Feasibility Study of Time-lapse-seismic Monitoring of CO2 Sequestration

Background studies are made prior to the beginning of the injection to ensure the security of the geological sequestration of CO2. In the CaMI.FRS site near Brooks, Alberta, numerous wells give the information about the lithology, the porosity, the permeability, the velocities (and others parameters) of the medium. In addition to logs data, seismic surveys were conducted in order to characterize the subsurface. After acquiring well logs information and baseline seismic surveys, we applied numerical simulations in order to characterize the feasibility of the time-lapse seismic monitoring. Indeed, once the injection begins, seismic survey will be made at regular intervals to monitor the CO2 injection. Fluid simulations allow us to work on synthetic models, but yet are close to what it is expected in the reality. We use Gassmann fluid substitution to obtain the elastic parameters (VP, VS and density) at different injection times (1 year after the beginning of the injection and 1 year after the end of the injection), for a 300m depth CO2 reservoir. In those 3D models, synthetic data are generated then processed. This work give us a good approximation of the feasibility of a time-lapse seismic monitoring, considering the conditions of CaMI.FRS project.