Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

H (Human Geosciences ) » H-SC Social Earth Sciences & Civil/Urban System Sciences

[H-SC07] CCUS (Carbon Dioxide Capture, Utilization, and Storage) for Climate Mitigation

Wed. May 29, 2019 10:45 AM - 12:15 PM 301B (3F)

convener:Masao Sorai(Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology), Ziqiu Xue(Research Institute of Innovative Tech for the Earth), Masaatsu Aichi(Graduate School of Frontier Sciences, University of Tokyo), Chairperson:Ziqiu Xue(Research Institute of Innovative Technology for the Earth)

11:30 AM - 11:45 AM

[HSC07-10] Gravity monitoring using superconducting gravimeters near the seashore at the Tomakomai CCS demonstration site

*Hiroki Goto1,2, Mituhiko Sugihara1,2, Hiroshi Ikeda3, Yuji Nishi1,2, Tsuneo Ishido1,2, Masao Sorai1,2 (1.Geological Carbon Dioxide Storage Technology Research Association, 2.National Institute of Advanced Industrial Science and Technology, 3.University of Tsukuba)

Keywords:offshore CO2 geological storage, superconducting gravimeter, groundwater

Monitoring the distribution and migration of CO2 injected into geological formations is needed for management of geological storage of CO2. Superconducting gravimeters (SG’s) potentially enable monitoring of offshore CO2 storage at ground-based stations because of its high precision. We conducted continuous gravity observations using SG’s near the seashore at the Tomakomai CCS (carbon dioxide capture and storage) demonstration site, Japan to study variation in the observed gravity near the seashore. The gravity data after correcting for tides, polar motion, and barometric pressure changes was strongly affected by shallow groundwater level changes but it was corrected by expressing their effects as a summation of linear functions of groundwater level changes. The standard deviation of the gravity residuals was reduced to less than 1 μGal after correcting for the groundwater effects. The small variation in the observed gravity residuals suggests that the ground-based gravity monitoring using SG's can be useful in long-term monitoring of offshore CO2 storage.