The Energy Information Administration (EIA) has an interesting post on drilling rig activities in Pennsylvania and West Virginia:  "Drilling continues to shift out of the dry region of northeast Pennsylvania, where most natural gas production in the Appalachian Basin’s Marcellus Shale play has occurred. *** As part of this shift, drilling activity has increasingly moved from northern Pennsylvania to southwest Pennsylvania and West Virginia—or from dry to more liquids-rich parts of the Appalachian Basin (see chart below). Increases have also occurred in the number of oil-directed rigs in this region, particularly in the Utica Shale formation."