Both main contracts tumbled more than four percent Wednesday after official US data showed a smaller than expected decline in crude stockpiles, adding to fears that a supply glut might not be easing as quickly as expected.
Commercial inventories fell 2.5 million barrels in the week ended July 8 but still remained at historically high levels while production, which had been steadily falling, increased.
Adding to the disappointment about the disappointing reading was the fact it came during the July 4 Independence Day holiday and at the height of the summer driving season.
At about 0400 GMT, US benchmark West Texas Intermediate was up 61 cents, or 1.36 per cent, at USD 45.36 while Brent crude rose 57 cents, or 1.23 per cent, to USD 46.83.
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"Every time we have seen these big pullbacks, there is quite a lot of strong buying around that USD 44, USD 45 level," Angus Nicholson, a markets analyst in Melbourne at IG Ltd, told Bloomberg News.
Prices have fluctuated between USD 44 and USD 52 a barrel over the past month after hitting near 13-year lows below USD 30 in February.