Modelling chloride and CO{sub 2} chemistry at the Wairakei geothermal field, New Zealand

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The chloride and CO<sub>2</sub> chemistry at the Wairakei geothermal field, New Zealand has been modelled using an extended version of the geothermal simulator TOUGH2 which solves the equations for the transport of reacting chemical species in multi-phase fluids. Reactions involving the speciation of aqueous CO<sub>2</sub> to H<sub>2</sub>CO<sub>3</sub> and HCO<sub>3</sub><sup>-</sup>, are included in the model. Because CO<sub>2</sub> speciation in water is pH dependent, a reaction involving the most important weak acid buffer at Wairakei (H<sub>4</sub>SiO<sub>4</sub>) has also been included. A ‘Henry’s Law’ reaction expresses the equilibrium between the aqueous and vapour components of CO<sub>2</sub>. The chloride is treated as a conservative, ... continued below

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217-223

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Kissling, W. M.; White, S. P.; O'Sullivan, M. J.; Bullivant, D. P. & Brown, K. L. January 24, 1996.

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Description

The chloride and CO<sub>2</sub> chemistry at the Wairakei geothermal field, New Zealand has been modelled using an extended version of the geothermal simulator TOUGH2 which solves the equations for the transport of reacting chemical species in multi-phase fluids. Reactions involving the speciation of aqueous CO<sub>2</sub> to H<sub>2</sub>CO<sub>3</sub> and HCO<sub>3</sub><sup>-</sup>, are included in the model. Because CO<sub>2</sub> speciation in water is pH dependent, a reaction involving the most important weak acid buffer at Wairakei (H<sub>4</sub>SiO<sub>4</sub>) has also been included. A ‘Henry’s Law’ reaction expresses the equilibrium between the aqueous and vapour components of CO<sub>2</sub>. The chloride is treated as a conservative, non-reacting species which is present only in the liquid phase. Results from the model are compared with measured chloride and CO<sub>2</sub> data from Wairakei covering the period 1959 to 1987.

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217-223

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  • Proceedings, Twenty-First Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, CA, January 22-24, 1996

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  • Report No.: SGP-TR-151-31
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 889775
  • Archival Resource Key: ark:/67531/metadc884915

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 24, 1996

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  • Sept. 21, 2016, 2:29 a.m.

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  • Jan. 7, 2018, 7:13 p.m.

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Kissling, W. M.; White, S. P.; O'Sullivan, M. J.; Bullivant, D. P. & Brown, K. L. Modelling chloride and CO{sub 2} chemistry at the Wairakei geothermal field, New Zealand, article, January 24, 1996; Lower Hutt, New Zealand. (digital.library.unt.edu/ark:/67531/metadc884915/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.