Croscopic numerical simulation study of CO2 residual storage mechanism in brackish water layer
A two-dimensional gas-liquid two-phase seepage model was established based on the binarized images generated from the electron microscopy scans of the core casts at the mine site,and the influences of factors such as reservoir wettability,gas-liquid two-phase interfacial tension and formation water reflux rate on the effect of CO2 residual storage was analyzed using the phase field method.The results show that after the reflux of water,a large amount of CO2 is sequestered,and the CO2 storage state is mainly in the form of column,solitary drop and blind end.The speed of water reflux has a greater influence on the residual gas saturation,while reservoir wettability and gas-liquid interfacial tension have a smaller influence on the residual gas saturation.This study can contribute to the understanding the CO2 residual storage mechanism from a microscopic perspective.
brackish water layerCO2 residual storagemicroscopic numerical simulationphase-field method
万方数据
