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Injection of CO2-saturated water through a siliceous sandstone plug from the Hontomin Test Site (Spain): experiment and modeling

Canal, J.; Delgado, J.; Falcon, I.; Yang, Q.; Juncosa, R.; Barrientos, V.. 2013 Injection of CO2-saturated water through a siliceous sandstone plug from the Hontomin Test Site (Spain): experiment and modeling. Environmental Science & Technology, 47 (1). 159-167. https://doi.org/10.1021/es3012222

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Abstract/Summary

Massive chemical reactions are not expected when injecting CO2 in siliceous sandstone reservoirs, but their performance can be challenged by small-scale reactions and other processes affecting their transport properties. We have conducted a core flooding test with a quartzarenite plug of Lower Cretaceous age representative of the secondary reservoir of the Hontomín test site. The sample, confined at high pressure, was successively injected with DIW and CO2-saturated DIW for 49 days while monitoring geophysical, chemical, and hydrodynamic parameters. The plug experienced little change, without evidence of secondary carbonation. However, permeability increased by a factor of 4 (0.022–0.085 mD), and the VP/VS ratio, whose change is related with microcracking, rose from ?1.68 to ?1.8. Porosity also increased (7.33–8.1%) from the beginning to the end of the experiment. Fluid/rock reactions were modeled with PHREEQC-2, and they are dominated by the dissolution of Mg-calcite. Mass balances show that ?4% of the initial carbonate was consumed. The results suggest that mineral dissolution and microcracking may have acted in a synergistic way at the beginning of the acidic flooding. However, dissolution processes concentrated in pore throats can better explain the permeability enhancement observed over longer periods of time.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1021/es3012222
ISSN: 0013-936X
Date made live: 15 Jul 2016 14:22 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/513974

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