oa A Study of Sensitivity and Resolution of CO2 Reservoir Monitoring Using CSEM

Models have been tested to verify the feasibility of CSEM method for monitoring the CO2 injection in the Hontomín storage site (Burgos, Spain). A simple but realistic stratified resistivity model has been used during the modelling. CO2 responses have been evaluated considering 1D and 3D plumes of realistic size and resistivity values. With the goal of achieve optimal frequency emission range and adequate source-receiver configuration, several monitoring desings have been compared. A downhole-to-surface configuration with a vertical electromagnetic source located beneath or inside the CO2 plume seems to maximize the effect of carbon dioxide. The electric field amplitudes to be measured have been compared with the electromagnetic noise in the area, revealing large enough signal-to-noise ratio. Results show that the CO2 response can be clearly detected by meas