Oil jack pumps in the Kern River oil field in Bakersfield, California.

Oil prices edged higher on Thursday, but swelling U.S. crude stockpiles limited the rebound from a one-week low after the International Energy Agency said oil markets had been tightening even before cuts agreed by OPEC and other producers took effect.

The IEA said that while it was "far too soon" to gauge OPEC members' compliance with promised cuts, commercial oil inventories in the developed world fell for a fourth consecutive month in November, with another decline projected for December.