Nigeria stands to benefit as oil rose on Tuesday at the international market, supported by gains in equities and supply concerns in Norway and Libya.
Brent crude futures hit a session high of 79.51 dollars.
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United States crude futures rose to settle at high of 74.70 dollars.
All three major stock indexes were up, with the S&P 500 at a four-month high.
At 4:30 p.m., the API is scheduled to release its U.S. inventory data for last week.
Analysts expect inventories to have declined.
Last month, the United States said it wanted to reduce oil exports of fifth-biggest producer Iran to zero by November.
Still, Brent was buoyed by a strike by hundreds of workers on Norwegian offshore oil and gas rigs, leading to the shutdown of one Shell-operated oilfield.
Also bullish to prices was plummeting production in Libya, where output has halved in five months to 527,000 barrels per day.
On Monday, Suncor Energy said its 360,000-barrel-per-day Syncrude facility would resume some production in July, earlier than expected, following an outage last month that disrupted total output and sent U.S. prices higher.
Meanwhile, members of the Organisation of the Petroleum Exporting Countries, led by Saudi Arabia, have agreed to boost output.
Still, there is concern that doing so will use up global spare capacity and leave markets vulnerable to further or unexpected production declines. NAN.
