24/7 Wall St. | Rex Tillerson's Last Deal? Exxon Mobil To Pay $6B To Bass Family For Permian Oil Forbes The origin of their $10 billion fortune was Sid Richardson, who in the 1930s amassed a fortune as one of the great Texas oil wildcatters. A bachelor and childless, Richardson left most of his oil assets to his foundation, but a chunk went to the four ... Big Acquisition Doubles Exxon Mobil's Permian Basin Oil Assets |