Statoil ASA (NYSE: STO) will initially keep oil fields operating even if negotiations set for June 30 to July 1 fail to avert a strike that would halt output at others, the Norwegian Oil and Gas Association (NOG) said on June 29.

Workers at five fields operated by ExxonMobil Corp. (NYSE: XOM) Engie and BASF unit Wintershall could walk off the job from July 2 if wage talks fail.

That would cut Norway's output of oil, natural gas and NGL by about 7%, data from the Norwegian Petroleum Directorate shows.

Trade unions said on June 27 that 755 workers could walk out, potentially affecting work on seven fields that account for about 17% of Norway's crude oil and natural gas output.

NOG on June 29 said eight fields in total would be affected, but output would only be affected at five of them. It cautioned that the three Statoil fields could be forced to also halt output if any strike that occurs is expanded.

A final round of mandatory talks will be hosted by a state mediator on June 30 and July 1.