Beyond the points others are making about oil/gas being different, major powers don't fight each directly over oil and gas. At beat up on countries who can't f

Beyond the points others are making about oil/gas being different, major powers don't fight each directly over oil and gas. At beat up on countries who can't fight back. And even then, its not really to steal oil, but just ensure that it is flowing. The only real attempt to seize foreign oilfields was the Iraqi invasion of Kuwait. That didn't really go well for Iraq. And, on their way out, they scorched earth and lit 80% of the wells on fire.