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[HSC05-05] Numerical analysis on CO2 storage capacity
Keywords:Carbon dioxide capture and strage, TOUGH2, Reservoir Simulation
In this research, we adopted a numerical analysis method to evaluate CO2 storage capacity. After a geological model was built, we carried out simulations of CO2 injection. For the simulation for multicomponent / multiphase fluid, TOUGH2-ECO2N code used. Comparing he "Volumetric Method" with the result of the numerical analysis, the latter was estimated to be about 65% of the former.
From the analogy of oil/gas field, the CO2 storage capacity evaluated by the “Volumetric Method” corresponds to "Resources amount" and that evaluated by numerical analysis would be "Reserves". As a result, the difference between the “Volumetric Method” and the result of numerical analysis seems to be generally reasonable.
In addition to the storage capacity evaluation, numerical analysis can give estimation on the pressure build-up in the reservoir and the distribution of the CO2 plume. Hence, it is expected that the design of the location and number of injection wells, injection rate, injection period installation of pressure mitigation wells etc. could be evaluated from the analysis results.