Utilization of seismic attenuation in the monitoring of CO2 geological storage project

Aiming quantitative monitoring of subsurface in CO2 geological storage project, this paper presents relationship between seismic attenuation and CO2 saturation. The relationship enables more reliable quantitative monitoring, because seismic attenuation becomes available for estimating amount of CO2 in addition to seismic velocity. We introduce theoretical relationship which is built with patchy saturation model and standard linear solid model. In order to validate the models and the methodology, we compare the predicted attenuation with an experimental dataset. The result shows good agreement; therefore the methodology is considered to be appropriate to establish the relationship between seismic attenuation and CO2 saturation. (C) 2014 The Authors, Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/).