Front month US crude futures jumped a dollar, or 2.8%, to $36.89 per barrel early on Wednesday. International Brent futures rose 1.8% at $38.55 a barrel.

"Oil gained some momentum. The comment by the Kuwait Opec governor provided some support to prices," ANZ bank said, but warned that investors would likely remain cautious ahead of the 17 April meeting.

An initial output freeze agreed in February has helped oil prices rise to almost $38 a barrel from a 12-year low close to $27 plumbed earlier this year.

However, prices have fallen in recent days on doubts that a wider deal will be reached, largely because Iran has so far said it has no intention of slowing its production after crippling sanctions against it were lifted in January.

Iranian Oil Minister Bijan Namdar Zanganeh said the country's crude output would reach 4 million barrels per day by March 2017, state television reported on Wednesday, with plans to export 2.25 million bpd of those supplies.

That would be up from a little over 1 million bpd under the sanctions and only slightly below pre-sanctions peaks of 2.5 million bpd.

With Iran's exports rising and other producers pledging to freeze production near record-high levels, an agreement would do little to address a global supply overhang that sees at least a million barrels of crude produced every day in excess of demand.

Dutch bank ING said that technical market indicators implied that oil prices had developed a bottom near recent lows but that the "short-term upside is limited".

In physical markets, sentiment was also less bullish, with Abu Dhabi cutting its March retroactive official selling price (OSP) crude premium MUR-OSP over benchmark Dubai prices by 64 cents to $3.06 per barrel on ample supplies.

This followed top exporter Saudi Arabia cutting its May Arab Light crude OSP by 10 cents per barrel to a discount of $0.85 per barrel to the Dubai average.