(91a) CO2/Brine/Rock Interactions Under CO2 Sequestration Conditions
- Conference: AIChE Spring Meeting and Global Congress on Process Safety
- Year: 2016
- Proceeding: 2016 AIChE Spring Meeting and 12th Global Congress on Process Safety
- Group: Emerging Technologies in Clean Energy
- Time: Tuesday, April 12, 2016 - 10:15am-10:45am
An experimental study of the interaction of CO2/brine/rock on saline formations in a static system under CO2 sequestration conditions was conducted. Chemical interactions in the cores samples from Lower Tuscaloosa Formation upon exposure to CO2 mixed with brine under sequestration conditions for six months were studied. The experimental parameters used were core samples of Lower Tuscaloosa Massive Sand and Selma Chalk from Jackson County, Mississippi; Tuscaloosa Basin model brine; temperature of 85 °C, pressure of 23.8 MPa (3,500 psig), and CO2. CT, XRD, SEM, petrography, and brine, porosity, and permeability analyses were performed before and after the exposure. Preliminary permeability measurements observed from the Massive Sand core sample showed a change after it was exposed to CO2-saturated brine for six months. This observation suggests that mineral dissolution and mineral precipitation could occur in the host deposit altering its characteristics for CO2 storage over time. No significant change of the permeability measurements was noticed for the core sample obtained from Selma Chalk after it was exposed to CO2/brine for six months.