Abstract
The complexity of crude oils may contribute to alteration of petroleum reservoir wetting states in ways that cannot be mimicked by model oils. Subsequent to a wet aging procedure, the molecular arrangements of crude oil adsorbates and water on calcite and quartz surfaces were investigated by various 1H NMR techniques. Solid state magic angle spinning (MAS) magnitude mode, 1H–1H double-quantum single-quantum (DQSQ), and 1H single pulse NMR spectra were used to directly observe molecules on both surfaces. T1 and T2 relaxation time measurements were used to determine molecular surface arrangement. Liquid state 1H NMR was used to investigate possible differences in the crude oil caused by the aging procedure. 1H DQSQ spectra were found most valuable in assignment of the quartz surface where the resonances from the entire adsorbate were relatively well resolved. In addition to adsorbate molecular positioning, this study also provides quantitative measurements of water present at both surfaces subsequent to wet...
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