In 20 years, all your easy to get oil and gas will be long gone. It dosen't last forever. We have one of the largest gas fields in the US and it is starting to suffer from high cost extraction.
Wyoming only has about 150 years left of coal at the current pace. That should bridge any gaps until new tech comes along.
Plus there is not a pipeline going from every well head to a distribution hub. The economics don't warrant that considering a well has a very finite time to produce. Why put in a pipline to only have to abandon it a few years later. I know how the oil and gas game works, we have it here to.
wiki.aapg.org