And then there’s Venezuela with the heavy crude, not difficult to get at; what stands in the way is the govt, as usual. The govt and the people who sit still for it.
Venezuela’s oil reserves are expensive to extract because the oil is either very viscous (I’ve seen samples of crude oil from Saudi Arabia and you could pour it out of a chemistry lab beaker at room temperature, while Venezuelan crude oil, if poured into a chemistry lab beaker after being heated, literally will stay in the beaker at room temperature just like California crude oil) or are in tar sands, which is even more expensive to extract out.