The Eagle Ford Play extends across numerous South Texas Counties. Towards the North, the play is shallow and oily. Moving south, the play deepens dramatically and becomes exclusively gas-bearing. While the Eagle Ford Shale is the primary target zone in this play, the overlying Austin Chalk is also a popular target in some areas.
- Eagle Ford – Though commonly divided into the Upper and Lower Eagle Ford, the Lower Eagle Ford is the primary source rock for the play and the most common target zone for horizontal development.
- Austin Chalk – Located directly above the Eagle Ford, the Austin Chalk has been a known producer of oil and gas since the 1920s. The formation has seen renewed interest and increasing development in recent years, most notably in Karnes and Webb Counties.
- Other Horizontal Targets – Since 2008, horizontals completed outside of the Eagle Ford and Austin Chalk have been relatively limited. However, these “other” horizontals have commonly targeted the Edwards, Georgetown, Tuscaloosa, or Pearsall formations.