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Application of pulsed and high-frequency electron paramagnetic resonance techniques to study petroleum disperse systems

M.R. Gafurov, A.A. Ponomarev, G.V. Mamin, A.A. Rodionov, F.F. Murzakhanov, T. Arash, S.B. Orlinskii

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The spectral and relaxation characteristics of “free” organic radicals (FR) and vanadyl-porphyrin (VP) complexes in various petroleum disperse systems (PDS) like bitumen, petroleum, their high-molecular components and solutions were studied using stationary (conventional) and pulsed electron paramagnetic resonance (EPR) techniques in two frequency ranges (X- and W-bands, with the microwave radiation frequencies of about 9 GHz and 95 GHz, respectively). The features of the pulsed approaches (electron spin echo, modulation of the electron spin echo signal decay, electronic relaxation times) and high-frequency EPR for PDS investigations were examined. W-band EPR allows to resolve spectrally the lines from the different paramagnetic centers and more accurately determine their spectral characteristics. It is shown that the electron spin echo can be observed at room temperatures even at high magnetic fields of 3.4 T demonstrating the potential of application of pulsed EPR techniques for the low-cost oilfield measurements. Analysis of the VP transverse magnetization decay curve permits to identify electron-nuclear interactions with the 14N and 1H nuclei in situ while in the EPR spectra these hyperfine interactions usually cannot be detected. It is found from the W-band EPR measurements that FR lineshape cannot be fitted with isotropic parameters in contrast to the established X-band results. The observed effect of increasing the rates of electronic transverse relaxation in asphaltenes is described in the framework of a model of spectral diffusion between the fast- and slow-relaxing paramagnetic centers in supramolecular complexes of asphaltenes.

Electron paramagnetic resonance, petroleum disperse systems, asphaltenes


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Marat R. Gafurov
Kazan Federal University
16a Kremlevskaya st., Kazan, 420008, Russian Federation
Andrey A. Ponomarev
Tyumen Industrial University
38 Volodarsky st., Tyumen, 625000, Russian Federation
Georgiy V. Mamin
Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Alexander A. Rodionov
Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Fadis F. Murzakhanov
Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Tajik Arash
Kazan Federal University
4 Kremlevskaya st., Kazan, 420008, Russian Federation
Sergey B. Orlinskii
Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation

For citation:

Gafurov M.R., Ponomarev A.A., Mamin G.V., Rodionov A.A., Murzakhanov F.F., Arash T., Orlinskii S.B. (2020). Application of pulsed and high-frequency electron paramagnetic resonance techniques to study petroleum disperse systems. Georesursy = Georesources, 22(4), pp. 2–14. DOI: