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

Figure 9

Topographic map with track from the 3-4 June 2013 Towanda-Wyalusing ambient air survey [14]. Sites A, A1, B, C, and D represent above background (1.9 ppm) levels (maximum 3.9 ppm at site B). Moderate (forested) and dark (emergent) green features are wetlands. Light (ponds) and dark (lakes) blue features are water bodies. W1-W5 and S2 are Welles series gas wells. Impacted domestic water wells 1-6 along Paradise Road are clustered in the black square symbol. There are two joint-parallel tributaries to Sugar Run, and a thrust fault identified from seismic data [13]. Water wells (BHX) along or near PA Route 187 were impacted, and bubbling of methane occurred in the Susquehanna River [55].