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

Figure 13

The Schoell diagram of methane gas samples in the Dimock, Sugar Run, and Gregs Run (HOGR-D) study areas. B: bacterial (microbial) gas; TO: oil associated thermogenic wet gas; TC: condensate associated thermogenic wet gas. Mud Gas Log (MGL) mean values from Baldassare et al. [34]: 1—Marcellus Shale; 2—Hamilton Group (Mahantango Shale); 3—Tully Limestone; 4—Geneseo Shale; 5—Brallier Formation; 6—Catskill/Lock Haven Formations. Water well HO8B had anomalous samples as explained in the text.