Abstract
Summary Seismic monitoring of the injected carbon dioxide (CO2) distribution at depth is an important issue in the geological storage of CO2. To help monitor changes in the subsurface during CO2 injection a series of 2D seismic surveys were acquired within the framework of the CO2SINK and CO2MAN projects at Ketzin, Germany, at different stages of the injection process. Here we investigate the use of seismic waveform tomography as a qualitative tool for time-lapse seismic monitoring given the constraints of the limited maximum offsets of the 2D seismic data. We applied seismic waveform tomography to the real timelapse data from the Ketzin site along with conventional seismic time-lapse processing. Both methods show a similar qualitative distribution of the injected CO2 and compare well with the results of more extensive 3D timelapse monitoring in the area.
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