Gulf Coast

Barnett Shale

Barnett Counties:

TX: Bosque, Clay, Cooke, Dallas, Denton, Erath, Hamilton, Hill, Hood, Jack, Johnson, Montague, Palo Pinto, Parker, Somervell, Tarrant, Wise

Eagle Ford Shale

Eagle Ford Counties:

TX: Atascosa, Bee, DeWitt, Dimmit, Fayette, Frio, Gonzales, Karnes, LaSalle, Lavaca, Live Oak, Maverick, McMullen, Webb, Wilson, Zavala

Eaglebine

Eaglebine Counties: TX: Brazos, Burleson, Grimes, Houston, Lee, Leon, Madison, Milam, Robertson, Walker

Haynesville Shale

Haynesville Counties:

LA: Bienville, Bossier, Caddo, DeSoto, Natchitoches, Red River, Sabine, Webster

TX: Gregg, Harrison, Nacogdoches, Panola, Rusk, Sabine, San Augustine, Shelby

Lower Smackover/Brown Dense

Lower Smackover/Brown Dense Counties: AR: Ashley, Bradley, Calhoun, Columbia, Hempstead, Lafayette, Miller, Nevada, Ouachita, Union
LA: Clairborne, East Carroll, Morehouse, Ouachita, Richland, Union, West Carroll

Permian Basin

Permian Counties:

TX: Andrews, Borden, Brewster, Cochran, Coke, Concho, Cottle, Crane, Crockett, Crosby, Culberson, Dawson, Dickens, Ector, Edwards, Fisher, Floyd, Gaines, Garza, Glasscock, Hale, Hockley, Howard, Hudspeth, Irion, Jeff Davis, Kent, Kimble, King, Knox, Lamb, Loving, Lubbock, Lynn, Martin, McCulloch, Menard, Midland, Mitchell, Motley, Nolan, Pecos, Presidio, Reagan, Reeves, Runnels, Schleicher, Scurry, Sterling, Stonewall, Sutton, Taylor, Terrell, Terry, Tom Green, Upton, Val Verde, Ward, Winkler, Yoakum

NM: Chaves, Eddy, Lea

Tuscaloosa Marine Shale

Tuscaloosa Marine Counties: LA: Allen, Avoyelles, Beauregard, Catahoula, Concordia, East Feliciana, East Baton Rouge, Evangeline, Grant, LaSalle, Livingston, Natchitoches, Point Coupee, Rapides, Sabine, St. Helena, St. Landry, St. Tammany, Tangipahoa, Vernon, West Feliciana, Washington
MS: Adams, Amite, Franklin, Pike, Walthall, Wilkinson