UPDATE 2-Libya's oil output down 252,000 bpd, NOC declares Sharara force majeure

majeure@ (Adds Sharara force majeure)

LONDON, March 28 (Reuters) - Oil production at the western Libyan fields of Sharara and Wafa has been blocked by armed factions, reducing output by 252,000 barrels per day (bpd), a source at the National Oil Corporation (NOC) said on Tuesday.

NOC on Tuesday declared force majeure on loadings of Sharara crude from the Zawiya oil terminal in the west of the country.

The shutdown at Sharara, which had been producing about 220,000 bpd, began on Monday, and the shutdown at Wafa a day earlier, the source said.

Sharara resumed operations in December after a shutdown that began in November 2014 due to local protesters blocking a pipeline connecting it to the Zawiya oil terminal.

Austrian oil firm OMV, one of the foreign partners in the field, was due to load a 600,000 barrel cargo of Sharara crude from Zawiya on board the Sea Vine tanker later this week.

The booking for the tanker has been cancelled, a Libyan port source with knowledge of the shipment told Reuters.

OMV did not immediately respond to a request for comment.

The oilfield is operated by a joint venture between NOC and a consortium of Repsol, Total, Statoil and OMV.

(Reporting by Julia Payne in Lausanne, Ahmad Ghaddar in London and Olga Yagova in Moscow; Writing by Ahmad Ghaddar; Editing by Mark Potter and David Evans)