The Illinois State Geological Survey (ISGS) conducted an evaluation of the carbon storage potential of the Cambro-Ordovician Strata of the Illinois and Michigan Basins, which underlie much of the states of Illinois, Indiana, Kentucky, and Michigan. Whole core of the Knox and Maquoketa Shale were taken from several wells drilled for the Midwest Geological Sequestration Consortium field test and the Industrial Carbon Capture and Storage demonstration project in Decatur, Illinois. Additionally, 120 miles of 2-D seismic data were acquired in western Illinois to enhance the characterization of the Illinois Basin. A small-volume carbon dioxide (CO2) injection test was also conducted in Hancock County, Kentucky to evaluate the injectivity of the Knox. These data and other available data were used to estimate the regional injectivity and storage capacity of the Knox Super Group and the St. Peter Sandstone. Specific studies included modeling the dissolution of CO2 in brine and the interaction with carbonate reservoir rocks, geomechanical tests and petrophysical analyses, an evaluation of mineralization rates, and an analysis of seal faulting potential.
The overall effort provides greater insight into the potential for geologic formations across the United States to safely and permanently store CO2. The results of this project contribute towards DOE’s on-going assessment of the national CO2 storage resources in deep geologic formations. The geologic intervals evaluated in this project provide new opportunities for geologic storage in southern Illinois, southern Indiana, Michigan, and western Kentucky. The project also confirmed the upper Knox and Maquoketa shale as secondary confining zones for the Mt. Simon. The project’s contribution to the Best Practices Manual for site characterization is helping to reduce risks to the geologic storage of CO2 by documenting the uncertainties related to fracturing, injectivity, and geochemical interactions for these specific formations. The data gathered as part of this research effort is being shared with the Regional Carbon Sequestration Partnership’s (RCSP) MGSC, integrated into NATCARB, and utilized for the Carbon Sequestration Atlas of the United States and Canada.
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