Date of Graduation

Spring 2012

Degree

Master of Science in Chemistry

Department

Chemistry

Committee Chair

Richard Biagioni

Keywords

Geochemist Work Bench, carbon sequestration, LaMotte Formation, solubility trapping, mineral trapping, tracer, sulfur hexafluoride

Subject Categories

Chemistry

Abstract

Various geochemical reactions that can occur upon CO2 injection into a sandstone formation in Missouri (MO) have been determined. The Geochemist's Workbench modeling program was used to simulate solubility trapping and mineral precipitation storage mechanisms during CO2 geo-sequestration. Modeling was completed for two periods: injection period (10 years) and post injection period (until equilibrium). The amount of CO2 stored via solubility trapping ranged from 57 g/kg of free formation water (northeast MO) to 88 g CO2/kg of free formation water (southwest MO) for fresh water of Greene County. Similarly, CO2 stored via mineral trapping ranged from 2 g CO2/kg of free formation water (northeast MO) to 12 g CO2/kg of free formation water (southwest MO). Major mineral contributions to CO2 storage were due to precipitation of siderite and dawsonite. Dawsonite becomes very important during long-term sequestration. Studies to quantify the lowest detectable concentrations of a geological tracer, sulfur hexafluoride (SF6) were also carried out. The lowest detected concentration of SF6 was 4.8 parts per trillion.

Copyright

© Nelson Kipngetich Rono

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