--> Abstract: Suitability of Kentucky Reservoirs for Carbon Dioxide-Enhanced Oil Recovery and Sequestration, by K. G. Takacs, T. M. (Marty) Parris, and B. C. Nuttall; #90095 (2009)
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Suitability of Kentucky Reservoirs for Carbon Dioxide-Previous HitEnhancedNext Hit Previous HitOilNext Hit Previous HitRecoveryNext Hit and Sequestration

Kathryn G. Takacs, Thomas M. (Marty) Parris, and Brandon C. Nuttall
Kentucky Geological Survey, University of Kentucky, Lexington, KY 40506 [email protected], [email protected], [email protected]

Seventy reservoirs in 51 Previous HitoilNext Hit fields in the Appalachian and Illinois Basins, and the Cincinnati Arch of Kentucky, were evaluated for carbon dioxide-Previous HitenhancedNext Hit Previous HitoilNext Hit Previous HitrecoveryNext Hit (CO2- EOR) and sequestration. We first examined the relationship between initial reservoir pressure, fracture pressure, and minimum miscibility pressure, which was calculated using the Cronquist correlation. This analysis, done to determine the extent reservoirs could be repressurized during Previous HitenhancedNext Hit Previous HitoilNext Hit Previous HitrecoveryNext Hit, showed that initial pressure is less than minimum miscibility pressure for 92 percent of reservoirs, and therefore immiscible conditions would likely prevail. Immiscibility would result in less added production than miscible conditions.

The fields were further analyzed and ranked into quartiles using a combination of measured (e.g., porosity, permeability) and calculated (CO2 storage density and volume) reservoir parameters. The parameters permeability times pay thickness (k X h), and CO2 storage density, measured in tons per acre-feet, had considerable influence on which reservoirs placed in the upper quartile (i.e. more positive for CO2-EOR). The 50th percentile (Q50) values for both parameters tend to have significantly higher values in the first quartile versus quartiles 2-4: (k X h), Q150 = 4,944, Q2-450 = 1,347; CO2 storage density, Q150 = 562, Q2-450 = 112. Other parameters analyzed (initial Previous HitoilNext Hit saturation X porosity, API gravity) did not have as significant an impact on placing fields into the upper quartile. This analysis underscores the importance of injectivity, as described by the product k X h, and CO2 storage density as important parameters influencing Previous HitenhancedNext Hit Previous HitoilNext Hit Previous HitrecoveryTop-sequestration projects.

 

AAPG Search and Discovery Article #90095©2009 AAPG Eastern Section Meeting, Evansville, Indiana, September 20-22, 2009