Seidle [2011] provided a plot of coal permeability (field and theoretical models) for a variety of CSG Plays as shown below:
An example of permeability growth during depletion for a Fruitland Coal well in the San Juan Basin (referred to as “FCF well 2” by Salmachi et al (2018) is shown below:
Reference:
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John Seidle, Fundamentals of Coalbed Methane: Reservoir Engineering, 2011, PennWell Corporation.