Amanda M. Bustin, X. Cui, and Robert M. Bustin, University of British Columbia, Vancouver, BC
Knowledge of the pore structure of gas shales and other micro-porous rocks is of critical importance in establishing the original gas in place and flow characteristics of the rock matrix. Methods of measuring pore volume, pore size distribution, sorptive capacity, and flow characteristics of shales inherited from the coalbed methane and conventional reservoir rock analyses, although widely applied, are of limited value in characterizing many shales and may yield erroneous results. The use of He as routinely applied to measure porosity, permeability, and diffusivity may result in non-systematic errors due to the molecular sieving effect of the fine pore structure to larger molecules such as reservoir gases. Utilizing gases with larger adsorption potentials than He, including nitrogen and all reservoir gases, to measure porosity or permeability of rocks with high surface area.
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