French oil major Total will reduce production of its Angolan crude grade Dalia in April for planned maintenance, trade sources said on Thursday.
Dalia is under maintenance in the second half of April, said a trader.
The company was not immediately available for comment.
A provisional Angolan loading programme for April showed that there will be only four Dalia cargoes available for export compared with between seven and eight monthly for January-March.
The planned maintenance has pulled down the total number of exports to 1.54 million barrels per day from around 1.73 million bpd in March.
The Dalia field has a capacity of around 240,000 bpd and produces heavy, low-sulphur crude popular among Chinese buyers.
Angola is Africa's second largest crude oil exporter after Nigeria.