Surface Monitoring of Microseismicity at the Decatur, Illinois, CO₂ Sequestration Demonstration Site

Sequestration of CO₂ into subsurface reservoirs can play an important role in limiting future emission of CO₂ into the atmosphere (e.g., Benson and Cole, 2008). For geologic sequestration to become a viable option to reduce greenhouse gas emissions, large‐volume injection of supercritical CO₂ into deep sedimentary formations is required. These formations offer large pore volumes and good pore connectivity and are abundant (Bachu, 2003; U.S. Geological Survey Geologic Carbon Dioxide Storage Resources Assessment Team, 2013). However, hazards associated with injection of CO₂ into deep formations require evaluation before widespread sequestration can be...