The dynamics and plume development of injected CO₂ dispersion and dissolution through sediments into water column, at the STEMM-CCS field experiment conducted in Goldeneye, are simulated and predicted by a newly developed two-phase flow model based on Navier-Stokes-Darcy equations. In the experiment, CO₂ gas was released into shallow marine sediment 3.0 m below the seafloor at 120 m water depth in the North Sea.

The pre-experimental survey data of porosity, grain size distributions, and brine concentration are used to reconstruct the model sediments. The gas CO₂ is then injected into the sediments at a rate of 5.7 kg/day to 143 kg/day. The model is validated by diagnostic simulations to compare with field observation data of CO₂ eruption time, changes in pH in sediments, and the gas leakage rates. Then the dynamics of the CO₂ plume development in the sediments are investigated by model simulations, including the leakage pathways, the fluids interactions among CO₂/brine/sediments, and CO₂ dissolution, in order to comprehend the mechanisms of CO₂ leakage through sediments. It is shown from model simulations that the CO₂ plume develops horizontally in the sediments at a rate of 0.375 m/day, CO₂ dissolution in the sediments is at an overall average rate of 0.03 g/sec with some peaks of 0.45 g/sec, 0.15 g/sec, and 0.3 g/sec, respectively, following the increase in injection rates, when some fresh brine provided. These, therefore, lead to a ratio of 0.90~0.93 of CO₂ leakage rate to injection rate.

通过在新开发的基于Navier-Stokes-Darcy方程的两相流模型中进行模拟和预测，在Goldeneye进行的STEMM-CCS现场实验中，模拟并预测了注入的CO ₂通过沉积物分散和溶解到水柱中的动力学和羽状流发展。。在实验中，CO ₂气体被释放到北海水深120 m处海床以下3.0 m的浅海沉积物中。

实验前的孔隙率，粒度分布和盐水浓度调查数据可用于重建模型沉积物。然后将气体CO ₂以5.7 kg /天至143 kg /天的速度注入沉积物中。该模型已通过诊断模拟验证，可以与CO ₂喷发时间，沉积物的pH值变化以及漏气率的现场观测数据进行比较。然后通过模型模拟研究了沉积物中CO ₂羽状流发育的动力学，包括泄漏途径，CO ₂ /盐水/沉积物之间的流体相互作用以及CO ₂溶解，以了解CO ₂的机理。通过沉积物泄漏。从模型模拟中可以看出，CO ₂羽以0.375 m / day的速率在沉积物中水平发展，CO ₂在沉积物中的溶解以0.03 g / sec的总体平均速率分布，有些峰值为0.45 g / sec当注入一些新鲜盐水时，随着注入速率的增加，分别为0.15 g / sec和0.3 g / sec。因此，这些导致CO ₂泄漏率与注入率之比为0.90〜0.93 。