Convective dissolution of carbon dioxide in saline aquifers

Jerome Neufeld, Marc Hesse, Amir Riaz, MA Hallworth, Hamdi Tchelepi, Herbert E Huppert

Research output: Contribution to journalArticle (Academic Journal)peer-review

223 Citations (Scopus)

Abstract

Geological carbon dioxide (CO2) storage is a means of reducing anthropogenic emissions. Dissolution of CO2 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 CO2 saturation. We present a new analogue fluid system that reproduces the convective behaviour of CO2-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 CO2 dissolution rates in CO2 accumulations. These estimates of the dissolution rate show that convective dissolution can play an important role in enhancing storage security.

Original languageEnglish
Article number L22404
Number of pages5
JournalGeophysical Research Letters
Volume37
Issue number22
DOIs
Publication statusPublished - 2010

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