From core-scale experiment to reservoir-scale modeling: A scale-up approach to investigate reaction-induced permeability evolution of CO 2 storage reservoir and caprock at a U.S. CO 2 storage site
作者： Yan Wang , Liwei Zhang , Yee Soong , Robert Dilmore , Hejuan Liu
DOI: 10.1016/J.CAGEO.2019.01.006
关键词:
摘要: Abstract Mineral dissolution and secondary mineral precipitation can cause porosity permeability changes of CO2 storage reservoirs caprocks after injection CO2. In this paper, a 3-step approach (core-scale experiment →core-scale modeling →reservoir-scale modeling) is developed to simulate reservoir-scale evolution formation caprock at model site. The site based on characteristics real in Mississippi, USA. Important chemical parameters the are validated by core-scale experimental reactive transport results. predicts maximum 3.2% increase 1.1% 1000 years exposure CO2-rich brine, while 7% decrease for small core 296% 180-day brine. discrepancy between results attributed strong pH buffering effect with large mass H+-consuming minerals. Therefore, using experiments/models only not sufficient elucidate evolution. Variations key have both caprock, except variations Keq (SiO2 (am)) exponent n permeability-porosity correlation. SiO2 (am) that governs given
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