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| | 講演要旨(英文) | | Time-lapse studies of the physical state of the injection zones or fractured zones are key components for the Carbon-Capture-and-Storage (CCS), CO2-EOR and shale-gas productions. Monitoring systems using the seismic-ACROSS (Accurately Controlled, Routinely Operated Signal System) source can be one of the most suitable methods for these purposes. We have made simulations assuming an ACROSS-source and a multi-seismic receiver array that are installed at the Ketzin pilot site for CO2 storage in Germany. At Ketzin, CO2 has been injected since July, 2008. About 62,000 tons of super-critical CO2 have been injected to date at about 630-650 m depth and injection will continue into 2013. How the injected CO2 behaves after injection is extremely important for studying the long term behavior of a storage site. The objectives of this study are to find the most suitable location for an ACROSS-source and receivers at the Ketzin site. Preliminary results using the velocity and density structure site model shows that a rectangular injection zone, 200 m wide and 10m thick at 665m depth, is well imaged. This result encourages us to plan for using an ACROSS source for time-lapse studies to monitor the migration of injected CO2 at Ketzin, even after injection has finished. |
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