QUANTITATIVE LONGITUDINAL FLUID SATURATION PROFILES WITH A SLICE-SELECTED CPMG SEQUENCE

A technique for obtaining quantitative longitudinal saturation/porosit y profiles of rock cores which are longer than the NMR coil has been d eveloped. The slice-selected experiment uses a prefocused pulse in con junction with a magnetic field gradient for the localization and a CPM G sequence to sample the data. A variety of rock core samples has been studied ranging from limestones to shaly sandstones. Comparison of th e relaxation decay curves obtained from these experiments and the hulk experiments show that reliable localized relaxation data are obtained .