Many innovative decontamination techniques, such as pulsed pumping and surfactant flushing, have been proposed to enhance the remediation performance of oil-contaminated soils. Their practical application is dependent on injection and extraction well. Therefore, these techniques can be viewed as an enhanced version of pump-and-treat technology. Since macroscopic flow phenomena are determined by microscopic fluid flow behaviors, conducting pore-scale studies on soil remediation will contribute to a deeper understanding of the remediation mechanisms associated with different pumping methods. This study examines the application of microfluidic experiments and pore-scale numerical simulations to the fluid dynamics of immiscible fluid displacement processes. The main application scenarios are reservoir development and CO₂ geological sequestration. Additionally, the primary distinction between soil remediation studies and the aforementioned scenarios is pointed out, i.e., the unsaturated initial fluid distribution. Finally, future research directions in soil remediation are discussed, emphasizing the fluid dynamic effects of initial contaminant distribution.