Abstract
Unconventional natural gas resource including coalbed methane (CBM) is expected to be important in primary energy supply, although there is great uncertainty of its resource availability range in future. Enhanced coal bed methane (ECBM) technology is under development since it has advantage of CBM resource expansion as well as greenhouse gas mitigation by CO2 capture and storage (CCS). The author conducted sensitivity analysis of unconventional gas resource availability and existence of atmospheric CO2 concentration target, using global and long-term intertemporal optimization model. It is concluded that the unconventional gas resource amount uncertainty have substantial impact on global energy supply in the latter half of 21st century and ECBM enhances both CBM resource availability and CCS potential.
