storage capacity

injection wells

deep saline

geological formations

International journal of greenhouse gas control

• Conceptual model of the subsurface flow processes at the Carbfix Demonstration site. • Field scale model including hydraulic gradients imposed by far-field injection and production wells. • Reproduce the results of field tracer tests at the CarbFix2 project and estimate the fraction of mineralized CO 2 using a non-reactive simulation scheme. The approach described here evaluate the deficiency in measured DIC against the simulated tracer concentrationprovided by the transport model. • Long-term forecast of fluid injection on the maximum size of the storage reservoir and electricity generation potential. The Carbfix 2 project was developed to demonstrate the cost effectiveness and technical maturity of CO 2 and H 2 S direct capture from emission sources and permanent geological storage by in-situ mineralization in basalts. CO 2 and H 2 S emissions of the Hellisheiði Geothermal Power Plant are separated from the other non condensable gases and captured by water dissolution. It is then transported to an injection well where it is co-injected with geothermal brine from the power station. The injection takes place in the Húsmúli re-injection area also known as the Carbfix demonstration site and has been an integral part of the operations of the power station since 2014. Field scale three-dimensional transport models of the injection at Húsmúli are developed to characterize the storage reservoir and constrain the flow paths between the Carbfix re-injection site and the nearby Skarðsmýrarfjall production zone. The model shows a good match to the tracer recovery and enthalpy from the monitoring wells and suggests a strong structural control at Húsmúli associated with faults acting as preferential pathways for the fluid. Implementation of boron, calcium, CO 2 , and H 2 S as solutes in the transport model and comparison between the modelled and the measured concentrations in the samples from the monitoring wells allows to assess the conservative and reactive behavior of each solute. By comparing expected (modelled) and me...

Carbfix 2: A transport model of long-term CO2 and H2S injection into basaltic rocks at Hellisheidi, SW-Iceland