Romgaz had planned in 2006 to explore gas fields in eight areas throughout Romania, said the company's general manager Francisc Toth.
Seven gas fields had been found, he added.
The state-owned corporation is Romania's largest producer and supplier of natural gas, taking up 41.2 percent of the domestic market.
Romania is one of the few European countries which have natural gas resources.
With annual gas production of 10 billion cubic meters, 60 percent of the country's domestic demands can be fulfilled.