2-SPECIES CHEMICAL-SHIFT IMAGING USING PRIOR KNOWLEDGE AND ESTIMATION THEORY - APPLICATION TO ROCK CORES

A scheme is presented whereby NMR chemical-shift imaging of two species can be achieved even when the spectral lines cannot easily be resolved in a normal spectrum. Processing of the data compensates for magnetic field inhomogeneities and also makes optimal use of the available signal-to-noise ratio in order to minimize acquisition time. The method is illustrated here with data acquired from water and dodecane in Hopeman sandstone obtained at a magnetic field strength of 2.0 T. The scheme is also applicable to imaging at very low field strength where the signal-to-noise ratio is poor, and where significant signal decay occurs during the long chemical-shift evolution periods. © 1990.