Abstract
The study of organic matter content and composition in source rocks using the methods of organic geochemistry is an important part of unconventional reservoir characterization. The aim of this work was the structural group analysis of organic matter directly in the source rock in combination with a quantitative assessment and surface distribution analysis of the rock sample by FTIR spectroscopy and FTIR microscopy. We have developed new experimental procedures for semi-quantitative assessment of the organic matter content, composition and distribution in the source rocks and applied these procedures for the study of the samples from the Bazhenov shale formation (West Siberia, Russia). The results have been verified using the data from the study of organic matter obtained by Rock-Eval pyrolysis and differential thermal analysis. The obtained results demonstrate the prospects of FTIR spectroscopy and FTIR microscopy application for non-destructive and express analysis of the chemical structure and distribution of organic matter in rocks.
Highlights
Mineralogical and geochemical information on reservoirs, including unconventional, and different types of source rocks is necessary to assess the gas and oil generation potential and production technologies
An intense band at 1200–900 cm−1 has been detected in all samples, which is characteristic for shale rocks and is assigned to the Si-O bond arising from the silicate (SiO42−)
The content and chemical composition of organic matter of a series of the Bazhenov Formation kerogen and rock samples were examined by Fourier transform infrared spectroscopy (FTIR) in transmission and ATR modes
Summary
Mineralogical and geochemical information on reservoirs, including unconventional, and different types of source rocks is necessary to assess the gas and oil generation potential and production technologies. The organic matter content is commonly assessed by combustion methods, such as total organic carbon (TOC) analysis and Rock-Eval pyrolysis [2]. Many techniques have been applied to provide qualitative and semi-quantitative analysis of kerogen chemical structure, such as vitrinite reflectance [3,4], nuclear magnetic resonance (SS NMR) [5,6] and combinations of flash pyrolysis with gas chromatography [7]. High-field NMR spectroscopy analysis delivers insights into the kerogen structure, and the sample preparation, experiments and data processing are complex. The technique has low sensitivity for highly mature and post-mature samples
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