By Summer Said 

Oil production in Iraqi Kurdistan remains unaffected despite advances by Islamic State militants nearby that have led some energy companies to halt operations in the semiautonomous region, its Ministry of Natural Resources said Saturday.

Oil companies have begun evacuating staff and suspending operations at some fields in Kurdistan, northern Iraq, after the U.S. launched airstrikes intended to halt the advance of the Sunni extremists toward the region's capital, Erbil.

"The enemy has not been able to target oil operations. Oil production in the region remains unaffected and is being delivered to both the domestic and export markets," the ministry said. "The Kurdistan Regional Government is expecting that the producing companies will ramp up production in the coming weeks as ongoing export infrastructure improvements come online as planned."

The security situation in the area bordering Iraqi Kurdistan has deteriorated since the militant group calling itself Islamic State--formerly known as the Islamic State of Iraq and al-Sham, or ISIS--pushed into territory held by the Peshmerga, the region's security force, raising serious concerns about areas previously considered safe.

London-based Afren PLC and Canada-listed Oryx Petroleum both said Friday they had suspended parts of their operations in the country. Anglo-Turkish company Genel Energy PLC said it was withdrawing some nonessential personnel, following a similar announcement by U.S. oil major Chevron Corp. on Thursday.

Earlier Saturday, Abu Dhabi National Energy Co., or Taqa, said it has suspended its operations and significantly reduced staffing levels at the Atrush Block in Kurdistan due to escalating instability in the region.

Kurdistan described the firms' moves as "precautionary measures," but warned the companies not to take any steps without close coordination with the Ministry of Natural Resources.

Write to Summer Said at summer.said@wsj.com

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