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

Figure 4

The Schoell diagram of methane gas samples in the Dimock study area analyzed by multiple researchers as described in the text. Adapted from Schoell [33]. B: bacterial gas; M: mixed gas; TO: oil associated thermogenic wet gas; TC: condensate associated thermogenic wet gas; TD: dry thermogenic gas. The figure is from Hammond [10] and modified to add stream samples collected at MC US2 and include 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.