NMR spectroscopic imaging of oil displacement in dolomite

Paul D. Majors, Lovelace Health System
J. L. Smith, Petroleum Recovery Research Center
F. S. Kovarik, Petroleum Recovery Research Center
Eiichi Fukushima, Lovelace Health System


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.