Libya's National Oil Corporation (NOC) has declared force majeure on crude loadings at Zawiya port.
The move follows reduced production at Sharara following the kidnapping of four employees of the joint venture which runs the oil field.
Field production is limited to 125,000 barrels per day – enough to meet the requirements of the Zawiya Refinery, but leaving no excess crude for export.
NOC chairman Mustafa Sanalla said: “Employee safety is always our first priority. This incident required us to shut down and evacuate a number of stations.
"We have to prioritise local demand for fuel. For the time being all Sharara production will go to the refinery.”
Four employees were seized by unknown armed assailants at station 186 on Saturday.
Two were later released, but the others remain captive.
The facility is run by Akakus, a joint between NOC, Total, Repsol, Statoil and OMV.
Expected losses to daily production are 160,000 barrels a day.
