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

[HSC07-08] Seismic source development for CO2 storage monitoring with consideration of marine noise issues

*Naoshi Aoki¹, Fumitoshi Murakami¹, Eiichi Asakawa¹, Takeshi Kozawa¹, Susumu Abe¹, Takuya Miura², Takao Nibe², Katsuhei Yoshioka², Takeshi Tsuji³ (1.JGI, Inc., 2.JAPEX, 3.Graduate School of Engineering, The University of Tokyo)

Keywords:CO2 storage monitoring, Air gun, PASS, marine vibrator

Most of Japan's candidate CCS sites are located in coastal waters. Coastal areas are often suitable for CCS because of their proximity to CO2 emission sources and geological storage. However, it should be noted that these areas also have a thriving fishing industry. Building good relationships with fishermen is essential for a stable CCS project. The sound pressure level of the artificial seismic source "airgun arrays" used for structural surveys to select suitable sites for CCS projects and for seismic surveys to monitor the spread of the injection plume is high and is one of the known causes of marine noise problems. This presentation describes the concept and current status of two types of our seismic sources: portable active seismic sources installed in shallow boreholes on the seafloor to isolate them from benthic animals, and towed marine seismic vibrators used for time-lapse seismic surveys to reduce sound pressure to a level that does not affect marine life.