Abstract
Nuclear Magnetic Resonance (NMR) is a useful tool for analyzing gas (e.g., methane) and fluids (e.g., water, oil) in rock formations in order to derive transport and storage parameters such as pore-size distributions or relative permeability. Even though there is considerable NMR data available about hydraulic properties of rock formations, this information is only empirical. To quantify relationships between NMR parameters and transport properties and to assess and improve (numerical) models to deduce transport and storage properties from NMR data on partially saturated rocks we jointly study NMR and multi-phase flow on virtual pore systems derived from micro CT images using an adapted lattice Boltzmann algorithm for multi-phase flow and advection/diffusion processes. To allow a direct joint simulation of the both, geophysical and transport properties of partly saturated soils Lattice Boltzmann (LB) simulations for multi-phase flow and NMR relaxation have been compiled using virtual pore spaces derived from Micro CT images. These numerical experiments show a good quantitative correlation with laboratory observations regarding NMR amplitudes and decay times for varying saturation degrees.
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