Voice of America reported Libya's production has been cut in half by the walkouts.
In the latest development, resuming strikes curtailed operations at two major oil-handling ports, Es Sider and Ras Lanuf, after a brief hiatus, VOA said.
The ports have a daily capacity of handling 600,000 barrels per day.
On the New York Mercantile Exchange, West Texas Intermediate crude added 42 cents to $106.53 per barrel. Reformulated blendstock gasoline gained 4.28 cents to reach $2.9469 per gallon. Home heating oil added 2.1 cents to reach $3.0419 per gallon.
Natural gas added 0.6 cents to $3.316 per million British thermal units.
At the pump, the national average price for a gallon of unleaded regular gasoline was $3.542, down from Monday's $3.549, the AAA Fuel Gauge report said.