CO2 pre-injected reservoir characterization on Cranfield with basis pursuit inversion

Time lapse surface seismic experiments have been proposed for monitoring CO2 injection in the subsurface. To monitor the CO2 effect on surface seismic data, precise analysis of 4-D seismic is needed to capture small changes between pre- and post-injection seismic data. We introduce a new technique - Basis Pursuit Inversion (BPI) - to invert for seismic reflection coefficients that has the potential to produce clearer images of subsurface structures than the conventional inversion methods. We demonstrate the application to a pre-injection seismic data volume from Cranfield, which has been a site for carbon sequestration study since 2007. Applications of BPI on the preinjection seismic data reveal more detailed structure and rock property information and thus has the potential for resolving CO2 plume movement during time-lapse seismic study.