From Fort Worth Star Telegram

http://blogs.star-telegram.com/barnett_shale/2012/08/an-overview-of...

... a few lines

Powell Shale Digest has a one-page summary of production and well data for nine major U.S. natural gas and crude oil shale regions. It shows nearly 36,000 wells, with total production of nearly 23 trillion cubic feet of gas and 682 million barrels of oil and condensate from the Barnett, Fayetteville, Eagle Ford shales, and multiple areas of the Haynesville, Bakken and Marcellus shales. The data is free and the link is here.

(Editor's note: An earlier version of this post used a figure of "nearly 40,000 wells" from the original Powell Shale Digestreport. The authors of that report later corrected the number.)