(Bloomberg Gadfly) -- After three years of gloom, the number 100 is finally starting to resurface in the forecasts of market analysts.

A slump in new production outside the U.S. shale patch in 2019 could help to send Brent crude briefly back above $100 a barrel next year, according to London-based consultancy Energy Aspects. 

The International Energy Agency also has a 100 number in its latest outlook, published Friday. While it doesn't forecast prices and doesn't yet look as far ahead as 2019, it sees global demand exceeding 100 million barrels a day for the first time in the fourth quarter of this year.

Oil's slump is over -- hail the return of triple-digit crude! Well, maybe, briefly.

OPEC ministers and friends meeting in Doha today to assess their output deal would be wise not to get too carried away.

The IEA, as I noted last week, is much less bullish about demand growth in the coming months than other pundits. For some, this raises the risk that the world's most-watched forecast significantly underestimates oil use and, as a result, the speed of oil market rebalancing and the upward pressure on prices.

Broad-based economic recovery is setting the world up for demand growth of 1.7 million barrels a day in 2018, and there's a chance that it could be as high as 2 million barrels, according to Energy Aspects. Certainly there's a lot of expansion about -- the World Bank has raised its global GDP growth forecast for this year to 3.1 percent from the 2.9 percent it projected in June. With strong economic momentum in almost every country and region, there is "no real drag on oil demand growth," Energy Aspects said Jan. 15.

But there could be one in the works. Rising prices can have a chilling effect on demand growth, and benchmark crude prices have risen more than 55 percent since their rally started in June. End-user retail prices are feeling this.

U.S. gasoline and diesel are both the most expensive they have been at this time of year since 2014 and, in contrast to the normal seasonal pattern, pump prices are already rising. The same is true in Europe.

Strong demand growth in the developed countries of North America and Europe in the first half of 2017 was "largely attributable to lower prices," the IEA says. Drivers are unlikely to benefit from similar price moves this year.

What happens to car owners in rich nations isn't the only source of strain on demand. Many developing countries took the opportunity of the sharp fall in prices to reduce subsidies on oil products, which could amplify the impact of higher crude on what end users pay.

And some less-developed countries are shifting to natural gas from oil. The IEA sees 540,000 barrels a day of demand for gasoil, fuel oil and crude displaced by gas in five non-OECD countries since 2014. Saudi Arabia has also cut its direct crude use for power generation by around 100,000 barrels a day in the past two years. The displacement theme will continue this year.

The draw on global stockpiles should resume in the second quarter, even amid rising OPEC output, according to Energy Aspects.

The IEA also sees a big rise in oil production this year, including "explosive growth" in the U.S. With the pickup in non-OPEC supply exceeding the increase in demand, it sees the world's need for OPEC production falling by around 600,000 barrels a day compared with last year, to a level below last month's output. The implication of that for prices is clear -- if the IEA is right, the possibility that oil reaches $100 a barrel is remote.

Higher prices may yet clip the wings of the oil demand growth that OPEC and friends need. They should not let the sweet smell of the success they have had so far go to their heads in Doha.

--Bloomberg's Elaine He helped with charts.

This column does not necessarily reflect the opinion of Bloomberg LP and its owners.

Julian Lee is an oil strategist for Bloomberg. Previously he worked as a senior analyst at the Centre for Global Energy Studies.

To contact the author of this story: Julian Lee in London at [email protected].

To contact the editor responsible for this story: Jennifer Ryan at [email protected].

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