Time-lapse pre-stack seismic data registration and inversion for CO₂ sequestration study at Cranfield

Pre-stack seismic data are indicative of subsurface elastic properties within the amplitude versus offset characteristic and can be used to detect elastic rock property changes caused by CO2 injection. We perform time-lapse pre-stack 3-D seismic data analysis for monitoring CO2 sequestration at Cranfield. The time-lapse amplitude differences of Cranfield datasets are found entangled with time-shifts. To disentangle these two characters, we apply a local-correlation-based warping method to register the time-lapse pre-stack datasets, which can effectively separate the time-shift from the time-lapse seismic amplitude difference without changing the original amplitudes. We demonstrate the effectiveness of our registration method by evaluating the inverted elastic properties. These inverted time-lapse elastic properties can be reliably used for monitoring CO2 plumes.