An Associated Press analysis reported on Saturday that Marcellus shale gas wells in Pennyslvania generated about $3.5 billion in gross revenues for drillers in 2011.
In addition, drillers in West Virginia produced an additional $1.2 billion.
Experts told the Associated Press that even more money will be derived in the futurure, in light of recent price drops for natural gas.
In 2011, the Marcellus shale produced just over 1 trillion cubic feet of gas in Pennsylvania and about 350 billion cubic feet of gas in West Vi9rginia.
Pennsylvania has about 2,200 wells that were inj production in 2011.
Ohio has almost no Marcellus shale production. It is developing the deeper Utica shale.
New York state has not allowed drilling.
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Chesapeake Energy Corp,the Oklahoma-based firm is the No. 1 driller in Ohio.
Rig Count Interactive Map by Baker Hughes, an energy services company.
Shale Sheet Fracking, a Youngstown Vindicator blog.
The Ohio Environmental Council, a statewide eco-group based in Columbus.
Earthjustice, a national eco-group.
People's Oil and Gas Collaborative-Ohio, a grass-roots group in Northeast Ohio.
Concerned Citizens of Medina County, a grass-roots group.
No Frack Ohio, a Columbus-based grass-roots group.
Fracking: Gas Drilling's Environmental Threat by ProPublica, an online journalism site.
Pipeline, blog from Pittsburgh Post-Gazette on Marcellus shale drilling.
Allegheny Front, environmental public radio for Western Pennsylvania.