Evaluating geological sequestration of CO2 in bituminous coals: The southern Sydney Basin, Australia as a natural analogue

In situ CO2 contents of Sydney Basin coals range up to 20 m3/t. Comparisons of adsorption isotherm data measured on ground coal particles with in situ gas contents of Sydney Basin coals indicate that the volumes of CO2 stored do not exceed ∼60% of the total CO2 storage capacity. Therefore, the maximum CO2 saturation that may be achieved during sequestration in analogous coals is likely to be considerably lower than the theoretical values indicated by adsorption isotherms.