NMR spectroscopic imaging of oil displacement in dolomite
An NMR echo-time-encoded spectroscopic imaging technique was used to study the displacement of oil by water-flooding in a dolomite (CaMg(CO3)2) core sample. We found that this spectroscopic imaging modality is particularly useful for systems such as this where T2 is short but the chemical-shift separations are still large compared with their linewidths. The water does not form a well-defined front but rather a heterogeneously distributed diffuse structure which is on a scale that is finer than the resolution of the present imaging experiment, i.e., 1.2 × 1.2 × 1.6 mm. © 1990.