NMR IMAGING OF IMMISCIBLE DISPLACEMENTS IN POROUS-MEDIA

We introduce a rapid, quantitative nuclear magnetic resonance imaging (NMRI) technique to resolve and measure multiple fluid phases in porou s media. Liquids are resolved on the basis of their NMR spin-spin (T-2 ) relaxation times, and their intensities are corrected by attenuation analysis. The phase-resolved and corrected NMRI intensities are norma lized to yield fluid saturations. We present the procedure and limitat ions of this technique. We present in-situ saturation measurements for three immiscible (oil and water) displacements in the same Berea sand stone core. We compared NMRI: and effluent recovery methods. T-2 of th e displacement fluids were sensitive to displacement conditions.