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Abstract
After CO2 is injected into the saline aquifer, the formation water inside the porous media becomes more acidic. This will significantly affect the original chemical equilibrium underground, and induce or speed up various processes of dissolution and precipitation depending on the reservoir pressure, temperature and salinity of formation water. The Early Cretaceous Gage Sandstone has been identified as a potential reservoir unit suitable for large-scale CO2 storage in the offshore southern Perth Basin. This study assesses the contribution of mineralisation trapping to CO2 storage capacity of the Gage Sandstone through a comprehensive geochemical modelling. Analyses of mineral assemblages in reservoir rocks and properties of formation water were used to assess dissolutions of unstable components under an acidic environment such as potassium-feldspar, plagioclase and carbonate, and the precipitation of calcite and kaolinite, which are considered to be the main water-rock interactions during the post-injection period. The chemical reaction was treated as a function of time. Three software packages were used to run the geochemical reaction simulation to ascertain the practical capabilities of predicting the effects of CO2 injection underground and the storage potential of the Gage Sandstone reservoir. Sensitivity analysis was carried out using different: 1) equations of state, 2) methods for solubility modelling, 3) models of activity coefficient estimation, 4) time scales, and 5) assemblages of minerals in the Gage Sandstone. This study analysed the effects of CO2 injection on reservoir porosity and permeability together with the geochemical modelling.
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nonGeographicDataset
eCat Id
74377
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
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- External Publication
- ( Theme )
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- marine
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2012-07-06T00:00:00
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