It is going to be a long time before these fields are played out. They are massive.
They’re also renewable.
Like you said, the deposits are massive on a scale that most people have no idea. Plus, there are massive deposits in Mexico that have barely been tapped. Pemex has announced that they will, for the first time, allow foreign oil companies to partner with them to extract oil and gas.
The only thing holding back the oil industry is Washington and the ignorant people who are in leadership positions.