The price of oil fell Thursday as producers assessed the impact of Hurricane Isaac and traders waited to see if the Federal Reserve would act to boost the economy.
US benchmark oil fell 87 cents to finish trading at US$94.62 a barrel in New York. Brent crude rose 11 cents to end at US$112.65 a barrel in London.
Oil companies evacuated many Gulf of Mexico platforms and refineries in advance of Isaac, which blew through as a hurricane before being downgraded to a tropical storm. They were assessing damage on Thursday.
Some 95 per cent of the daily oil production in the Gulf of Mexico has been shut down, according to the Bureau of Safety and Environmental Enforcement.
The federal agency said workers have been evacuated from 509 production platforms, or 85 per cent of manned platforms in the Gulf of Mexico. Workers have also been pulled from 50 drilling rigs, or 66 per cent of the total, the agency said.
Energy consultant Jim Ritterbusch said traders are good at accounting for the risk of tropical storms and hurricanes, which are a regular fact of life in the Gulf of Mexico.
The bigger issue for the price of oil, he said, was the potential for news from the Federal Reserve on Friday. Investors will be listening to Fed Chairman Ben Bernanke's speech for hints of additional steps to spur borrowing and spending. Some economists doubt he will say anything dramatic.
Ritterbusch noted that stocks were down on Thursday, too.
"Financial markets are nervous," he said, adding that oil was being affected.
Meanwhile, the average price of gasolene rose more than two cents on Thursday to US$3.826 per gallon (about US$1 litre).
Isaac has forced several refineries along the Gulf Coast to close, and others are operating at reduced rates.
In other energy futures trading:
Heating oil rose less than a penny to finish at US$3.1245 per gallon.
Wholesale gasolene fell 1.77 cents to end at US$3.0826 per gallon.
Natural gas rose 6.3 cents, or 2.3 per cent, to finish at US$2.7480 per 1,000 cubic feet.
The government has estimated that nearly 72 per cent of Gulf natural gas production has been suspended due to Isaac.
Prices rose even though more natural gas than expected was put into storage last week, according to the Energy Information Administration.
It said 66 billion cubic feet of natural gas went into storage, more than the 58 billion to 62 billion cubic feet expected in a survey of analysts by Platts, the energy information arm of McGraw-Hill Cos.