1887
PDF

Abstract

Summary

The kinetics of dolomite dissolution have been investigated in experiments conducted at conditions characteristic of the Rotliegend gas fields in the northeast of the Netherlands (Temperature 100 oC, Brine ionic strength I>6.4M, pH=2–5). Experiments were performed in closed, stirred, batch reactors at far from equilibrium conditions, with dolomite powders of different diameter fractions: 20–25 microns, 75–100 microns, and 300–350 microns, with respective geometric surface areas: 935cm2/g, 225 cm2/g and 65 cm2/g. Dissolution experiments were also conducted in deionized water for the largest grain size to determine the effect of solution composition on dolomite kinetics. The rates were deduced from the change in the amount of Mg2+ released in brine with time and were normalized by the surface area of the minerals at each time interval.

Dolomite dissolution rates were faster in brine than in deionized water by almost a factor of 2, which was not anticipated in such high salinity brine. Ionic strength and ion pairing overshadow the common ion effect, thus enhancing dissolution. In this work, smaller grains exhibited faster rates after normalization for surface area.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201414270
2015-10-13
2024-04-28
Loading full text...

Full text loading...

/deliver/fulltext/2214-4609/2015/We_Ses_09.html?itemId=/content/papers/10.3997/2214-4609.201414270&mimeType=html&fmt=ahah

References

  1. Allen, D.J. and Brent, J.F.
    [2010] Sequestering CO2 by mineral carbonation: Stability against acid rain exposure. Environmental Science & Technology, 44(7), 2735–9.
    [Google Scholar]
  2. Bachu, S. and AdamsJ.J.
    [2003] Sequestration of CO2 in geological media in response to climate change: Capacity of deep saline aquifers to sequester CO2 in solution. Energy Conversion and Management, 44(20), 3151–75.
    [Google Scholar]
  3. Bolourinejad, P., Omrani, P.S. and Herber, R.
    [2014] Effect of reactive surface area of minerals on mineralization and carbon dioxide trapping in a depleted gas reservoir. International Journal of Greenhouse Gas Control, 21, 11–22.
    [Google Scholar]
  4. Bundschuh, J. and Zilberbrand, M.
    [2011] Geochemical modeling of groundwater, vadose and geothermal systems. CRC Press.
    [Google Scholar]
  5. Gledhill, D.K. and Morse, J.W.
    [2006] Calcite dissolution kinetics in Na-Ca-Mg-Cl brines. Geochimica Et Cosmochimica Acta, 70(23), 5802–5813.
    [Google Scholar]
  6. Johnson, J.W., Nitao, J.J. and Knauss, K.G.
    [2004] Reactive transport modeling of CO2 storage in saline aquifers to elucidate fundamental processes, trapping mechanisms and sequestration partitioning. Geological Storage of Carbon Dioxide, 233, 107–128.
    [Google Scholar]
  7. Lackner, K.S. and Brennan, S.
    [2009] Envisioning carbon capture and storage: Expanded possibilities due to air capture, leakage insurance, and C-14 monitoring. Climatic Change, 96(3), 357–78.
    [Google Scholar]
  8. Pokrovsky, O.S., Golubev, S.V. and Schott, J.
    [2005] Dissolution kinetics of calcite, dolomite and magnesite at 25° C and 0 to 50 atm p CO2. Chemical Geology, 217(3), 239–55.
    [Google Scholar]
  9. Zhang, R., Hu, S., Zhang, X. and Yu, W.
    [2007] Dissolution kinetics of dolomite in water at elevated temperatures. Aquatic Geochemistry, 13(4), 309–38.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201414270
Loading
/content/papers/10.3997/2214-4609.201414270
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error