Abundant coal seams occur in the Lower Cretaceous section of the Elmworth area. Gas desorbed from pressurized cores of coal indicates there are about 500 cu ft of methane per ton of coal. In addition to being a significant source for gas in the Deep basin, the coalbeds themselves contain about 50 tcf of gas in place. It is probable that some of this gas can be recovered through processes of diffusion from the matrix and Darcy flow in natural fractures. Where coal is adjacent to producible sands or conglomerates, mathematical modeling shows that at least half of the gas contained in the adjacent coal can be recovered. Additional gas may be recovered from isolated coal seams; further field testing will determine this potential.
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Elmworth: Case Study of a Deep Basin Gas Field
This publication documents the geology and techniques used to explore Elmworth, the largest gas accumulation in Canada. Elmworth is peculiar in that gas lies downdip from water although no impermeable barrier lies between.