Abstract
ABSTRACT Determination of the wettability characteristics of reservoir rock is difficult and time-consuming. Nuclear Magnetic Resonance (NMR) relaxation measurements provide a quantitative, fast, and relative easy technique for determining rock wettabilities. We have used NMR relaxation experiments to study the wettability of various bead packs and rock samples. Specifically, we have used T1 (longitudinal relaxation time in laboratory frame) and T1ρ (longitudinal relaxation time in rotating frame) measurements in H2O or D2O in porous media to characterize the wetting. Such studies enabled us to explain the apparent contradictory observations of previous investigators. The data indicate that in the absence of magnetic impurities on the surfaces, both H2O and D2O have shorter relaxation times in water-wet porous media than in oil-wet media. Carbonate core samples were treated to create preferentially water-wet and preferentially oil-wet systems, and NMR measurements of such cores were compared with the combined Amott/USBM method. The results showed good agreement between the wetting behavior obtained from NMR relaxation and that from the combined Amott/USBM method.
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