Modelling of kinetic interface sensitive tracers reactive transport in 2D two-phase flow heterogeneous porous media

¹ Dept. of Applied Geology, Geoscience Centre of the University of Göttingen, Goldschmidtstr. 3, 37077, Göttingen, Germany
² Faculty of Hydrotechnics, Technical University of Civil Engineering Bucharest, Bucharest, Romania

^* Corresponding author: alexandru.tatomir@geo.uni-goettingen.de

Abstract

Fluid-fluid interfacial area plays an important role for mass- and energy-transfer processes across the interface which is relevant in several hydrogeological and engineering applications, e.g. enhanced oil-gas recovery, CO₂ storage in geological formations, unconventional geothermal systems, contaminant removal, etc. Kinetic interface sensitive tracers were designed to determine the size of the interface between two fluids by undergoing hydrolysis at the fluid-fluid interface. This study investigates by means of numerical modelling the influence of heterogeneity on the KIS tracer breakthrough curves in six idealized scenarios (S1-S6). It is an extension of the previous work conducted in “one-dimensional” column experiments by Tatomir et al. (2018) [1]. The changes in interfacial area are created by inclusion of heterogeneities at the Darcy-scale. The results show that KIS tracers can be used in two-dimensional experimental setup and can provide information about the size and dynamic evolution of interfacial area. Therefore, this is a first step for the dimensioning of an experimental flume.