To investigate the impact of rock heterogeneity and flowrate on reaction rates and dissolution dynamics, four millimetre-scale Silurian dolomite samples were pre-screened based on their physical heterogeneity, defined by the simulated velocity distributions characterising each flow field. Two pairs of cores with similar heterogeneity were flooded with supercritical carbon-dioxide (scCO₂) saturated brine under reservoir conditions, 50 °C and 10 MPa, at a high (0.5 ml/min) and low (0.1 ml/min) flowrate. Changes to the pore structure brought about by dissolution were captured in situ using X-ray microtomography (micro-CT) imaging. Mass balance from effluent analysis showed a good agreement with calculations from imaging. Image calculated reaction rates (r_eff) were 5-38 times lower than the corresponding batch reaction rate under the same conditions of temperature and pressure but without mass transfer limitations. For both high (Péclet number = 2600-1200) and low (Péclet number = 420-300) flow rates, an impact of the initial rock heterogeneity was observed on both reaction rates and permeability-porosity relationships.

为了研究岩石异质性和流速对反应速率和溶解动力学的影响，根据其物理异质性，通过表征每个流场的模拟速度分布定义了四个毫米规模的志留纪白云岩样品，进行了预筛选。在储层条件为50°C和10 MPa的高流量（0.5 ml / min）和低流量（0.1 ml / min）下，用超临界二氧化碳（scCO ₂）饱和盐水注入两对具有相似异质性的岩心。使用X射线显微断层扫描（micro-CT）成像原位捕获由溶解引起的孔结构变化。流出物分析的质量平衡与成像计算显示出很好的一致性。图像计算的反应速率（r _eff）在相同的温度和压力条件下比相应的分批反应速率低5-38倍，但没有传质限制。对于高流速（佩克利数= 2600-1200）和低流速（佩克利数= 420-300），都观察到初始岩石非均质性对反应速度和渗透率-孔隙率关系的影响。