Pathways and Environmental Impacts of Methane Migration: Case Studies in the Marcellus Shale, USA

Figure 8

Plot of δD against δ¹³C (per mil) for methane sampled from the annuli of gas wells (Welles 2, 3, 4, and 5 series) and impacted water wells (wells 1, 3, and 5). Isotopic data were not available for other impacted water wells. Predrill private well data were collected throughout Bradford, Sullivan, Susquehanna, and Tioga counties in NE Pennsylvania [34]. Reproduced from Llewellyn et al. [13].