Spanish-owed Repsol owns 214,000 net acres of leases in the Marcellus Shale, primarily located in northeastern Pennsylvania in Bradford, Susquehanna, and Tioga counties. Earlier this year, Repsol said it was working with certification authority MiQ to have all of its Marcellus production (roughly 1.5 billion cubic feet per day from ~680 wells) certified as “responsibly produced”