非水相液体传输的耦合动力学模型及数值解

基于多孔介质流体力学和溶质运移动力学原理，建立了非水相液体在地下环境系统中传输过程的多组分多相流耦合数学模型，对多相流渗流场模型和污染物传输浓度场模型分别采用了IMPES和特征有限差分方法进行数值离散，模型中充分考虑了污染物在地下环境体系中扩散、吸附解吸、界面间分配以及微生物降解等化学反应以及气相作用，并以苯在土壤中传输的浓度分布为例，验证了模型的可靠性。该数值模型较以往数值模型相比．可有效地克服在数值解过程中的弥散和振荡，对于石油工程领域中油气藏多相流数值模拟奠定基础。

Coupled dynamic model of light non-aqueous phase liquid transport in subsurface and its numerical solution

A multicomponent and multiphase flow coupled model of pollutant transport and migration in subsurface has been established based on the theory of porous media hydrodynamic and solute transport theory. The characteristic finite difference method and implicit pressure explicit saturation method was adopted to discrete the coupled model. The model accounts for the complex process of dispersion, absorption/desorption, and distribution between liquid-solid interfaces under the assumption of local chemical equilibrium. The method can avoid numerical divergence and oscillation compared with previous numerical model. Numerical simulation results indicate the concentration of Benzene agrees well with measured values, which verifies the model reliability and practicality. It provides theoretic evidence for petroleum components quality monitoring and numerical analysis in oil-gas reservoirs.