Abstract 地下深部塩水層における二酸化炭素地中貯留のシミュレーション技術および長岡圧入実証試験への適用
Simulation Technology of Geological CO2 Sequestration and Its Application to Pilot Test in Nagaoka, Japan
資源と素材, 124, 87-94, 2008.
大熊 宏


The simulator for geological CO2 sequestration was developed by adding to a commercial compositional oil reservoir simulator the functions of geochemical reactions and fracture occurrence/fault activation. The resulting simulator, GEM-GHG, was verified with a number of validation runs and is believed to be one of the most advanced and robust simulators of this kind today. The simulator was made use of for various purposes throughout the pilot CO2 injection test at Nagaoka, Japan. During the planning stage, the simulation studies were conducted repeatedly to confirm the technical feasibility of the test plan. Once CO2 injection began, the objectives of simulation were history matching and interpretation of the observed injection performances. Reasonable agreement of the bottom-hole pressures and the breakthrough times was attained by varying uncertain parameters such as relative permeability curves, areal changes in permeability, and vertical permeability.
The final aquifer model of the history matching was employed to predict the long-term CO2 movement. The results implied that the CO2 movement would be very limited after the end of injection and the injected CO2 would essentially remain within the injection zone in the pilot test area.

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