Well-seismic bandwidth and time-lapse seismic characterization: physical considerations

Yinbin Liu, Donald C. Lawton, Gary F. Margrave

We discuss the physical aspects on well log integration with seismic and time-lapse seismic characterization for CO₂ 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 CO₂ 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.