Geophysical testing has been used to monitor CO2 injection into a test well in the Citronelle Oil Field in Alabama. The Citronelle Oil Field is the largest oil producer in Alabama and is currently in the tertiary oil production stage. This research is part of a project to evaluate the Rodessa Formation (depth at 11,500 ft) for its potential to recover additional oil through enhanced oil recovery (EOR) using CO2, as well as its CO2 sequestration potential. A total of 15,000 tons of CO2 will be injected. The goal of the Geophysical testing is to determine if seismic measurements are capable of detecting changes in the geologic formation and the migration of CO2 during and after the injection. A Derivative of Refractive Microtremor (DoReMi) method using wireless sensor has been used for the Geophysical testing. The success of the Geophysical testing in monitoring CO2 migration in the oil field can help prevent possible leakage of CO2 back into the atmosphere, hence reduce its environmental impacts, which may have significant implications in reducing greenhouse effects. Monitoring results, before and during injections, show possible correlation to the stressing of the oil field strata during CO2 injection.
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