I had the pleasure of addressing the annual meeting of the Houston chapter of the Gas Processors Association this week on the subject of shale-gas plays—who’s in them, and where. Here’s a list of producers active in each play.

It’s a short list of known players. For each player named, up to 100 small, private firms are likely involved in the play as well, even if it is only by virtue of just holding acreage in the play.

Want to add a name? E-mail me at ndarbonne@hartenergy.com. Thanks!

– Woodford: Chesapeake, BP, Newfield, PetroQuest, Unit Petroleum, St. Mary, Carrizo, Bankers Petroleum.

– Barnett: Devon, EnCana, EOG, Chesapeake, Talisman, Carrizo, Pioneer, Williams, XTO, Range, Quicksilver, Denbury, Penn Virginia, Nortex Resources, Titan Operating, Spindletop O&G, Miller Energy, ReoStar, Exterra Energy.

– Fayetteville: Southwestern, XTO, Chesapeake, BP, Petrohawk, Shell, Storm Cat, Energen, Maverick O&G .

– Marcellus: Range, Equitable, Chief Oil & Gas, Chesapeake, Talisman, Antero, Dominion, Anadarko, Southwestern, CNX, EOG, Cabot, Penn Virginia, Marathon, Exco, Unit Petroleum, Atlas Resources, Rex Energy, NFG/Seneca, J-W Operating, Trans Energy, Epsilon Energy.

– Haynesville: Ark-La-Tex Energy, Berry Petroleum, BEUSA, Cabot, Camterra Resources, Carrizo Oil & Gas, Chesapeake Energy, Comstock Resources, Continental Resources, Coronado, Cubic Energy, Cypress Operating, Devon, El Paso, Ellora Energy, EnCana, Encore Acquisition, EOG, Exco, Forest Oil, Fossil, Franks Operating, GMX Resources, Goodrich, Indigo Minerals, J.W. Operating, Live Oak, Long Petroleum, Mainland Resources, Matador, Nadel and Gussman, Jetta, Noble Energy, Penn Virginia, Petro-Chem, Petrohawk, Pinnacle Operating, Plains, Questar, Rising Star, Samson, Shell, Southern Star, Southwestern, St. Mary, Stroud Petroleum, TM Resources, Will-Drill, Winchester, XTO.

–Nissa Darbonne, Executive Editor, Oil and Gas Investor, A&D Watch, OilandGasInvestor.com Today, OilandGasInvestor.com , A-Dcenter.com ; ndarbonne@hartenergy.com