I remember back in high school in the early ‘80s I was told Texas was drying up, and that the oil there was too expensive to get out ... hoo wheee!
Russia, Saudis ... if you want big oil money, we get our cut. Take your pick.
They forgot about fracking and newer gas/fluid injection methods to extract out oil. They're now using pressurized steam, pressurized CO2 gas and even special detergent-like fluid injection to extract out oil from supposedly "tapped out" oilfields. As such, the size of Texas' oil reserves has gone through the roof.