By Ayenat Mersie
NEW YORK (Reuters) - Oil prices rose on Tuesday on growing supply disruptions in Norway and Libya, but gains were pared after the United States said it would consider requests for waivers from Iranian oil sanctions.
Brent crude futures rose by 64 cents to $78.71 per barrel by 11:38 a.m. EDT (1538 GMT). Earlier, the global benchmark hit a session high of $79.51.
U.S. crude futures were up 13 cents at $73.98, after hitting a high of $74.70.
Earlier in the session, prices had been within striking distance of the four-year highs, said Bob Yawger, director of energy futures at Mizuho.
They retreated, however, following a statement by U.S. Secretary of State Mike Pompeo that the United States would consider requests from some countries to be exempted from sanctions on Iranian oil that it will put in effect in November
"But it isn't unlike anything that they've said before. But it all depends on which countries they're talking about. Is it big buyers of Iranian crude? Is it India?...Is it temporary waivers?"
Still, supply concerns elsewhere were pushing Brent prices higher.
Hundreds of workers on Norwegian offshore oil and gas rigs went on strike on Tuesday after rejecting a proposed wage deal, leading to the shutdown of one Shell-operated oilfield. [nL8N1U56BO]
The disruption had sent U.S. prices higher. The updated restart has muted U.S. crude's gains and helped widen the difference between the two benchmarks, said Yawger.
Meanwhile, Saudi Arabia, fellow members of the Organization of the Petroleum Exporting Countries and allies including Russia agreed last month to increase output to dampen price gains and offset global production losses.
But the market has grown concerned that if Saudi Arabia offsets Iranian losses, it will use up global spare capacity and leave markets vulnerable to further or unexpected production declines.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)