Brent crude futures were up 12 cents at $53.94 a barrel by 0858 GMT, while US crude futures lost 3 cents to $45.56.b
Oil prices edged up on Monday after evidence that a recent fall to 15-month lows may be affecting output in the United States, the world`s largest producer, although concern about the outlook for demand tempered gains.
Brent crude futures were up 12 cents at $53.94 a barrel by 0858 GMT, while US crude futures lost 3 cents to $45.56.
Brent fell 11 per cent last week and hit its lowest since September 2017, while US futures slid to their lowest since July 2017, bringing the decline in the two contracts to 35 per cent so far this quarter.
The price drop has caused US shale oil producers to curtail drilling plans for next year.
The boom in shale output has made the United States the world's largest oil producer, overtaking Saudi Arabia and Russia.
Physical prices for Brent have also fallen in the last six weeks, driven by a drop in demand from Chinese refiners in particular, which has weighed on the value of barrels of anything from the North Sea to Nigerian crude.
"The recent weakness in the physical Brent structure can be attributed to a broader easing of purchases by Asian refiners at this point, with lower-end-Q1 intake weighing on spot assessments, and we can expect this pressure to carry through over the coming weeks," consultancy JBC Energy said in a report.
Still, the macroeconomic picture and its impact on oil demand continue to pressure prices. Global equities have fallen nearly 9.5 per cent so far in December, their biggest one-month slide since September 2011, when the eurozone debt crisis was unfolding.
The trade dispute between the United States and China and the prospect of a rapid rise in US interest rates have brought global stocks down from this year`s record highs and ignited concern that oil demand will be insufficient to soak up any excess supply.