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Abstract

DOI:10.1306/13331531M983062

Ordovician Knox Carbonates and Sandstones of the Eastern Mid-continent: Potential Geologic Carbon Storage Reservoirs and Seals

Stephen F. Greb,1 J. Richard Bowersox,2 Michael P. Solis,3 David C. Harris,4 Ronald A. Riley,5 John A. Rupp,6 Previous HitMarkTop Kelley,7 Neeraj Gupta8

1Kentucky Geological Survey, University of Kentucky, Lexington, Kentucky, U.S.A.
2Kentucky Geological Survey, University of Kentucky, Lexington, Kentucky, U.S.A.
3Kentucky Geological Survey, University of Kentucky, Lexington, Kentucky, U.S.A.
4Kentucky Geological Survey, University of Kentucky, Lexington, Kentucky, U.S.A.
5Ohio Division of Geological Survey, Ohio Department of Natural Resources, Columbus, Ohio, U.S.A.
6Indiana Geological Survey, University of Indiana, Bloomington, Indiana, U.S.A.
7Battelle Memorial Institute, Columbus, Ohio, U.S.A.
8Battelle Memorial Institute, Columbus, Ohio, U.S.A.

ACKNOWLEDGMENTS

Data used in this investigation were made available through ongoing U.S. Department of Energy (U.S. DOE) and state-administered carbon sequestration programs, including the Midwest Regional Carbon Sequestration Partnership. The Battelle 1 Duke Energy well was managed by Battelle with funding from the U.S. DOE, Battelle, and others. The Battelle-American Electric Power (AEP) 1 Mountaineer well was managed by AEP and Battelle with funding from the U.S. DOE, AEP, British Petroleum, the Ohio Coal Development Office, Battelle, Schlumberger, and others. The Kentucky Geological Survey (KGS) 1 Marvin Blan well was mandated by Kentucky's House Bill 1, August 2007, and managed by KGS and the Kentucky Consortium for Carbon Storage with funding provided by Peabody Energy, ConocoPhillips, Inc., E.ON U.S., the Tennessee Valley Authority, the Illinois Office of Coal Development, and the U.S. DOE National Energy Technology Laboratory. The Ohio Geological Survey (OGS) 1 CO2 well was managed by Battelle with geologic assistance from the OGS through funding by the state's general revenue fund and the Ohio Coal Development Office Clean Coal Research funds. We thank the many individuals and corporations that have aided in the drilling and testing of these wells. We also thank David Barnes, Western Michigan University, and Robert Loucks, University of Texas at Austin, for their helpful reviews.

ABSTRACT

In response to rising concerns about atmospheric carbon dioxide (CO2) levels and likely regulations on emissions, investigations into geologic carbon storage options across the United States are underway. In the Midwest, Cambrian sandstones are major targets for potential geologic carbon storage. In some localities, the overlying Cambrian–Ordovician Knox Group is also being investigated as a possible target for primary and secondary storage of CO2. The thick dolomitic succession contains intervals that may function as both reservoirs and seals.

Gas storage fields in Knox carbonates in Kentucky and Indiana demonstrate that methane can be safely stored in paleotopographic highs along the Knox unconformity surface. Numerous injection wells have also been completed in the Knox Group for brine disposal. More significantly, at least seven class 1 injection wells have used the Knox as all or part of a storage reservoir for industrial wastes. Many of these wells have injected millions of gallons of liquid waste annually into Knox reservoirs. The relative scale of these injection operations can be used to estimate the types and sizes of potential reservoirs within the Knox succession in the Midwest.

Specific data on the Knox interval relative to its carbon storage and confining potential are currently being collected from wells drilled as part of U.S. Department of Energy administered carbon storage projects, as well as state-administered carbon storage programs. In this chapter, initial results of carbon storage tests are summarized from the Battelle 1 Duke Energy well, Kentucky Geological Survey 1 Blan well, Battelle-American Electric Power (AEP) 1 Mountaineer well, and Battelle-Ohio Geological Survey 1 CO2 well. The AEP Mountaineer Power Plant will host the nation's first commercially integrated carbon capture and geologic storage project, and the storage reservoirs will be in the Knox Group. Because the Knox Group is widespread at depth across much of the Midwest, it will be an important part of sequestration programs as confining interval and reservoir.

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