Earlier quoted context omitted.
The tensions don't exist because of its oil. They exist because of their natural resources which may or may not include oil. Look all over africa for examples. Being rich in natural resources is a bit like being a really hot girl around a bunch of abusive predatory men. They'll shower her with gifts and tell her how amazing she is until she says: "no, I don't want to sleep with you" and all hell breaks loose.
western economists unironically call it the resource curse: https://en.wikipedia.org/wiki/Resource_curse examples include Saudi Arabia, Norway and Alaska. Oh no wait bad examples.
I didn't know Alaska was a country.
I don't really know much about Norway's petrolium history, but I can't say I'm surprised that they weren't invaded for their oil, which is in the sea to begin with.