Abstract
Summary Injection of CO2 in a geological subsurface will cause changes in seismic velocities, dispersion and attenuation, which result in changes in seismic wave propagation and seismic imaging. Estimating seismic attenuation changes from the seismic section with CO2 plume can provide some valuable information about CO2 storage, migration and possible leakage. We apply a frequency-dependant AVO inversion (FDAI) and Q value estimation method to a seismic dataset acquired in a CO2 injection area. The computed and inverted dispersion and attenuation results reveal the distribution of the CO2 injected into the reservoir sand. There are significant dispersion and attenuation in the CO2 plume, but the attenuation change is complex around and within the plume as the pressure changes after CO2 injection.
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