Wintershall blames 'blockade' on oil terminals in Libya for shutdown KASSEL, Germany, Nov. 25 (UPI) -- German energy company Wintershall said Monday it wasn't sure how long oil production in Libya would be offline because of a blockade on export terminals. "Due to the protracted blockade of the export terminals at the coast, Wintershall has had to suspend its onshore production several weeks ago already," the company said in a statement emailed to United Press International. It is currently unclear when the blockade of the export terminals will be lifted and how quickly production in the Libyan desert can be resumed. The company said it was producing about 100,000 barrels of oil per day in Libya before civil war erupted in 2011. During the first quarter of 2013, it reached a production level of 85,000 bpd. The German company said production at the offshore al-Jurf oil field wasn't affected by crises in Libya. Austrian energy company OMV said Wednesday its oil production in Libya has been interrupted for nearly a month.