petroleum province, the Republics of Bashkortostan and Tatarstan, and demonstrate the
important role played by Academicians IM Gubkin and AA Trofimuk in these discoveries.
Special focus is placed on the analysis of small and smallest oil fields and the sequence of
their discovery. It was shown that all discoveries in Tatarstan and Bashkortostan were the
result of the exploration filter. It was also shown that the establishment and support of small …