposits are carbonate-terrigenous deposits of the Tulian-Bobrikian horizon and carbonate deposits of the Aleksininian horizon. In the Tulian-Bobrikian sediments, oil deposits are localized in fine-grained quartz sandstones, the cap rocks are dense claystones. Due to the small thickness of the layers of oil-saturated sandstones, their development is not very promising. In the deposits of the Aleksininian horizon, oil deposits are localized in cavernous limestones overlain by dense diagenetic dolomites. The thickness of the oil reservoirs is 2.0-2.5 m, which allows them to be considered as potential targets for development. The presence of sulfate mineralization in the pores of reservoir rocks suggests that the oil deposits of the Aleksininian horizon are at the initial stages of waterflooding..