By Alex Lawler

In a sign supply is plentiful, industry group the American Petroleum Institute said on Tuesday U.S. crude stocks had risen by 9.9 million barrels - more than forecast. The U.S. government's supply report is due at 1430 GMT.

Brent crude, the global benchmark, was down 80 cents to $75.64 a barrel at 0930 GMT. It fell earlier to $75.11, the lowest since Aug. 24. U.S. crude dropped 17 cents to $66.26.

"Rising oil inventories and growing petro-nations' output calm the supply fears related to the Iran oil embargo," said Norbert Ruecker, head of macro and commodity research at Swiss bank Julius Baer.

Crude fell sharply in the previous session, with Brent closing down 4.3 percent.

"This price movement comes as little surprise with attention now clearly being focused on the weakening economic situation and gloomy demand outlook," said analysts at JBC Energy in a report.

A sell-off in equities due to concern about the economic outlook also weighed on crude on Tuesday. Forecasters such as the International Energy Agency already expect slower oil-demand growth for 2019 due to a slowing economy.

On Wednesday, Asian stocks edged up as signs of stimulus from China propped up sentiment and European shares attempted a tentative rebound.

While U.S. sanctions on Iran which start on Nov. 4 are expected to tighten supplies, other producers, notably top exporter Saudi Arabia, are already pumping more oil and willing to increase further if needed.

Saudi Energy Minister Khalid al-Falih said on Tuesday that Saudi Arabia would step up to "meet any demand that materialises to ensure customers are satisfied".

Some analysts say nonetheless that prices could rebound before the end of the year.

"We still see Brent reaching $85 per barrel by year-end," said U.S. bank Morgan Stanley.

Next year, slower demand and additional U.S. shale oil production should contribute to lower prices, Ruecker of Julius Baer added.

"While in the near term prices are at risk from any further supply disruption, oil should trend lower heading into 2019 as slowing emerging market demand growth and the shale boom restore the oil market's supply cushion," he said.

(Additional reporting by Henning Gloystein; Editing by Mark Potter)

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