Coal Characterization and Transport Phenomena in Coalbeds

ABSTRACT

This research encompasses a laboratory evaluation of some parameters important to CBM production from Alberta coals, enhanced coalbed methane (ECBM) production, and greenhouse gas disposal. Coal permeability and gas storage capacity for different gases are two of the most crucial parameters in CBM and ECBM development. For this reason, much of the focus when assessing CBM reservoirs in Canada is on understanding cleats and natural fractures, both in outcrop and in core taken from well bores. Core flood experiments are conducted to measure the permeability to helium under equilibrium conditions. Data on equilibrium adsorption properties (adsorption isotherms) are also independently obtained. Coal characterization studies using imaging devices are presented. X-ray computerized tomography (CT) and micro CT are used on coal samples, to provide a better understanding of fracture morphology and apertures. Visualization at both resolutions allows for discussion and comparison of structural characteristics at both scales.

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