Significance of infrared spectroscopic branching factor for investigation of structural characteristics of alkanes, geochemical properties and viscosity of oils Scientific paper

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Published: Jan 14, 2022
Updated: 14.01.2022
DOI: https://doi.org/10.2298/JSC210830091S
Keywords:
infrared spectroscopy alkane branching oil genetic types viscosity Serbian oil fields Pannonian Basin

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Jelena Z. Stevanović
STC-NIS Naftagas, Upstream Laboratory, Put šajkaškog odreda 9, 21000 Novi Sad, Serbia
https://orcid.org/0000-0003-1812-1866
Anton R. Rakitin
STC-NIS Naftagas, Upstream Laboratory, Put šajkaškog odreda 9, 21000 Novi Sad, Serbia
https://orcid.org/0000-0002-2947-2277
Ivan D. Kojić
University of Belgrade, Innovation Center of the Faculty of Chemistry, Studentski trg 12-16, 11000 Belgrade, Serbia
https://orcid.org/0000-0001-7737-1844
Nikola S. Vuković
Municipality of Kladovo, Kralja Aleksandra 35, 19320 Kladovo, Serbia
https://orcid.org/0000-0002-3607-5907
Ksenija Stojanović
University of Belgrade, Faculty of Chemistry, Studentski trg 12–16, 11000 Belgrade, Serbia
https://orcid.org/0000-0002-5566-2648

Abstract

A detailed investigation of significance of the infrared (IR) spectro­scopic branching factor (СН2/СН3; the ratio of methylene and methyl group peak heights at 2917–2921 and 2951–2954 cm-1, respectively in the IR spectra) for charac­te­ri­za­tion of alkane structure, geochemical properties and viscosity of 76 oil samples was performed. These oils, originating from 13 Serbian oil fields in SE Pannonian Basin, differ according to source and depositional envi­ronment of organic matter (OM), as well as by thermal maturity and biodeg­rad­ation stage. Methylene and methyl asymmetric stretching peak absorbances were used for the branching factor calculation. CH2 peak positions exhibited
3–4 cm-1 red shift with increasing the CH2/CH3 ratio, due to a greater contri­bution of trans vs. gauche rotamers in ali­pha­tic chains. Comparing IR spectra of the oils and model n-alkanes, it was established that the average (CH2)n methylene chain length per СН3 group varied from n = 3.5 to 6.5. The CH2/CH3 ratio showed significant concordance with geochemical para­meters, enabling clear distinction of the oils according to source and deposi­ti­onal environment of OM. At the same time, dependence of the CH2/CH3 ratio on oil maturity in the range from immature to mature was not observed, allowing for an accurate determination of oil genetic types irrespective of maturity. The CH2/CH3 ratio showed good accordance with oil biodegradation scale and oil viscosity.

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[1]
J. Z. . Stevanović, A. R. . Rakitin, I. D. . Kojić, N. S. . Vuković, and K. Stojanović, “Significance of infrared spectroscopic branching factor for investigation of structural characteristics of alkanes, geochemical properties and viscosity of oils: Scientific paper”, J. Serb. Chem. Soc., vol. 87, no. 1, pp. 41–55, Jan. 2022.
Issue
Vol. 87 No. 1 (2022): In Memoriam Issue Devoted to Prof. Petar Pfendt
Section
In Memoriam Issue Devoted to Prof. Petar Pfendt
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