Royal Dutch Shell Plc. reports two successful Utica shale wells in north-central Pennsylvania.
The natural gas-producing wells were both in Tioga County.
That is about 100 miles northeast of the nearest Utica well in western Pennsylvania.
The Utica shale in Pennsylvania is deeper than the Marcellus shale and more costly to drill.
The news potentially expands the Utica shale sweet spot from Ohio, western Pennsylvania and northern West Virginia into north-central Pennsylvania.
Click here to read the latest story from the Houston Chronicle's FuelFix blog.
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.