Characterization of the Mt. Simon Sandstone in Southwest Ohio for CO2 Sequestration
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. School of Earth Sciences Senior Theses; 2012
CO2 sequestration in deep subsurface environments has been proposed as an innovative strategy to lessen the impact of burning fossil fuels on Earth’s atmosphere. In order for CO2 sequestration to be effective, the target formation must have sufficient porosity, permeability, depth and thickness to store CO2. The Mt. Simon Sandstone, a Cambrian arenite to arkosic sandstone in western Ohio may provide appropriate physical and mineralogical properties for effective CO2 sequestration. The goal of this research is to evaluate the Mt. Simon sandstone’s volumetric capacities including connected porosity, pore size and pore volume, as well as to determine mineralogy and digenetic processes, to assess the formation’s suitability for CO2 sequestration. Samples and measurements were performed on the ODGS 2627 Warren well, and on the ODGS 2843 Armco well to evaluate spatial continuity and vertical heterogeneity. Porosity and pore size distribution measurements were determined using mercury porosimetry and BET gas sorption. Grain size measurements were determined through the use of light microscopy. Results show a porosity range of 1-25%, a connected pore size range of 5-1612 nm, and a decrease in grain size from the base of the Mt. Simon Sandstone through the overlying Eau Claire Formation. Variations in porosity and pore size show that the formation is heterogeneous, changing substantially on a macro scale. Changes in grain size are representative of a transgressive depositional system. Mineralogical characterization of the target Mt. Simon Sandstone and surrounding formations used powder X-ray diffraction, SEM, and polarized light microscopy to show lithologic variations from arenite to feldspathic sandstone, with cementation that included quartz, illite, chlorite, carbonate, iron and titanium oxides, and iron sulfides. Results show heterogeneity in each formation that occurs laterally. Comparison of lithology and pore space reveals that mineralogy and diagenetic processes are the main factors controlling available pore space, and that clean quartz arenite provide the greatest porosity. CO2 storage calculations show that the Warren well location could hold up to 61.0 million metric tons, however this would not provide enough storage space to sustain a long term coal fire power plant.
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