DONG Energy A/S said it has shut its Siri field in Denmark after discovering cracks in part of the platform.

The company said the cracks were found during routine maintenance in a structure affixed to the 50,000 cubic-meter subsea oil storage tank on the platform. It has halted output while the causes are studied.

Siri is located on the Danish continental shelf close to the Norwegian border. Two other fields, Nini and Cecilie, are tied back to Siri, and the area produces around 25,000 barrels a day, according to data on DONG's Web site.

DONG is the operator of the field, with a 50% stake, and Norway's Noreco (NORECO.OS) also owns a 20% stake. Noreco said in a statement: "Further investigation and analysis over the next couple of days will provide more information and timing for restart of the Siri production."

Talisman (TLM) holds the remaining 30% stake in the field.

DONG was unable to immediately comment on the expected timing of restart.

Company Web site: www.dongenergy.com

-By Elizabeth Adams, Dow Jones Newswires; +44 (0) 20 7842 9386; elizabeth.adams@dowjones.com