Brent crude oil steadied below $83 a barrel on Friday, consolidating after several months of sharp falls as the dollar hit a four-year high ahead of US jobs figures.

US non-farm payrolls data were due at 8:30 am EST (1330 GMT) on Friday and expected to show employment in the world's biggest oil consumer increased again in October.

The dollar reached its highest level since June 2010 against a basket of major currencies on Friday.

A stronger dollar raises costs for holders of other currencies and tends to dampen demand for dollar-denominated commodities such as oil.

Brent was unchanged at $82.86 a barrel by 1150 GMT. The benchmark hit a four-year intra-day low of $81.63 on Wednesday, down from a high above $115 in June.

US crude was up 20 cents at $78.11 a barrel, having dropped from a high above $107 five months ago.

"Non-farm payrolls could push the dollar even higher and add to the bearish picture for oil," said Carsten Fritsch, senior oil and commodities analyst at Commerzbank in Frankfurt.

Growing supplies of high quality crude oil from North American shale formations have weighed heavily on prices this year, creating a glut in world markets and decreasing demand for oil from the Organization of the Petroleum Exporting Countries (Opec).

Opec forecast on Thursday that its market share would be five per cent smaller by 2018 as shale supplies continued to increase faster than demand.

But Opec Secretary-General Abdullah Al-Badri said the 12-member cartel, which pumps a third of the world's oil, was not panicking and thought prices would recover next year.

"I think the price will rebound by the second half of next year. But I don't know by how much. This situation of low prices cannot continue," Badri said after announcing the publication the group's 2014 World Oil Outlook.

Opec ministers will meet in Vienna on November 27 to discuss how to react to falling oil prices and could decide to trim production.

But many analysts think the scale of the oil market glut is so great that Opec may not be able to reduce output sufficiently to prop up prices.

Oil analysts at French bank Societe Generale say a deal on a cut is possible but assign it less than a 50 per cent chance.

"We have a 30-40 per cent probability that there will be a cut (in output) of some kind," said Mark Keenan, head of commodities research at Societe Generale in Singapore.

Oil markets kept a close eye on talks between Iran and the big world powers over Tehran's nuclear programme, which Western countries fear is designed to produce an atomic bomb.

Negotiators have given themselves a deadline of November 24 to reach an agreement to curb the programme, which could bring an end to sanctions that have taken more than one million barrels per day of oil off world markets, weakening prices further.

Libya hopes to reopen the southern El Sharara oilfield "very soon" after it resolves a conflict between local tribes following an attack by gunmen that shut the field on Wednesday, an oil official said on Thursday. - Reuters