The Barnett Shale is located in the Fort Worth Basin in Texas. Oil and gas activities in Texas are regulated by the Railroad Commission of Texas. The web site is here:
The Railroad Commission of Texas classifies counties in Texas a core or non core. The core counties are Denton, Johnson, Tarrant and Wise.
The non core counties are Bosque, Clay, Comanche, Cooke, Dallas, Ellis, Erath, Hamilton, Hill, Hood, Jack , Montague, Palo Pinto, Parker, and Somervell.