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To quantify and rank gas wettability of coal as a key parameter affecting the extent of CO2 sequestration in coal and CH4 recovery from coal, we developed a contact angle measuring system based on a captive gas bubble technique. We used this system to study the gas wetting properties of an Australian coal from the Sydney Basin. Gas bubbles were generated and captivated beneath a coal sample within...
Clastic sedimentary rocks associated with coal seams affect the retention of gas and the rate of escape of CO 2 and CH 4 from a coal seam gas (CSG) system. Quantifying sealing properties using a parameter based on molecular diffusion and permeation of gases through rock and coal matrices allows the effects to be evaluated.Observations made on a CSG system in the Hunter Coalfield, Sydney...
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