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Abstract

Summary

In a pilot project in Helguvik, Iceland, in-situ CO mineral storage is tested for the first time using saline water instead of fresh water for injection in the field scale. We present three geophysical and geochemical techniques that are novel to in-situ CO mineral storage site characterization and monitoring. The baseline characterization, employing single-hole electrical resistivity tomography (ERT) and crosshole seismic measurements, revealed decameter-thick basaltic layers and allowed us to interfer the subsurface porosity and permeability distributions. Rock physics modelling predicts significant seismic velocity increases associated with secondary mineral precipitation, suggesting crosshole seismic time-lapse surveys as a valuable monitoring tool. Results of the ERT timelapse measurements show distinct variations between the baseline and the timelapse measurements, indicating potential resistivity changes due to secondary mineral precipitation and fluid substitution. Geochemical monitoring of a Helium tracer confirms that injected water has reached the monitoring well at 100 m distance, whereas the CO concentration in the same well shows no significant increase relative to the pre-injection state. This work demonstrates the potential of combined geophysical and geochemical methods for characterizing and monitoring in-situ CO mineral storage, highlighting ERT and crosshole seismics as valuable tools.

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2025-09-01
2026-02-14

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References

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/content/papers/10.3997/2214-4609.202522030
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Geophysical and Geochemical Methods for In-situ CO2 Mineral Storage Site Characterization and Monitoring
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202522030
/content/papers/10.3997/2214-4609.202522030
/content/papers/10.3997/2214-4609.202522030
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