TOKYO: Oil prices rose on Tuesday on escalating concerns about potential supply shortages, with Brent crude leading the way as hundreds of oil workers in Norway are set to strike later in the day after failed wage talks.
Brent crude had added 25 cents, or 0.3 per cent, to $78.32 per barrel by 0056 GMT, following a 1.2-per cent climb on Monday.
US light crude futures were up by 17 cents, or 0.2 per cent, at $74.02. They gained 5 cents to settle at $73.85 a barrel the session before.
Hundreds of workers on Norwegian oil and gas offshore rigs are due to on strike on Tuesday after rejecting a proposed wage deal, a move which will likely affect the production of at least one field, Shell's Knarr.
That potentially adds to disruptions in other oil producing regions amid tensions in the Middle East.
The United States says it wants to reduce oil exports from Iran, the world's fifth-biggest producer, to zero by November, which would oblige other big producers to pump more.
Saudi Arabia, fellow members of the Organization of the Petroleum Exporting Countries (Opec) and allies including Russia agreed last month to increase output to dampen price gains and offset global production losses in countries including Libya.
The market has grown concerned that if the Saudis offset the losses from Iran, that will use up global spare capacity and leave markets more vulnerable to further or unexpected production declines.
Libya's national oil production fell to 527,000 barrels per day from a high of 1.28 million bpd in February following recent oil port closures, the head of the National Oil Corporation said in a statement on Monday.
In Canada, an outage at the 360,000-barrel per day (bpd) Syncrude oil sands facility has reduced flows into Cushing, Oklahoma, the delivery point for US futures.
Money managers raised their bullish bets on US crude in the week to July 3, the US Commodity Trading Commission said on Monday.
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