OSLO--Norway's Auditor General warned Wednesday that some of the country's oil resources may be lost forever, saying the government should add pressure on oil companies to develop time-critical projects.

The Auditor General, which oversees the government's use of public resources, warned that some oil might remain underground because it is in aging fields with old equipment that would be too expensive to replace. Some of Norway's projects to squeeze the last drops out of offshore fields have been delayed after the oil-price plunge in the second half of 2014 to around $60 per barrel, meaning the equipment could continue to age past its useful life.

"The Petroleum Directorate is actively promoting the good use of resources, but isn't always able to ensure good enough progress in field development through dialog with the licensees," Auditor General Per-Kristian Foss said, recommending tighter monitoring of oil companies.

Current plans of oil companies imply more than 50% of Norway's oil and gas resources will be left in the ground, the auditor general said. Based on an oil price of $57.9 per barrel, an increase in the recovery rate in existing fields by one percentage point would create roughly 260 billion Norwegian kroner ($32.87 billion), he said.

State-controlled Statoil, the dominant operator off Norway, recently delayed both the Johan Castberg project in the Barents Sea and a project to boost output on the aging Snorre field in a bid to cut costs. The Snorre project could add up to 300 million barrels to the field's current resources, and is widely seen as time-critical.

Norway's auditor general questioned whether the country's authorities were properly set up to take care of state interests, amid growing oil-sector complexity. The number of drilling licenses off Norway has increased 67% since 2006, and the number of oil companies has grown to 38 from 29, it said.

State-owned Petoro AS, which manages the government's direct ownership in over 40 fields off Norway, has more than doubled the number of licenses since 2003. However, staff numbers have grown only by about 20% since 2007, and the company has limited capacity to challenge the operators' views, the auditor general said.

The country's Ministry of Petroleum and Energy responded that there may be good reasons for companies to delay projects, including risk and the need to boost project economics. The ministry warned that adding pressure on the oil companies could reduce their trust in the authorities and turn them away from marginal projects off Norway.

Write to Kjetil Malkenes Hovland at kjetilmalkenes.hovland@wsj.com

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