DISPLACEMENT IMAGING IN POROUS-MEDIA USING THE LINE SCAN NMR TECHNIQUE

Displacement imaging is a recent, powerful NMR method with which distr ibutions of displacements can be acquired of e.g. fluids within a poro us medium. Both motion parallel and perpendicular to the flow directio n may be observed within a time window of a few milliseconds to severa l seconds. By combining displacement imaging with the line scan techni que, one-dimensionally resolved measurements with a high temporal reso lution (<1 min) of the spatial dependency of motion can be obtained. H ere we present displacement images of flow through two simple model sy stems for soil: an unconsolidated glass bead water system and a sinter ed glass bead filter. It is demonstrated that the combination of displ acement imaging and spatial resolution along a line is important to ac cess both bulk displacement and local displacements in relation to the local porosity. (C) 1997 Elsevier Science B.V.