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

Injection of CO2-saturated water through a siliceous sandstone plug from the Hontomin Test Site (Spain): experiment and modeling
Injection of CO2-saturated water through a siliceous sandstone plug from the Hontomin Test Site (Spain): experiment and modeling
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.
0013-936X
159-167
Canal, J.
17458784-cd9e-4bd2-abaf-fd7774e8014a
Delgado, J.
d7dfd1cb-d8cf-49ba-80c4-0dff994d6eb1
Falcón, I.
8aa18ca3-e195-4558-871d-3884dd82be89
Yang, Q.
af957345-3af4-442b-a6d9-c032b63bb377
Juncosa, R.
f19e8e12-3861-4bb0-9b3b-1522c8ff97e5
Barrientos, V.
d802cc5b-5018-4da3-96c5-bd5c977eb911
Canal, J.
17458784-cd9e-4bd2-abaf-fd7774e8014a
Delgado, J.
d7dfd1cb-d8cf-49ba-80c4-0dff994d6eb1
Falcón, I.
8aa18ca3-e195-4558-871d-3884dd82be89
Yang, Q.
af957345-3af4-442b-a6d9-c032b63bb377
Juncosa, R.
f19e8e12-3861-4bb0-9b3b-1522c8ff97e5
Barrientos, V.
d802cc5b-5018-4da3-96c5-bd5c977eb911

Canal, J., Delgado, J., Falcón, I., Yang, Q., Juncosa, R. and 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. (doi:10.1021/es3012222).

Record type: Article

Abstract

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.

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Published date: 2013
Organisations: Marine Geoscience

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Local EPrints ID: 398072
URI: http://eprints.soton.ac.uk/id/eprint/398072
ISSN: 0013-936X
PURE UUID: b0ec9fa8-cfa2-4948-9851-7a5afd6c2932

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Date deposited: 15 Jul 2016 14:19
Last modified: 15 Mar 2024 01:28

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Contributors

Author: J. Canal
Author: J. Delgado
Author: I. Falcón
Author: Q. Yang
Author: R. Juncosa
Author: V. Barrientos

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