A gas state, by a wide margin.
Pennsylvania produces more natural gas than any state other than Texas. That production is concentrated in two distinct centers, both within the Marcellus Shale. The northeast dry-gas core sits under Susquehanna, Bradford, Tioga, and Lycoming counties. The southwest wet-gas window, where gas comes up with valuable natural gas liquids, sits under Washington, Greene, Fayette, and Westmoreland.
Pennsylvania mineral title is older and more tangled than in most western states. Many tracts were severed (mineral rights split from surface rights) in the late 1800s, often during the early oil and timber boom. Inheritors today sometimes own mineral interests they never knew existed, alongside surface owners who never knew their land was severed. Sorting that out is part of what we do.
Pennsylvania is also unusual for what it does not have. It does not have a state severance tax. It does not have effective forced pooling. Mineral owners in Pennsylvania have more leverage than counterparts in many neighboring states, simply because operators cannot drill across an unleased interest the way they can in West Virginia or Oklahoma. That leverage cuts both ways and worth understanding before you sign anything.