UPDATE 1-Libya's oil company protests to OPEC about Qatar
* Libya's NOC protests to OPEC about Qatar's help for rebels
* Qatar is marketing Libyan crude on behalf of rebels
* OPEC has track record of working together despite disputes
(Adds details, OPEC no comment)
LONDON, April 18 (Reuters) - Libya's National Oil Corporation has protested to OPEC about help fellow member Qatar is giving to Libyan rebels, sources familiar with the matter said on Monday.
The complaint by Shokri Ghanem, the chairman of NOC, hints at rising political tension as a result of the Libyan crisis within the Organization of the Petroleum Exporting Countries, which pumps more than a third of the world's oil.
His letter to OPEC described the Qatari action as "very unfortunate," said one of the sources, who declined to be identified because the source is not authorised to speak to journalists.
Brent crude futures LCOc1 earlier this month rose above $127 a barrel, the highest in more than two and a half years, partly as a result of the conflict in Libya and resulting loss of most of its crude oil exports. Continued...