石油とガスの研究

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NMR Chemical Shifts of Carbon Atoms in the Light and Heavy Oils

M.A. Varfolomeev

With the help of high-resolution 13 C nuclear magnetic resonance (NMR) spectroscopy, the structural-group features of light and heavy oils were established. The molar fractions of primary, secondary, quaternary, tertiary, and aromatic groups, the aromatic factor, and the average length of the hydrocarbon chain of aliphatic hydrocarbons in these oil samples were determined. The 13 C attached proton test (APT) NMR experiments made it possible to carry out a detailed assignment of the 13 C NMR signals in light and heavy oil samples to compare them. Structural differences between light and heavy oil samples were fixed by means of a detailed study of their 13 C NMR spectra.