HOUSTON—An oil production platform that suffered a large fire in the Gulf of Mexico is covered by Oil Insurance Ltd., according to the energy industry mutual insurer's website.

The Vermilion oil rig 380, owned by Houston-based Mariner Energy Inc., became engulfed in flames Thursday morning about 100 miles off the coast of Louisiana.

The fire forced 13 workers into the ocean, but officials said at most one worker was injured.

Mariner is a member of the Hamilton, Bermuda-based energy industry mutual OIL. The mutual covers its members for property damage, pollution control, well control and other risks.

The specific limits and deductibles Mariner purchased were not known.

The company at times buys windstorm coverage from the commercial market to supplement its windstorm coverage from OIL. However, Mariner in 2009 opted not to buy any additional windstorm insurance from the commercial market, according to a filing with the Securities and Exchange Commission.