Methodology of CO2 aquifer storage capacity assessment in Japan and overview of the project

Detection and impacts of leakage from sub-seafloor deep geological carbon dioxide storage

“…Carbon dioxide Capture and Storage (CCS) in deep geological formations provides an effective option to remove these emissions from the climate system 3 . In many regions storage reservoirs are located offshore 4,5 , over a kilometre or more below societally important shelf seas 6 . Therefore concerns about the possibility of leakage 7,8 and potential environmental impacts, along with economics, have contributed to delaying development of operational CCS.…”

Influence of dissolution on frictional properties of carbonate faults

“…The effect of temperature is integrated considering a geothermal gradient of 30°C/km and the normal stress at a given depth is calculated using a submerged unit weight of 15 kN/m 3 . In this diagram, we also highlight the shallower depth of a CO2 storage project, in order to keep the CO2 supercritical, which is 800 meters (Nakanishi et al 2009) and the shallower depth of acid gas injection project in western Canada, which is 705 meters (Bachu and Gunter 2002). We observe that the injection of an acid in a reservoir can lower the fractal number by dissolving the small grains and reach a value around 2.16 if 25% of the mass is dissolved and the initial fractal number is close to the value of a self-similar distribution (2.6).…”

Benthic megafauna and CO 2 bubble dynamics observed by underwater photography during a controlled sub-seabed release of CO 2

“…With offshore geological formations being identified as prospective reservoirs for CO 2 in many regions, e.g. Australia, Japan, UK and US (Heap et al, 2014;Holloway et al, 2006;Meckel et al, 2013;Nakanishi et al, 2009;Schrag, 2009), CCS has the potential to be a globally implemented solution. In addition, the process of storing CO 2 in sub-seabed geological formations is not new and has already been put to practical use by a number of energy companies.…”