Gas migration pathways, controlling mechanisms and changes in sediment acoustic properties observed in a controlled sub-seabed CO2 release experiment

摘要: Carbon capture and storage (CCS) is a key technology to potentially mitigate global warming by reducing carbon dioxide (CO2) emissions from industrial facilities power generation that escape into the atmosphere. To broaden usage of geological as viable climate mitigation option, it vital understand CO2 behaviour after its injection within reservoir, including potential migration through overlying sediments, well biogeochemical ecological impacts in event leakage. The release were investigated controlled experiment injected at known flux shallow, under-consolidated marine sediments for 37 days. Repeated high-resolution 2D seismic reflection surveying, both pre-release syn-release, allows detection CO2-related anomalies, including: chimneys; enhanced reflectors subsurface; bubbles water column. In addition, coefficient attenuation values calculated each repeat survey, allow impact on sediment acoustic properties be comparatively monitored throughout gas release. interpreted being predominantly stratigraphy early stages experiment. However, either increasing flow rate, or total volume become dominant factors determining later