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Transcript of Coalbed Methane
geological history of the coal
previous depressuring of the coal methane production increases with increased depth increased depth means increased pressure increased pressure = decreased permeability closes cleats therefore, generally get: low methane concentration and high permeability high methane concentration and low permeability Alberta relatively low gas content
south-central Plains potentially favourable cleating
high gas contents, locally
north-central to central Plains moderate gas content
Pembina area Foothills CBM e.g.Kootenay coal tend to be higher methane content (higher rank) but poor permeability and continuity because of structural disruption Environmental Issues methane in aquifers saline water e.g. N. Alberta farmers with methane in thier well water may be naturally occurring or from drilling activity from dewatering formations must properly dispose of extracted water re-injected into similar environment generally, salinity increases with depth
but amount of water decreases if non-saline may be used, e.g. agriculture