After almost two years of talks, the holder of the world’s fourth-biggest crude reserves will benefit from an easing of international sanctions on exports in return for curbs on its nuclear program, according to an official involved in the talks in Vienna. Iranian Oil Minister Bijan Namdar Zanganeh says the country can increase exports by 500,000 barrels a day as soon as sanctions are lifted, and then an additional 500,000 a day in the following six months. Iran produced an average of 2.8 million barrels a day this year.