Iran's President Hassan Rouhani inaugurated five new phases of the South Pars gas field today, the result of some USD 20 billion in investment, local media reported.
"Our production has reached 575 million cubic metres per day," said Rouhani.
Iran's total gas production is 885 million cubic metres per day.
"At the height of sanctions, with the help of Iranian engineers and workers, we succeeded in developing 11 phases of South Pars," added Oil Minister Bijan Namadar Zanganeh.
South Pars is the largest known gas reservoir in the world.
In November, French firm Total signed a preliminary accord worth an estimated USD 4.8 billion (4.5 billion euros) to help develop phase 11 of South Pars, but has since said it will wait for signals from Washington before finalising the deal.
Although many sanctions, including on Iran's energy industry, were lifted under a nuclear deal with world powers in 2015, the US has maintained a raft of its own sanctions that continue to hamper investment and cause concern among foreign businesses.
In January, Tehran approved 29 international companies to bid for oil and gas projects.
However, it is still finalising a new contract for foreign investors - a process that has proved controversial in a country with strong memories of past exploitation by global oil firms.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)