CAPE TOWN, May 20 (Reuters) -

Seventeen people were injured, four seriously, when a fire

broke out in the early hours of Tuesday at Chevron's ( CVX )

deep-water Benguela Belize Lobito Tomboco (BBLT) oil platform,

Angolan authorities and the U.S. oil major said in statements.

The cause of the fire, which occurred in the basement

deck of the multi-storey drilling production platform in the

Block 14 concession some 60 miles (97 km) offshore the Cabinda

coast, is currently under investigation.

"All of them are now on land and receiving appropriate

medical care," Angola's National Agency for Petroleum, Gas and

Biofuels said in its statement, referring to those injured.

Chevron ( CVX ) said the incident occurred at a time when BBLT

was undergoing annual maintenance as part of a scheduled

shutdown, all production at the site having stopped on May 1

this year.

The heavy platform has living quarters for approximately

157 people, according to Chevron's ( CVX ) website. The fire broke out

around 3 a.m. (0200 GMT) and all personnel have been accounted

for, Chevron ( CVX ) said.