- Geologic carbon sequestration is being considered in target basalt and sandstone formations. The chemical
effects of CO2 exposure on the interface between Class H Portland cement paste and Grande Ronde
Columbia River basalt, or between cement paste and Mt. Simon sandstone, has been examined at a
microstructural level. This bonding interface is a potential leakage pathway for CO2 along a wellbore.
The salinities of the formation solutions, basaltic Pasco Basin formation water (0.013 M), whereas the
sandstone Illinois Basin brine (1.28 M), play a large role in CO2 solubility and cement alteration. Experimental
cement-rock-fluid charges were held at 35 ◦C and PCO2
10 MPa for up to 84 days, conditions
under which the fluids are CO2-saturated. The basalt-cement experiment had
∼1 mm alteration at the
interface and high levels of alteration of the cement paste exterior. The sandstone sample displayed less
alteration at the cement paste interface. Geochemical modeling conducted with CHIM-XPT calculated
the pH of the Pasco brine solution (basalt only) to be 12.23 with 50 g of CO2 (104 bar) and 161 g (306 bar).
The pH of the Pasco solution (cement + basalt) started with at 11.82 and ended at 4.52 after 136 g of
CO2(g) dissolved in solution, resulting in the precipitation of magnesite, calcite, and siderite. The basalt
has high capacity to convert CO2 into minerals. The Illinois Basin brine containing Mt. Simon sandstone
and cement paste never exceeded a pH of 5.8, had an estimated 139 g of CO2 with high capacity to store
aqueous and brine-saturated CO2 and a lower risk of alteration to hardened cement paste.
- Verba, C., O’Connor, W., Rush, G., Palandri, J., Reed, M., & Ideker, J. (2014). Geochemical alteration of simulated wellbores of CO₂ injection sites within the Illinois and Pasco Basins. International Journal of Greenhouse Gas Control, 23, 119-134. doi:10.1016/j.ijggc.2014.01.015
|Funding Statement (additional comments about funding)
- This work was supported by the Carbon Sequestration Program of the U.S. DOE National Energy Technology Laboratory. This report was prepared as an account of work sponsored by an agency of the United Sates Government.
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