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Controls on Methane Adsorption Capacity of Lower Cretaceous Coals from Northeastern British Columbia, Canada: Part 1--Geology, Rank Variation, and Adsorption Isotherms

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This study examines the high-pressure methane adsorption capacity of coals in the Gething Formation, Peace River coalfield, northeastern British Columbia, Canada. The Gething coals have higher than expected methane adsorptive capacity based on their rank. For example, at 1,000 m depth and 1.7% Ro,max methane adsorption capacity ranges from 22-27 cc/g (daf) (700-870 scf/ton), whereas gas content estimated using the Eddy curves and the Ryan Equation is about 17 cc/g (daf) (545 scf/ton). This study also describes the geology, regional rank variations, maceral composition, and coal quality characteristics of the Gething coals in an attempt to rationalize the adsorption isotherm data of the coals.
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Keywords: British Columbia; Gething Formation; adsorption; coalbed methane; petrology

Document Type: Research Article

Affiliations: 1: British Columbia Ministry of Energy, Mines and Petroleum Resources, Geological Survey Branch, Victoria, British Columbia, Canada 2: CDX Canada Company, Calgary, Alberta, Canada

Publication date: December 1, 2003

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