Iranian Oil Minister Kazem Vaziri-Hamaneh said Friday that Japan has until the end of the month to finalize a $2 billion deal to develop the giant Azadegan oil field, Iran's Fars News Agency reported.

Iran and Japan reached an agreement several days ago on extending by 15 days the original Sept. 15 deadline, the report quoted Vaziri-Hamaneh as saying.

Japan's Inpex Corp., which holds the concessions for developing the oil field in southwestern Iran, should finalize the deal by the end of this month, he said.

The Azadegan field is one of the world's largest, with estimated crude oil reserves of 26 billion barrels.