Abstract
This paper describes passive seismic monitoring at the large-scale CO2 injection site, Cranfield oilfield, Mississippi, U.S.A. We constructed a horizontal near-surface monitoring network and have been monitoring for more than two years to elucidate relationship between large-volume CO2 injection and occurrences of induced seismicities. We have detected no microseismic events that occurred in and around the Cranfield site for now. The detected signals were all identified as cultural noises, natural noises due to weather changes, and distant earthquakes. We also estimated minimum detectable magnitudes of the monitoring network by theoretical calculations and confirmed that the system could enough ability to detect microseismic events.
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