Statoil ASA lowered the resource estimate for the Johan Sverdrup oil discovery and delayed the start of production by about a year in a setback for the biggest find off Norway in decades.

Resources at the field are now seen at 1.8 Bboe to 2.9 Bboe, Statoil said. That compares with a previous range of 1.8 Bboe to 3.6 Bboe, based on estimates provided by Statoil and Lundin Petroleum AB. The start of production was pushed back a year to the end of 2019.

“We would paint this as a ’blemish’ on the Utsira High,” the area of the North Sea where Sverdrup was discovered, Alex Gheorghe, an analyst at RS Platou Markets AS, said in an email. It’s “very disappointing to see both Statoil and the Norwegian Petroleum Directorate/government lose control of the situation, given the strong economics of the project and impact on Norway.”

Discovered in two parts by Lundin in 2010 and Statoil in 2011, Sverdrup renewed optimism in Norway’s oil industry after a decade of falling production from aging North Sea fields. The oil discovery, which may be Norway’s biggest since Statfjord in 1974 and the third-largest ever, could supply as much as 40% of the nation’s crude output production by the middle of the next decade, industry consultant Wood Mackenzie Ltd. said.

‘Tactical Game’

Det Norske Oljeselskap ASA, a stakeholder at Sverdrup, dropped as much as 17% to US $10.72 (NOK 66.1) in Oslo, the lowest intraday level since Oct. 20, 2011. In Stockholm, Lundin fell as much as 11% to $18.87 (NOK 116.3), the lowest intraday level since Oct. 4, 2011. Statoil was unchanged at $23.30 (NOK 143.6).

“We do not rule out that the soft update may be a tactical game from Statoil,” Teodor Sveen Nilsen, an analyst at Swedbank First Securities, said in an email. “We think Statoil wants to increase its owner share in the field. Thus we see no reasons why Statoil should talk up the value of Sverdrup.”

A concept selection for Sverdrup, originally due by year-end, was delayed until early 2014, Norway’s biggest energy company and acting operator of the project said in its statement. The owners, which also include Petoro AS and Maersk Oil, have yet to agree on the size of investments, said Oeivind Reinertsen, Statoil’s senior vice president for the project.

Partner Disagreements

“It takes time to find an optimal resource utilization,” he said in a phone interview. “It’s reasonable and even healthy that we have different views on how this should be developed.”

Disagreements about the size of installations and initial investments resulted in the delay, said a person with knowledge of the situation, who declined to be identified by name. The delay is also “likely due to disagreements over electrification of the field” and other developments in the area, Platou’s Gheorghe said.

“It’s a big project, a giant, a fantastic field,” Torgeir Anda, a spokesman at Det Norske, said by phone. “Spending a little more time must be OK. It’s only natural that it gets a little heated when you’re negotiating and agreeing on a field with so enormous a value.”

Investments in the project’s first phase are seen at $16.2 billion to $21 billion (NOK 100 billion to NOK 130 billion), Det Norske said in a separate statement. That includes electrification from shore, Anda said.

The Sverdrup partners plan to award a contract for FEED “before the New Year,” Statoil’s Reinertsen said.

Engineering Contract

Aker Solutions ASA, the “clear frontrunner” according to Pareto Securities AS, has said a failure to win the contract would be a “big loss” for both the company and the Norwegian oil and gas industry.

A plan for development and operation should be approved by Norway’s parliament in the spring of 2015, the company said.

Plateau production could reach as much as 600,000 b/d, Lundin has said earlier. That would make Sverdrup Norway’s largest oil-producing field. None of the country’s oil fields have produced as much since Statfjord in the early 1990s, according to figures from the Norwegian Petroleum Directorate (NPD).

Norway, western Europe’s largest oil and gas producer, will see crude output drop for a 13th year in 2013, the NPD said in January. Oil and gas production is expected to rise from next year to 2021 as fields including Sverdrup and Edvard Grieg come onstream. Still, even peak output from Sverdrup will not prevent Norwegian energy output from declining after that, falling more than 30% by 2030, according to NPD forecasts.

Statoil is the largest stakeholder at Sverdrup with a 40% interest in licenses 265 and 501, which contain most of the field, and a 44% stake in a third, license 502. Lundin has 40% in 501 and 10% in 265. Petoro has 30% of 265 and 33% of 502. Det Norske, based in Trondheim, has 20% of 265 and 22% in 502, while Maersk Oil has 20% of 501.