Feasibility modeling of time-lapse seismic noise interferometry for CO2-monitoring

Arie Verdel , Jan Thorbecke , Deyan Draganov

In ambient noise seismic interferometry for body wave retrieval, data traces are measured over a long period of time and correlated with each other to attempt to retrieve P-wave reflection data that can be interpreted in terms of contrasts in elastic subsurface layer properties. It is the intention at TNO Geo Energy to use this technique in a time-lapse application: the monitoring of CO2-migration paths in the subsurface at the demonstration site for CO2-sequestration in Ketzin, Germany. The quality of the retrieved reflection data is, among others, dependent on the number of noise sources measured during the recording time, the source strength distribution, and the source location distribution. In this paper, we present modeling results representing a feasibility study of the utilization of ambient noise seismic interferometry for monitoring the Ketzin subsurface. We investigate the dependence of the results on the variation, with time, of subsurface elastic layer properties due to injection-induced in-situ CO2-saturation changes. For this purpose, dedicated finite-difference modeling software was used that was developed recently at Delft University of Technology. The outcome of this study will determine whether the Ketzin field data could actually be used for application of the ambient noise interferometry technique for CO2-monitoring.

Mots clés: interferometry; noise; monitoring; CO2

Domaines: Acoustique [physics.class-ph]

Arie Verdel, Jan Thorbecke, Deyan Draganov. Feasibility modeling of time-lapse seismic noise interferometry for CO2-monitoring. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810865⟩