CCSにおけるモニタリング技術と今後の展望

抄録

Monitoring is important for the safe operation of carbon dioxide capture and storage（CCS）projects. According to the Act on CCS business enacted in May 2024, operators must submit and get approval for monitoring plans.

Early in a CCS project, risk analysis is critical, involving identification and mitigation planning. The monitoring plan must be based on risk analysis and reflect site-specific geological characteristics and societal acceptance, balancing cost with effectiveness.

Baseline survey must be conducted before CO₂ injection. Monitoring techniques, including repeated seismic surveys pressure and temperature observation, help assess the behavior of CO₂ and update reservoir models.

Monitoring methods must be selected based on their suitability, cost-effectiveness, and ability to address site-specific conditions. Emerging technologies, like distributed acoustic sensing（DAS）, offer promising avenues for more affordable and efficient monitoring. CCS projects should continuously adapt monitoring strategies to incorporate new efficient technologies and improve validation processes.