Garfi Gaetano, John Cédric M, Rücker Maja, Lin Qingyang, Spurin Catherine, Berg Steffen, Krevor Samuel
Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, United Kingdom.
Department of Mechanical Engineering, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, the Netherlands; Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United Kingdom.
J Colloid Interface Sci. 2022 May;613:786-795. doi: 10.1016/j.jcis.2021.12.183. Epub 2022 Jan 10.
The macroscopic movement of subsurface fluids involved in CO storage, groundwater, and petroleum engineering applications is controlled by interfacial forces in the pores of rocks. Recent advances in modelling these systems has arisen from approaches simulating flow through a digital representation of the complex pore structure. However, further progress is limited by difficulties in characterising the spatial distribution of the wetting state within the pore structure. In this work, we show how observations of the fluid coverage of mineral surfaces within the pores of rocks can be used as the basis for a quantitative 3D characterisation of heterogeneous wetting states throughout rock pore structures.
We demonstrate the approach with water-oil fluid pairs on rocks with distinct lithologies (sandstone and carbonate) and wetting states (hydrophilic, intermediate wetting, and heterogeneously wetting).
Fluid surface coverage the within rock pores is a robust signal of the wetting state across varying rock types and wetting states. The wetting state can be quantified and the resulting 3D maps can be used as a deterministic input to pore scale models. These may be applied to multiphase flow problems in porous media ranging from soil science to fuel cells.
在碳储存、地下水和石油工程应用中，地下流体的宏观运动受岩石孔隙中的界面力控制。模拟这些系统的最新进展源于通过对复杂孔隙结构进行数字表征来模拟流动的方法。然而，由于难以表征孔隙结构内润湿状态的空间分布，进一步的进展受到限制。在这项工作中，我们展示了如何将岩石孔隙内矿物表面流体覆盖情况的观测结果用作对整个岩石孔隙结构中异质润湿状态进行定量三维表征的基础。
我们用具有不同岩性（砂岩和碳酸盐岩）和润湿状态（亲水性、中间润湿性和非均匀润湿性）的岩石上的水 - 油流体对来演示该方法。
岩石孔隙内的流体表面覆盖率是不同岩石类型和润湿状态下润湿状态的可靠信号。润湿状态可以量化，所得的三维图可作为孔隙尺度模型的确定性输入。这些可应用于从土壤科学到燃料电池等多孔介质中的多相流问题。
