A general view of the Zueitina oil terminal is seen in Zueitina, west of Benghazi April 7, 2014. Libya's Zueitina oil port prepared on Monday to load crude on tankers after the government reached a deal with rebels to reopen four terminals that insurgents have occupied since summer. The federalist rebels agreed on Sunday to end gradually their eight-month blockade of Zueitina, Hariga, Ras Lanuf and Es Sider ports, which account for around 700,000 barrels per day of the OPEC country's crude exports. REUTERS/Esam Omran Al-Fetori (LIBYA - Tags: POLITICS ENERGY BUSINESS) - RTR3KAL4

Libya is currently losing more than 550,000 barrels per day in oil production from blockades on major fields and export terminals, the National Oil Corporation media office said on Wednesday.

The blockades by groups in southern and eastern Libya citing political demands have caused NOC to declare force majeure on output from several major fields and ports in recent days. The first field went offline on Sunday with others following on Monday and Tuesday.