You can't reduce economic growth to single factor. Oil itself wouldn't be worth much without technologies to exploit. And without the right human capital, those

You can't reduce economic growth to single factor. Oil itself wouldn't be worth much without technologies to exploit. And without the right human capital, those technologies wouldn't exist in the first place. And without the right socioeconomic institutions in place (stable government, judicial system, etc.), we wouldn't be able to do much with either the technology or the resource.