ExplorationTurkey boosts Black Sea gas resources to 25 Tcf after new discovery and reserve upgradeCaycuma-1 probe hits 2 Tcf of gas while Sakarya reserves increase by 4 TcfGas announcement: Turkish President Recep Tayyip Erdogan (centre) flanked by Energy Minister Fatih Donmez (left) and Deputy Prime Minister Mehmet Simsek.Photo: REUTERS/SCANPIXIain EsauLondon