Fall in US inventories gives some support to prices which continue to be weighed down by oversupply worries.

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REUTERS

Oil prices nudged higher on Thursday on strong demand in the US, but analysts cautioned that oversupply would continue to drag on markets.

Brent crude futures had risen 18 cents, or 0.4%, to $47.97 per barrel early on Thursday.

US West Texas Intermediate crude futures were up 19 cents, or 0.4%, at $45.32 per barrel.

Traders said the gains reflected firm fuel demand in the US, where data from the American Petroleum Institute (API) late on Wednesday showed that US crude inventories fell by 5.8 million barrels in the week to June 30 to 503.7 million.

However, overall market conditions remain weak.

Prices tumbled about 4% on Wednesday on rising exports by the Organization of the Petroleum Exporting Countries (Opec), despite its pledge to hold back production between January this year and March 2018 to prop up prices.

"Against expectations, OECD total oil inventories are still above 3 billion barrels and the recovery in Libyan and Nigerian supplies, coupled with a fast return of US shale, should prevent steep stock draws ahead," Bank of America Merrill Lynch (BAML) said, adding that output was set to rise further.

BAML said it was cutting its WTI forecasts to an average $47 per barrel this year and $50 in 2018, down from $52 and $53 previously.

The bank cut its average Brent forecasts to $50 this year and $52 per barrel in 2018, down from $54 and $56 before.

Opec exported 25.92 million barrels per day in June, 450,000 bpd above May and 1.9 million bpd more than a year earlier, according to Thomson Reuters Oil Research.

Researchers at brokerage Sanford C. Bernstein reduced its average Brent crude price forecasts for 2017 and 2018 to $50 per barrel each, down from $60 and $70 previously.

Bernstein said that the reduction was a result of an expected increase in US shale oil output, especially from the Permian field.

Bernstein also said that non-shale supply additions outside Opec would likely exceed or match production declines of mature fields.

Denmark's Saxo Bank said that oil prices could rise towards $55 per barrel in the coming months, but said it expected lower prices towards the end of the year and into 2018.

"Brent crude oil is likely to rally back towards $55 per barrel during the coming months before renewed weakness sets in as the focus turns to 2018 and the potential risk of additional barrels hitting the market if Opec and Russia fail to extend the production cut deal beyond Q1 2018," said Ole Hansen, Saxo Bank's head of commodity strategy.