Traders were keeping a close watch on the movement of Hurricane Ike, which bore down on Cuba as it made its way to the Gulf of Mexico. Nearly 80 percent of U.S. oil production and 70 percent of natural gas production in the Gulf remained halted Sunday following evacuations in preparation for Hurricane Gustav, according to the U.S. Minerals Management Service. 'It is still too early to celebrate the passing of Gustav, as Hurricane Ike could reach the Gulf of Mexico by the end of this week,' analysts at Vienna-based JBC Energy said in a note to investors. Ike's advance left rig operators questioning whether to resume production. Early Monday, the storm was a Category 3 hurricane with sustained winds near 120 mph (193 kph), about 30 miles (48.3 kilometers) east of Punto de Sama on eastern Cuba's coast and moving west at 14 mph (22.5 kph). It was forecast to track over Cuba, re-emerging over the island's western coast Tuesday morning about 100 miles south of Key West as a Category 1. Royal Dutch Shell said it would keep staff at its offshore Gulf installations, which it reduced ahead of Gustav last week, to a minimum as it monitors Ike. 'Companies are caught between restarting production after Gustav and making preparations for Ike,' said David Moore, a commodity strategist at Commonwealth Bank of Australia in Sydney. 'These storms are very unpredictable, but Ike's likely movement puts it into the Gulf area.' Investors are also waiting to see what action the Organization of Petroleum Exporting Countries might take at its next meeting Tuesday. Some members have indicated the cartel may act to defend the $100 a barrel level. Iran's oil minister, Gholam Hossein Nozari, said Monday there is too much crude on the market, adding that OPEC is reviewing whether supply exceeds demand before deciding whether to cut back production. The country, OPEC's second-biggest oil producer, has been the most vocal in saying the group should stem global supply. Crude has plunged about $38, or 26 percent, since surging to a record $147.27 a barrel on July 11. In other Nymex trading, heating oil futures rose 3.19 cents to $3.0147 a gallon, while gasoline futures jumped 6.64 cents to $2.7525 a gallon. Natural gas for October delivery gained 17.2 cents to $7.621 per 1,000 cubic feet. In London, October Brent crude rose 84 cents to $105 a barrel on the ICE Futures exchange.