Front month U.S. West Texas Intermediate (WTI) crude futures were trading at $38.02 per barrel at 0653 GMT, up 76 cents, or 2 percent, from their last close. International Brent futures were up 60 cents at $40.03 a barrel.

Prices, which have swung between highs of about $42 a barrel and lows of about $27 this year, will continue to be volatile in the short term, Al Jaber said in an interview with Abu Dhabi dailies The National and Al Ittihad.

OPEC secondary sources put Iran's current output at 2.93 million barrels per day (bpd). It is working to regain market share, particularly in Europe, after the lifting of international sanctions in January. The sanctions had cut crude exports from a peak of 2.5 million bpd before 2011 to just over 1 million bpd in recent years.

The world’s biggest oil exporter lost ground to rivals in nine out of 15 top markets between 2013 and 2015, including China, South Africa and the US, according to an analysis of customs data.

Brent oil prices dropped below $40/bbl on the London market on Mar. 29 after news reports about the restart of production from Khafji oil field, which had been closed since October 2014. Kuwait Gulf Oil Co. and Saudi Aramco Gulf Operations Co. jointly operate the 300,000-b/d field. No restart date was given.

Persistently low oil prices complicate the conduct of monetary policy, risking further inroads by unanchored inflation expectations. What is more, the current episode of historically low oil prices could ignite a variety of dislocations including corporate and sovereign defaults, dislocations that can feed back into already jittery financial markets. The possibility of such negative feedback loops makes demand support by the global community—along with a range of country-specific structural and financial-sector reforms—all the more urgent.

Europe and Russia are each trying to diversify—the first by getting more gas suppliers, and the second by trying to sell more gas to China and East Asia.

Neil Atkinson, head of the IEA’s Oil Industry and Markets Division, said in Singapore on Wednesday. About $300 billion is needed to sustain the current level of production, and nations including the U.S., Canada, Brazil, and Mexico are facing difficulty in keeping up investments, he said.

“We furnish 20 percent of China’s crude oil imports – about one million barrels a day. But there’s a significant gap in what we are doing now, and what we can offer,” Nasser said. “Our investments in China’s entire oil value chain – integrating supply, refining, chemicals, lubes, distribution and marketing – don’t match our supply.”

The average price of a gallon of gasoline in the United States gained nearly 25 cents in the past four weeks, according to a survey released on Sunday.

Analysts estimate that between 15 and 20 percent of 2016 U.S. oil production is hedged, and as little as 2 percent for 2017.

Brent crude, the global oil benchmark, rose 2.2% to $41.23 a barrel on London’s ICE Futures exchange. On the New York Mercantile Exchange, West Texas Intermediate futures were trading up 2.7% at $39.50 a barrel.

Oil prices have rallied by almost 50 per cent since dropping below $30 a barrel in January, tempting producers to grab any price that will allow them to keep operating through the worst commodity crash in more than 20 years.

Net Benefits of Prolonged Drop in Oil Prices Diminish or Turn Negative for Some Sectors.

Brent crude oil prices are forecast to average $34/b in 2016 and $40/b in 2017, $3/b and $10/b lower than forecast in last month's STEO, respectively. The lower forecast prices reflect oil production that has been more resilient than expected in a low-price environment and lower expectations for forecast oil demand growth.