Below is a sample of isotherms from one the projects in the Mannville Coals of Alberta (Canada). According to Seidle, it is important to understand the isotherm variability across a field. The example belows shows the variability for DAF isotherms across a small distance in the Mannville coals
References:
-
John Seidle, “Fundamentals of Coalbed Methane: Reservoir Engineering”, 2011, PennWell Corporation.