Iran's oil reserves stand at 158 billion barrels, FNA reported.
Last October Iran upped its reserves figure to 150.31 billion barrels from a previous estimate of 138 billion barrels.
The report by the Iranian students news agency (ISNA) quoted Oil Minister Rostam Qassemi as saying his plan to concentrate on extracting crude from fields shared with other countries would boost production.
"By the end of the Fifth Development Plan (2010-2015), the country's oil production must increase to 5.2 million barrels per day (bpd) and this should happen from the country's joint fields," it quoted Qassemi as saying.
Hormoz Qalavand, head of the state-run National Iranian Southern Oil Company told FNA on Wednesday that Iran's current output stands at 3.92 million bpd.