Between major disruptions to crude-oil supply and worries about an economic downturn that could crimp demand, this year has been incredibly volatile for oil markets. And 2012 looks set to be more of the same, with threats to both supply and demand to continue influencing oil prices
Between major disruptions to crude-oil supply and worries about an economic downturn that could crimp demand, this year has been incredibly volatile for oil markets.

And 2012 looks set to be more of the same, with threats to both supply and demand to continue influencing oil prices.

This year, the price of Brent crude swung between $92.37 and $127.02 a barrel amid the loss of high-quality Libyan crude and its subsequent faster-than-expected resumption, Middle East unrest, the U.S. credit-rating downgrade over the summer, and the ongoing euro-zone sovereign-debt crisis.

Overall, however, oil prices have proven remarkably resilient in the face of economic worries, with Brent crude trading over $100 a barrel for most of the year, while U.S. crude was mostly in the $90s. Overall, front-month Brent has risen 14% this year, to $107.72, while the front-month futures contract on the New York Mercantile Exchange has gained 8%, to $98.67.

In 2012, new geopolitical risks that will threaten supplies -- namely a proposed European Union oil embargo on Iran -- come on top of simmering unrest in key Middle East nations, supply losses from Syria and Yemen and a shortfall from Libya. Meanwhile, the euro-zone debt crisis lurches from one summit to the next, still unresolved, and hurting economic growth.

"There are lots of key risks for next year: downside is macro, upside is geopolitics," says Amrita Sen, oil market analyst at Barclays Capital. "That key tug of war over the latter half of this year will definitely continue, at least into the first half of next year."

Most analysts expect oil prices to be softer in the first quarter as the euro-zone crisis dominates the news and unseasonably warm winter weather keeps oil demand weak.

Prices could start to recover as early as the second quarter, analysts say, but more likely a rebound will come in the second half of the year.

This is expected to happen as oil demand in China, sluggish over the summer but picking up recently, expands and the as-yet-fragile economic recovery in the U.S. gathers pace amid an anticipated resolution to the euro-zone crisis.

One of the biggest risks to the upside is Iran, which could outweigh the bearish effects of concerns over weaker economic growth.

An EU embargo of Iranian crude would halt around 600,000 barrels a day of imports, hitting Europe's refiners hard and further tightening markets and inventories, putting upward pressure on oil-futures prices, the International Energy Agency has said.

Goldman Sachs Group, one of the most closely watched banks, is forecasting Brent crude to average $120 a barrel next year and Nymex crude to average $112.50. Barclays Capital forecasts Brent will average $115 a barrel in 2012 and Nymex crude $110 a barrel.