Allan,M.M., Turner,A. and Yardley,B.W.D.(2011): Relation between the dissolution rates of single minerals and reservoir rocks in acidified pore waters. Applied Geochemistry, 26, 1289-1301.

『酸性化孔隙水での単鉱物の溶解速度と源岩の間の関係』


Abstract
 A series of kinetic experiments has been carried out to investigate the rates of dissolution (release of Al and Si) of common sandstone minerals in response to acidification of pore waters (pH = 3), using an experimental procedure designed to maximise the proportion of solid to fluid, and to minimise possible damage from agitation. The results have then been compared with those from experiments using disaggregated sandstones from two North Sea reservoirs. Experiments were carried out at 25℃ and 80℃ and in 0.01, 0.1 and 1 M NaCl solutions, with a pH of 3. Hydrochloric acid was used as the source of acidity and rate constants were determined based on both release of Al and Si. Mineral dissolution rates were closely comparable to literature values, despite the difference experimental technique, except in the case of smectite where particle aggregation appears to have inhibited reaction. The dissolution rates calculated for reservoir sandstones based on their modal mineralogy and surface areas agree with within a factor of 2 with the measured vales. Based on the reaction rates measured here, reservoir rocks rich in feldspar, illite and/or smectite are likely to react most rapidly with acidified pore waters.』

1. Introduction
2. Starting materials
 2.1. Minerals
 2.2. Reservoir rocks
  2.2.1. Beryl
  2.2.2. Huldra
3. Dissolution experiments
4. Mineral hydrolysis reactions
 4.1. Smectite (STx-1)
 4.2. Kaolinite (KGa 1-b)
 4.3. Illite (IMt-1)
 4.4. Albite (HR-108)
 4.5. Labradorite
5. Reaction rate calculations
6. Results
 6.1. Activation energies
7. SEM observations
8. Interpretation of mineral dissolution data
 8.1. Smectite
 8.2. Kaolinite
 8.3. Illite
 8.4. Albite
 8.5. Labradorite
9. Chemical affinity effects
10. Interpretation of sediment dissolution data
 10.1. Hudra
 10.2. Beryl
11. Implications for CO2 sequestration in silicate reservoirs
 11.1. Effect of salinity on reaction rate
 11.2. Clay vs. feldspar reaction rates
 11.3. Aluminosilicate vs. carbonate reaction rates
12. Conclusions
Acknowledgements
References


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