Earlier quoted context omitted.
> The oil age is ending in Norway. With "oil age" you mean the use of oil, or its production?
Production. The North Sea reached "peak oil" some time ago. Although there have been recent increases in production, the total output is much lower than it was around 2000. http://www.crystolenergy.com/assessing-future-north-sea-oil-...
In terms of future expansion, one has to consider the unexploited oil reserves that Norway still has hidden in its sleeves. Take Lofoten, Vesterålen and Senja which hold about 1.3 billion barrels of oil. As a comparison, the UK's entire oil reserves is 21 billion barrels.
For now, the government has decided not to start exploiting this area. However, a lot can happen in 10-20 years time. There may also be other undiscovered oil reserves along the coast line.
Add to this, Norway claims 2.7 million sqm of Antarctica, about 20% of the entire continent. Let's hope the world never comes to the point where nations will argue over this continent because it would not end well. You can be sure there's a lot of oil hiding there, though. 203 billion barrels worth according to some wild speculations (I would not trust that number at all, but it is plausible that the number is high).