Owning oil is not the be all and end all.
If it were Venezuela would have an empire.
Arab sheikhdoms likewise. Saudi Arabia would own Yemen.
Or, heck, the US would have managed to prop up South Vietnam.
There are plenty of factors feeding national power. Having powerful friends for instance.
As for US reserves, the US is currently tapping immense resources in oil shale. Current tech can keep the US energy independent indefinitely. And that is because just a little exploration consistently finds more. The only thing holding the US back is political will.
Don’t use words like immense. Use specific numbers, and with specific API viscosity quotes. Shale is light tight oil. Urals is not. One is diesel rich with constituent proportions up near 40%. The other is not. Guess which.
80 million year geology doesn’t care about politics.