裂隙两相流与非费克物质传输特征及耦合机理研究

裂隙多相流和非费克物质运移耦合机制是研究污染物在基岩裂隙介质中运移的关键科学问题，也是近些年水文地质学、石油工程和环境工程等学科非常活跃的前沿课题。本项目采用室内实验、数值模拟、理论分析相结合的方法，研发细观（厘米）尺度上水-油两相流和物质在粗糙裂隙中的渗流、传输实验系统，研究变饱和度对非费克物质运移规律的影响，分析裂隙非均质性、外界压力、粘度比对两相流和物质运移的控制机理，开发两相流和非费克物质运移耦合数值模型，建立宏观上描述两相流和非费克物质运移的数学模型和分析方法。本项目对两相流渗流特性对非费克物质运移的影响机制研究具有重要意义，最终为基岩裂隙水污染预测提供科学支撑。

The coupling mechanisms of two-phase flow and non-Fickian transport is the key issue to fully understand contaminant transport process in subsurface fractured media, and is also the most active frontier of many disciplines including hydrogeology, petroleum engineering, and environmental engineering, etc. This proposal attempts to adopt a multipronged method, including physical laboratory experiments, numerical simulations, and theoretical analysis, to address the coupling mechanisms. Based on to-be-developed advanced laboratory system at the centimeter scale for simulating water-oil two-phase flow and contaminant transport, our proposal aims to investigate the effects of fracture heterogeneity, pressure gradient, and viscosity ratio on two-phase flow process, and the subsequent effects of varying water saturation on non-Fickian transport. Additionally, our proposal plans to develop a highly efficient numerical simulator that simultaneously consider two-phase flow and contaminant transport processes. The goal of this proposal is to establish a new empirical model and advanced techniques to quantitatively characterize the coupling mechanisms. Our proposal should shed light on understanding the effects of two-phase flow on contaminant transport at the mechanics level, which adds a great value in assessing contaminants in fractured reservoir.