OSLO, Feb 6 (Reuters) - Norwegian oil firm Det norske will book an impairment in the fourth quarter from its 2014 acquisition of Marathon Oil's Norwegian business, it said on Friday.
The non-cash net impairment charge will be between $320 million and $340 million in the fourth quarter, it said in a statement.
The company also said it will start reporting its earnings in U.S. dollars, switching from Norwegian crowns.
The balance sheet has been converted to dollars at a rate of 6.6161 as of Oct. 15 last year, which was the closing date for the acquisition of Marathon Oil's business.
The Oslo-listed firm said it has recognised regular goodwill of around $300 million and technical goodwill of around $1.2 billion as per the accounting requirements for financial reporting purposes under IFRS 3. (Reporting by Stine Jacobsen, editing by Terje Solsvik)