Some OPEC members want oil prices to rise to $100 a barrel to offset the decline in the dollar.
The value of the dollar, which has slipped 13% since June against major world currencies, means that the "real price" of oil is about $20 less than current levels, Venezuela's Energy and Oil Minister Rafael Ramirez said after Thursday's OPEC meeting in Vienna
OPEC, which accounts for 40% of global crude output, left targets unchanged and called for stronger adherence to production quotas, Bloomberg News said.
"They're concerned about the dollar because as the dollar weakens, prices go up," Nordine Ait-Laoussine, former oil minister for Algeria, told Bloomberg News.
OPEC countries are exceeding their quotas as prices creep above the $70-$80 a barrel band that Saudi Oil Minister Ali al-Naimi called "ideal."
"We would love to see $100 a barrel," Shokri Ghanem, chairman of Libya's National Oil Corp. said. "We're losing real income. Libya in particular would like to see a higher oil price."
Other countries are less certain: Kuwait's oil minister said he'd prefer a price no greater than $85 a barrel; while the Algerian minister said a price between $90 and $100 a barrel was "reasonable."