We discuss the physical aspects on well log integration with seismic and time-lapse seismic characterization for CO 2 injection based on a 1D thinly layered model. The results show that discrete layering and interval multiple reflections within sedimentary sequences have a significant influence on synthetic seismograms. The changes in reservoir velocity and density caused by CO 2 injection will mainly result in waveform distortions from the top of the reservoir to the base reflection near the reservoir. Large reservoir velocity changes may cause a time lag for the base reflection as well as deeper events. Those results have important implications for time-lapse seismic monitoring.
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