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

Figure 2

Adapted from Payne et al. [12]. Ambient CH₄ measurements collected from an area near Dimock, PA. Yellow lines are locations of CH₄ measurements. The vertical height of each line is proportional to the elevation of the CH₄ level at that location above the local reference level that day (1,966 ppb). The highest level (22,300 ppb) was emitted from the Herb Button (Teel) compressor station. Downwind was a diffuse emission (4,145 ppb) from the Meshoppen Bog. A minor plume is shown by the red lines near MC US3. Background levels occurred near MC US 2. Significant gas wells are GW-2, GW-7, and GW-8/8a/8b [10].