E A Korolev¹ , A A Eskin¹ , L V Muzalevskaya¹ , E R Barieva² and E A Serazeeva²

¹ Kazan Federal University, Institute of geology and petroleum technologies, 18, Kremlevskaya, Kazan, 420008, Russia

² Kazan State Power Engineering University, 51, Krasnoselskaya, Kazan, 420066, Russia

Abstract

Small oil fields in the western part of the Tatarstan Republic, localized within single brachyanticlinal structures, have been studied. The main productive oil deposits are confined to the deposits of the Tournaisian stage. The reservoir rocks are leached lumpy-peloid limestones, grainstones. Oil-saturated limestones are predominantly medium- and high-capacity reservoirs. Within the limits of oil deposits, oils are characterized by a weak oxidation state. Their composition is dominated by the middle fractions of hydrocarbons. Only in the bottom part of oil deposits near the oil-water contact is the prevalence of heavy hydrocarbons. This indicates that the oil deposits are in the early stages of formation water flooding. By analogy with the same small oil fields on the eastern side of the Melekesskaya depression, it can be expected that oil inflows will not exceed 6-8 tons/day.