On 4 December 2017, Rosneft reported a new oil discovery in the Gerasimovskiy Zapadnyy license in Tyumen Oblast (Western Siberia). It is supposed that an exploratory well Bolsheturtasskaya 26 drilled by RN-Uvatneftegaz tested oil from the Tyumen Yu2 reservoir. Recoverable 3P oil reserves of the discovery, named im. Yu. V. Oznobikhina, are estimated at 9.5 MMbbl. This is the third field in the Uvat project discovered by Rosneft in 2017. In August, Rosneft reported two oil discoveries - Imgytskoye in the Gerasimovskiy Vostochnyy license and im. Parasyuka in the Tamarginskiy-Bolotniy Severnyy license. Total recoverable oil reserves of the discoveries are estimated at 38 MMbbl. RN-Uvatneftegaz is operating the 26,600 sq km Uvat project which combines 20 licenses in the southern part of the West Siberian Basin. Remaining 3P oil reserves of the project area are estimated at 2.6 Bbbl. In 2016, oil production amounted to 11.6 MMt (232 Mbo/d). Â 
Russia (West Siberian B.) Bolsheturtasskaya 26 op. by RN UVAT (100.0%) in Gerasimovskiy Zap. block