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Dynamics of CO2 Density‐Driven Flow in Carbonate Aquifers: Effects of Dispersion and Geochemistry
Water Resources Research ( IF 5.4 ) Pub Date : 2021-02-24 , DOI: 10.1029/2020wr027829
Hamidreza Erfani 1 , Masoud Babaei 1 , Vahid Niasar 1
Affiliation  

The dissolution of carbon‐dioxide (CO2) in deep saline aquifers is an important trapping mechanism in carbon storage. This process is triggered by unstable high‐density CO2 front, which later promotes density‐driven mixing, hydrodynamic dispersion of CO2, and favors the long‐term sequestration. In many former studies, effects of hydrodynamic dispersion and multispecies geochemical reactions have been ignored. This work elaborates the impacts of these simplifications on the dynamics of convective mixing by numerical simulations. Geochemical effects were studied by the implementation of rock‐fluid and fluid‐fluid interactions for a typical carbonate aquifer. Results show that accounting for the hydrodynamic dispersion decreases the convection onset time and increases the CO2 dissolution flux, which is more significant in larger dispersivities and Rayleigh numbers. Results indicate that carbonate geochemical reactions intense the long‐term overall efficiency of the process, while decrease the total amount of sequestered carbon in the diffusion‐dominated period. Results also reinforce the importance of realistic geochemical representation and importance of spatial and temporal dependence of the reactions pathway, subsequent to the finger development for more detailed simulation of the CO2 storage process.

中文翻译:

碳酸盐岩含水层中CO2密度驱动的流动动力学:扩散和地球化学的影响

二氧化碳(CO 2)在深层盐水中的溶解是碳储存中的重要捕集机制。此过程是由不稳定的高密度CO 2前沿触发的,该前沿随后促进了密度驱动的混合,CO 2的流体动力分散,并主张长期封存。在许多以前的研究中,流体动力扩散和多种地球化学反应的影响都被忽略了。这项工作通过数值模拟详细说明了这些简化对流混合动力学的影响。通过对典型的碳酸盐含水层实施岩石-流体和流体-流体相互作用,研究了地球化学效应。结果表明,考虑水动力分散会减少对流开始时间并增加CO 2溶解通量,在较大的分散度和瑞利数中更重要。结果表明,碳酸盐地球化学反应增强了该过程的长期总体效率,同时减少了以扩散为主的时期的固存碳总量。结果还增强了现实地球化学表示的重要性以及反应路径的时空依赖性的重要性,在手指展开以进行更详细的CO 2储存过程模拟之后。
更新日期:2021-04-08
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