"We must say that today's oil market conditions do not suggest that prices can recover sharply in the immediate future - unless, of course, there is a major geopolitical event," the International Energy Agency said in its medium-term report, which looks five years ahead.
"Only in 2017 will we finally see oil supply and demand aligned but the enormous stocks being accumulated will act as a dampener on the pace of recovery in oil prices when the market, having balanced, then starts to draw down those stocks," it said.
The IEA acknowledged that predicting the oil market "is today a task of enormous complexity", saying experts were still grappling with the implications of a dramatic drop in the oil price from over USD 100 per barrel in July 2014 to around USD 30 today.
A year ago, analysts predicted that oil oversupply would end by late 2015, "but that view has proved very wide of the mark", it admitted.
Demand for oil, meanwhile, will continue to increase, but at a weaker pace amid financial market turmoil and clear signs that "almost any economy you care to look at could see its GDP growth prospects downgraded".