Modeling CO2 Storage in Aquifers with a Fully-Coupled Geochemical EOS Compositional Simulator
Modeling CO2 Storage in Aquifers with a Fully-Coupled Geochemical EOS Compositional Simulator
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DOI：
10.2118/89474-ms
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发表时间：
2004
期刊：
影响因子：
5.3
通讯作者：
L. Nghiem;P. Sammon;J. Grabenstetter;H. Ohkuma
中科院分区：
文献类型：
--
作者：
L. Nghiem;P. Sammon;J. Grabenstetter;H. Ohkuma
本文描述了一个用于模拟含盐含水层中CO2储存的全耦合地球化学组成状态方程(EOS)组成模拟器。该模拟器(GEM-GHG)模拟了以下现象：(1)多孔介质中的对流和弥散流动；(2)油、气和水相之间的相平衡；(3)水相组分之间的化学平衡；(4)矿物溶解和沉淀动力学。为了数值稳健性和稳定性，所有方程都是同时求解的。模拟结果显示了CO_2(G)和CO_2(Aq)的迁移、CO_2(Aq)向−-HCO的解离以及随后转化为碳酸盐矿物的过程。高密度富CO2卤水羽流的对流作用与羽流周围的CO2矿化作用相结合。
This paper describes a fully coupled geochemical compositional Equation-of-State (EOS) compositional simulator for the simulation of CO2 storage in saline aquifers. The simulator (GEM-GHG) models the following phenomena: (1) convective and dispersive flow in porous media; (2) phase equilibrium between the oil, gas and aqueous phase; (3) chemical equilibrium for reactions between the aqueous components and (4) mineral dissolution and precipitation kinetics. For numerical robustness and stability, all equations are solved simultaneously. The simulator is applied to the simulation of typical field-scale CO2 sequestration processes, showing the migration of CO2(g) and CO2(aq), the dissociation of CO2(aq) into − HCO and its subsequent conversion into carbonate minerals. Convection of highdensity plumes of CO2-rich brine in conjunction with CO2 mineralization around the plumes is illustrated.