Global oil prices rose Tuesday but gains were limited as dealers sat on the sidelines eyeing negotiations aimed at ending a strike at some US crude refineries, analysts said.
European benchmark Brent North Sea crude for April delivery won $1.22 to $60.76 a barrel in London midday deals.
New York's West Texas Intermediate (WTI) for April added 71 cents to $50.30 a barrel.
Talks to settle a strike by workers at three major US refineries operated by Royal Dutch Shell are set to restart Wednesday following a stalemate on February 20.
More than 5,000 workers spread across around a dozen installations have been on strike since February 1 demanding improved wages and safety conditions.
Daniel Ang, investment analyst at Phillip Futures in Singapore, said oil prices are "trading range-bound" ahead of the talks.
With storage space for unprocessed crude "reaching full capacity" at the key Cushing, Oklahoma, oil storage hub, oil majors could be compelled to reach a speedy conclusion to the dispute, Ang said.
The strike affects facilities accounting for about 13 percent of the processing capacity in the world's top crude consumer, according to Bloomberg News.
Nicholas Teo, market analyst at CMC Markets in Singapore, said dealers were also monitoring fresh marathon talks in Switzerland between the United States and crude producer Iran over Tehran's controversial nuclear programme.
The Islamic republic has been crippled by a series of UN and US sanctions, including on crude exports, aimed at bringing an end to its nuclear drive, which the West claims is being used to develop atomic weapons. Iran denies the claims.
The pace and intensity of the negotiations to hammer out a deal to rein in the nuclear programme in exchange for sanctions relief have gathered pace as a March 31 deadline for a political accord nears.
Markets are eyeing the possibility that "Iran may be able to bring back its supply into the global pot", Teo said.