Geologic storage of carbon dioxide (CO2) has long been considered an important component of greenhouse gas emissions mitigation (Pacala and Socolow, 2004). Industry experience with CO2 injection for enhanced oil recovery (EOR) (since the 1970s) and CO2 storage in saline formations (since 1996) has produced a strong foundation of knowledge for improving and refining CO2 storage technology. There are many technical challenges at geologic storage sites that require geophysical measurements and monitoring. These challenges include initial site assessment; assuring that injectivity and capacity predictions are reliable; confirming that the fate and configuration of the CO2 plume is acceptable; and that regulatory permitting and compliance is accomplished in a timely manner (e.g., CSFL, 2013; Dixon and Romanak, 2015).

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