The Energy Information Administration recently commissioned INTEK, Inc., to assess the technically recoverable onshore shale gas and shale oil resources of the lower 48 states as of January 2009. Among other things, INTEK found:
Eighty-six percent of the total 750 trillion cubic feet of technically recoverable shale gas resources identified in Table 1 are located in the Northeast, Gulf Coast, and Southwest regions, which account for 63 percent, 13 percent, and 10 percent of the total, respectively. In the three regions, the largest shale gas plays are the Marcellus (410.3 trillion cubic feet, 55 percent of the total), Haynesville (74.7 trillion cubic feet, 10 percent of the total), and Barnett (43.4 trillion cubic feet, 6 percent of the total).
Very interesting. For more, see here.