It is shown, that small in size and in reserves volume complex oil pools in locally oil bearing formations could become an additional source of hydrocarbon resources. It is noted, that revision of geological-geophysical data on all available well stock of the oldest oil field in Volga-Urals province has enabled to increase commercial recoverable reserves by 389 million tones for a number of different formations. Presented are measures for additional exploration of these pools, so as to put them on production.