Convective dissolution of carbon dioxide in saline aquifers
Convective dissolution of carbon dioxide in saline aquifers
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DOI：
10.1029/2010gl044728
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发表时间：
2010-11-24
影响因子：
5.2
通讯作者：
Huppert, Herbert E.
中科院分区：
文献类型：
--
作者：
Neufeld, Jerome A.;Hesse, Marc A.;Huppert, Herbert E.
二氧化碳（CO2）地质封存是减少人为排放的一种手段。CO2溶解到盐水中，导致稳定的分层，提高了储存安全性。溶解速率由盐水中的对流决定，该对流由盐水密度随CO2饱和度的增加而驱动。我们提出了一种新的模拟流体系统，再现了富CO2盐水的对流行为。实验室实验和高分辨率数值模拟表明，对流通量与瑞利数的4/5次方成比例，与经典的线性关系相反。对流通量的尺度参数结合横向扩散从下降羽解释了这种非线性关系的对流通量，提供了一个物理图像的高瑞利数对流在多孔介质中，并预测CO2的溶解速率在CO2积累。这些估计的溶解速率表明，对流溶解可以发挥重要作用，提高存储安全。引文：Neufeld，J.A.，M. A.黑森，A. Riaz，M. A. Hallworth，H. A. Tchelepi和H. E. Huppert（2010年），盐水层中二氧化碳的对流溶解，地球物理学。保留信函：37，L22404，doi：10.1029/2010GL044728。
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. Citation: Neufeld, J. A., M. A. Hesse, A. Riaz, M. A. Hallworth, H. A. Tchelepi, and H. E. Huppert (2010), Convective dissolution of carbon dioxide in saline aquifers, Geophys. Res. Lett., 37, L22404, doi: 10.1029/2010GL044728.