The Eagle Ford Shale reaches across 25 Texas counties. But more than 60 percent — 141 of the play's 227 drilling rigs — are operating in five counties: La Salle, Karnes, McMullen, Gonzales and DeWitt, according to the Baker Hughes Rig Count, a barometer of the health of the drilling industry and an indicator of where companies are most interested in drilling.
Rigs are clustering along the Gonzales-Karnes county line, and lining up across all of DeWitt County, except for the southeastern quadrant.
Farther west, neighboring La Salle and McMullen counties have earned a reputation for being what's colloquially called “more oily,” producing more crude oil or natural gas liquids than the currently uneconomic dry gas.