Multidimensional reactive transport modeling of CO2 mineral sequestration in basalts at the Hellisheidi geothermal field, Iceland.
Description
Two and three-dimensional field scale reservoir models of CO2 mineral sequestration in basalts were
developed and calibrated against a large set of field data. Resulting principal hydrological properties are
lateral and vertical intrinsic permeabilities of 300 and 1700
×
10−15m2, respectively, effective matrix
porosity of 8.5% and a 25 m/year estimate for regional groundwater flow velocity.
Reactive chemistry was coupled to calibrated models and predictive mass transport and reactive transport
simulations carried out for both a 1200-tonnes pilot CO2 injection and a full-scale 400,000-tonnes
CO2 injection scenario. Reactive transport simulations of the pilot injection predict 100% CO2 mineral
capture within 10 years and cumulative fixation per unit surface area of 5000 tonnes/km2. Corresponding
values for the full-scale scenario are 80% CO2 mineral capture after 100 years and cumulative fixation
of 35,000 tonnes/km2. CO2 sequestration rate is predicted to range between 1200 and 22,000 tonnes/year
in both scenarios.
The predictive value of mass transport simulations was found to be considerably lower than that of
reactive transport simulations. Results from three-dimensional simulations were also in significantly
better agreement with field observations than equivalent two-dimensional results.
Despite only being indicative, it is concluded from this study that fresh basalts may comprise ideal
geological CO2 storage formations.
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Edda_Sif_Pind_Aradottir_Multidimensional_reactive_transport_modeling_of_CO2_mineral_sequestration_in_basalts.pdf
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