Occidental Petroleum Corp., the fourth-largest U.S. oil producer, will sell its stake in the 4-billion-barrel Zubair oil field to Iraq’s state-run South Oil Co. (SOC), Iraqi oil officials said Nov. 11.

“Occidental asked the ministry for permission to sell its stake in Zubair field and the ministry is in the process of approving the request. South Oil Company will acquire Occidental’s stake,” ministry spokesman Asim Jihad said.

Occidental sought permission in mid-October, two SOC officials said.

Reuters could not immediately reach officials at Occidental for comment. Senior Occidental executive Vicki Hollub said last month the company was interested in selling non-core assets in the Middle East.

Occidental holds 29.69 percent of the field in southern Iraq. Italy’s Eni operates the field and holds 41.56 percent, while South Korea’s KOGAS has 23.75 percent and Iraq’s state-run Missan Oil Co. owns 5 percent.

Eni, Occidental Petroleum Corp. and KOGAS signed a 20-year deal with Iraq in 2010 to develop Zubair. The oil field is pumping around 352,000 barrels per day, the SOC officials said.