The days of Jed Clampett’s easy oil, Spindletop, etc, were long gone decades ago.
: > )
Seriously though, things have changed a lot in the last few decades.
It's amazing because of the lack of future technology back towards the last few decades of the last century, alarmist/environmentalists were predicting running out of oil long before today.
The reserves are monumental with what has been found, and possible to extract, with the advances in technology.