Crude oil storage tanks are seen at the Kinder Morgan terminal in Sherwood Park, near Edmonton, Alberta, Canada November 14, 2016. Picture taken November 14, 2016.
Crude oil storage tanks are seen at the Kinder Morgan terminal in Sherwood Park, near Edmonton, Alberta, Canada November 14, 2016. Picture taken November 14, 2016. Reuters / Chris Helgren

Oil prices fell slightly in early Asian trade on Wednesday, pressured by global central bank efforts to tame inflation and ahead of expected builds in U.S. crude inventories as product demand weakens.

Brent crude prices fell 39 cents or 0.5% to $106.96 a barrel by 0045 GMT, while U.S. West Texas Intermediate (WTI) crude fell 62 cents to $103.60 per barrel.

U.S. crude stocks rose by about 1.9 million barrels for the week ended July 15, according to market sources citing American Petroleum Institute figures on Tuesday.

Official weekly crude and fuel inventory data from the U.S. Energy Information Administration (EIA) is expected on Wednesday at 1530 GMT. [EIA/S]

The U.S. 3:2:1 and gasoline crack spreads - measures of refining profit margins - both fell to their lowest since April on Tuesday, indicating weaker fuel demand.

Oil prices whipsawed in the previous session, caught in a tug-of-war between supply fears due to Western sanctions on Russia and pressures on indications from central bankers that they will raise interest rates to combat inflation.

On Friday, open interest in New York Mercantile Exchange futures fell to their lowest since September 2015 as investors cut risky assets like commodities, worried that the Federal Reserve will keep raising U.S. interest rates.