Time‐lapse pre‐stack seismic data registration and inversion for CO2 sequestration study at Cranfield |
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| Authors: | Rui Zhang Xiaolei Song Sergey Fomel Mrinal K Sen Sanjay Srinivasan |
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| Affiliation: | 1. Lawrence Berkeley National Laboratory, work done at The University of Texas at Austin;2. The University of Texas at Austin, now at BP;3. Bureau of Economic Geology, The University of Texas at Austin;4. Institute for Geophysics, The University of Texas at Austin and National Geophysical Research Institute, , Hyderabad, India;5. Department of Petroleum and Geosystems Engineering, The University of Texas at Austin |
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| Abstract: | 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  injection. We perform time‐lapse pre‐stack 3‐D seismic data analysis for monitoring  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  plumes. |
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