Time-lapse pre-stack seismic data registration and inversion for CO_2 sequestration study at Cranfield

摘要

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 CO_2 injection. We perform time-lapse pre-stack 3-D seismic data analysis for monitoring CO_2 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 CO_2 plumes.