One surprise is the resilient oil demand in China despite its economic slowdown.

"Our preliminary August estimate posted a near double-digit percentage point gain in year-on-year terms despite the otherwise ailing macroeconomic backdrop," the Paris-based agency said.

Crude oil prices were relatively stable in September and rallied early this month on "expectations of a lower US output and rising tension in the Middle East," the IEA said.

But they dipped Tuesday following the IEA's latest forecasts,Brent North Sea crude for delivery in November shedding 13 cents to stand at $49.73 per barrel in afternoon London deals.

US benchmark West Texas Intermediate for delivery in November slid 26 cents to $46.84 per barrel compared with Monday's close.

 

- Rebalancing market, when? -

The IEA, which analyses energy markets for advanced oil-consuming nations, noted that oil prices at $50 per barrel was "a powerful driver in rebalancing the global oil market, but the big question is just when will equilibrium be restored."

Russia's military intervention in Syria has raised international political tensions and created uncertainty -- although for now the global oil supply glut is tempering market reaction.

"Some of this uncertainly may start to clear next year although, considering Iran, the market may be off balance for a while longer," the report said.

Crude output by the 12-nation OPEC cartel rose by 90,000 barrels a day to 31.72 million in September driven by Iraq, now the world's biggest source of additional supply.

Iraq's banner month to a record 4.3 million barrels per day was due to a recovery in northern exports from disruptions along the country's pipeline to Turkey.

"But severe budgetary strain and ongoing issues with security and infrastructure are likely to limit supply growth in the near-term for Iraq," the IEA added.

As for non-OPEC producers, supply growth is eroding with the sharpest slowdown in the United States. In September non-OPEC oil production is estimated to have dropped by 180,000 barrels per day to 58.3 million.

In 2016 lower oil prices and steep spending cuts are expected to reduce non-OPEC output by nearly 500,000 barrels per day, the report added.