Ethylene for February was offered at 49.00 cents/lb, up from 45.50 cents/lb in the morning.
Meanwhile, bids for February rose to 46.50 cents/lb from 44.00 cents/lb. Ethylene traded at 44.25-46.00 cents/lb on Monday.
The fire at Enterprise was forcing some crackers to run at reduced rates because of constraints on ethane supply, a market participant said.
The fire erupted at about 12:30 hours Houston time following explosions at the facility, which were still continuing on Tuesday afternoon, local news reports said.
An official with the Mont Belvieu Police Department said that no orders for evacuation or shelter-in-place had been issued, adding that the department was unaware of any injuries.
However, market sources said one contractor was still unaccounted for as of 13:30 hours Houston time (19:30 GMT).
Enterprise Products confirmed that report, according to Houston CBS television affiliate KHOU. The station also said witnesses reported seeing workers fleeing from the plant.
Meanwhile, other workers were being told to stay inside, KHOU reported.
Enterprise Products did not respond to requests for further comment about the status of the complex, which is the largest underground storage facility for NGLs in the world.
Market sources said the explosions and subsequent fire occurred in an iso-octane unit on the west side of the complex, near several storage facilities. Those also are near a liquefied petroleum gas (LPG) pipeline.
The storage facilities, which Enterprise acquired in 2001, consist of 30 salt-dome caverns with a total capacity of 77m bbl, according to the company’s website.
The facilities provide storage services for mixed natural gas liquids, ethane, propane, butanes, natural gasoline and olefins, Enterprise said.
Market sources speculated that the fire could persist for some time since it originated near the storage facilities.
Enterprise operates an NGL fractionation plant in Mont Belvieu. Overall, the NGL fractionation plant has a total capacity of 305,000 bbl/day, the company said on its website.
It fractionates mixed NGLs from several supply basins in North America, including the Mid-Continent, Permian Basin, San Juan Basin, Rocky Mountains, east Texas and the Gulf coast.
Market sources said NGL prices were offered higher following the fire, but few trades were likely to be completed until more information is released.
Mont Belvieu is located about 30 miles (48 km) east of Houston.
