Qualitative and quantitative analysis of oil samples extracted from some Bashkortostan and Tatarstan oilfields based on NMR spectroscopy data

Measurements of crude oil samples by nuclear magnetic resonance spectroscopy were carried out. The quantitative fractions of aromatic molecules and functional groups constituting oil hydrocarbons in several samples were determined and their slight variation from sample to sample was shown. Information on content of general functional groups (tertiary and primary carbon atoms, aromatic cores) and possible presence of olefins or water impurity can be obtained. Basic 1H measurements are rather fast and require several minutes. Experiments on modern high-field spectrometers provide better resolution of overlapping regions in 13C NMR spectra and thus would be more convenient to get detailed information on the amount of different alkyl substituents. Slight but obvious differences were observed between the spectra of the samples taken from different levels of the same oil well.