Applications of Fourier-Transform IR Spectroscopy to Comprehensive Analysis of Sedimentary Rocks

Possibilities of Fourier-transform IR spectroscopy and Fourier-transform IR microscopy with for the structural group and distribution analysis of sedimentary rock samples are presented on an example of oil shale of the Bazhenov formation of the West Siberian oil and gas basin. The results are consid...

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Bibliographic Details
Published in:Journal of analytical chemistry (New York, N.Y.) N.Y.), 2023-12, Vol.78 (12), p.1620-1629
Main Authors: Tanykova, N. G., Petrova, Yu. Yu, Spasennykh, M. Yu, Kozlova, E. V., Leushina, E. A., Kostina, J. V.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Chemical properties
Chemistry
Chemistry and Materials Science
Fourier transform infrared spectroscopy
Fourier transforms
Fragments
Heterogeneity
Infrared spectroscopy
Kerogen
Microscopy
Nondestructive testing
Oil shale
Organic matter
Pyrolysis
Rocks, Sedimentary
Sedimentary rocks
Shale gas
X-ray fluorescence
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Summary:Possibilities of Fourier-transform IR spectroscopy and Fourier-transform IR microscopy with for the structural group and distribution analysis of sedimentary rock samples are presented on an example of oil shale of the Bazhenov formation of the West Siberian oil and gas basin. The results are considered in combination with a set of methods used in the geochemical analysis of rocks, i.e., programmed pyrolysis according to the Rock–Eval procedure, X-ray fluorescence spectrometry, and elemental CHNS/O analysis. It is shown that the IR spectroscopy method can be used for structural group analysis and the estimation of organic matter content directly in oil source rocks. In the studied samples of kerogen-saturated rocks of the Bazhenov formation, the concentration of organic matter is in good agreement with the results of pyrolysis, and the amount of aliphatic fragments exceeds that of aromatic fragments by 2.0–2.3 times, which corresponds to transformed type II kerogen. Fourier-transform IR microscopy, known as a convenient non-destructive method of analysis, also offers a possibility of the distribution analysis of organic matter over the polished surface of a sample using color area mapping. Using samples of the Bazhenov formation as an example, the heterogeneity of the composition of rocks and the uneven distribution of organic matter in unconventional reservoirs was demonstrated; this ensures the effective use of the IR microscopy method in combination with other methods for studying oil source rocks.
ISSN:1061-9348
1608-3199
DOI:10.1134/S106193482312016X