Geologicalsequestration of carbon dioxide in deep reservoirs may provide alarge-scale option for reducing the emissions of this gas intothe atmosphere. The effectiveness of sequestration depends on the storagecapacity and stability of the reservoir and risk of leakageinto the overburden. Reservoir rocks can react with a CO2-watermixture, potentially resulting in the precipitation of minerals in theavailable matrix pore space and within pre-existing fractures. This inducedmineralization may form internal seals that could help mitigate theleakage of CO2 into the overburden. For basaltic host rocks,carbonic acid partially dissolves minerals in the host rock, suchas the calcium plagioclase mineral, freeing various cations (e.g., Ca2+and Mg2+) for later precipitation as carbonate cements (Gislason etal., 2010).
This document was originally published by Society of Exploration Geophysicists in The Leading Edge. Copyright restrictions may apply. DOI: 10.1190/1.3672479
Otheim, Thomas L.; Adam, Ludmila; van Wijk, Kasper; Batzle, Michael L.; McLing, Travis; and Podgorney, Robert. (2011). "CO2 Sequestration in Basalt: Carbonate Mineralization and Fluid Substitution". The Leading Edge, 30(12), 1354-1359. http://dx.doi.org/10.1190/1.3672479