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- Jerome A. Neufeld
- Institute of Theoretical Geophysics, Department of Applied Mathematics and Theoretical Physics University of Cambridge Cambridge UK
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- Marc A. Hesse
- Department of Geological Sciences University of Texas at Austin Austin Texas USA
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- Amir Riaz
- Department of Mechanical Engineering University of Maryland College Park Maryland USA
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- Mark A. Hallworth
- Institute of Theoretical Geophysics, Department of Applied Mathematics and Theoretical Physics University of Cambridge Cambridge UK
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- Hamdi A. Tchelepi
- Department of Energy Resources Engineering Stanford University Stanford California USA
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- Herbert E. Huppert
- Institute of Theoretical Geophysics, Department of Applied Mathematics and Theoretical Physics University of Cambridge Cambridge UK
説明
<jats:p>Geological carbon dioxide (CO<jats:sub>2</jats:sub>) storage is a means of reducing anthropogenic emissions. Dissolution of CO<jats:sub>2</jats:sub> into the brine, resulting in stable stratification, increases storage security. The dissolution rate is determined by convection in the brine driven by the increase of brine density with CO<jats:sub>2</jats:sub> saturation. We present a new analogue fluid system that reproduces the convective behaviour of CO<jats:sub>2</jats:sub>‐enriched brine. Laboratory experiments and high‐resolution numerical simulations show that the convective flux scales with the Rayleigh number to the 4/5 power, in contrast with a classical linear relationship. A scaling argument for the convective flux incorporating lateral diffusion from downwelling plumes explains this nonlinear relationship for the convective flux, provides a physical picture of high Rayleigh number convection in a porous medium, and predicts the CO<jats:sub>2</jats:sub> dissolution rates in CO<jats:sub>2</jats:sub> accumulations. These estimates of the dissolution rate show that convective dissolution can play an important role in enhancing storage security.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 37 (22), L22404-, 2010-11
American Geophysical Union (AGU)
