There are many types of geological formations used for CO
2 sequestration. Coal seam is one of them. The characteristics of the coal seam used for CO
2 sequestration are the methane recovery when CO
2 is sequestrated. CO
2 is injected into coal seam not only for the CO
2 sequestration but also for CH
4 recovery (ECBMR).
This paper reports the sequestration mechanism of CO
2 in the coal seam and the world R&D status in this field.
The adsorption is a main sequestration mechanism of CO
2 in the coal seam. In the field scale sequestration, pressure of CO
2 is super-critical. The adsorption volume of CO
2 in coal in that condition is not yet clarified. This adsorption volume is very important for the prediction of sequestrable CO
2 volume.
The present activities on this subject in the United States, Canada, Australia, Netherlands and Japan were reported. For the further studies, the international cooperative R&Ds are necessary. Items for the further R&Ds are summarized.
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