HR: 0830h
AN: H11G-0938    [PDF]
TI: Lattice Boltzmann Simulations of Pulsed Field Gradient Nuclear Magnetic Resonance
AU: * Boudjema, M
EM: mouna@physics.unr.edu
AF: University of Nevada, Reno, Department of Physics/220, Reno, NV 89557 United States
AU: Guyer, R A
EM: guyer@physics.umass.edu
AF: Univ of Massachusetts, Amherst, Department of Physics, Amherst, MA 01003 United States
AU: McCall, K R
EM: mccall@unr.edu
AF: University of Nevada, Reno, Department of Physics/220, Reno, NV 89557 United States
AB: Nuclear magnetic resonance (NMR) has become a powerful well-logging tool for understanding pore space geometry of reservoir rocks in-situ. This is because, in many rocks the decay of nuclear magnetization carried by a fluid, (e.g., proton magnetization on H$_2$O molecules) is most strongly influenced by relaxation at the pore walls. We have developed a lattice Boltzmann computational procedure to model this process in 2-dimensions. We examine transverse magnetization by simulating Pulsed Field Gradient NMR (PFG-NMR) experiments. The decay of the transverse magnetization is described by the intermediate scattering function $G(k,t)$ from which we calculate the diffusion constant $D(t)$. Analysis of $D(t)$ at short time yields information about the surface to volume ratio $S/V$ of the pore space. We study $S/V$ so determined for a variety of model systems.
DE: 1829 Groundwater hydrology
DE: 3210 Modeling
DE: 3929 NMR, Mossbauer spectroscopy, and other magnetic techniques
SC: Hydrology [H]
MN: 2003 Fall Meeting