Thermal Maturity and Structural Characterization of Indian Coals: Insights from Petrographic, Pyrolytic and Spectroscopic Methods
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Le résumé fourni par la source
ABSTRACT Characterisation of Indian coal samples, collected from various coal-bearing sequences, was performed using spectroscopic techniques (Fourier Transform Infrared and Raman) to understand the structural changes associated with the thermal maturity. The vitrinite reflectance (VRo%) in the studied samples ranges from 0.28 % to 0.92 % and the Tmax ranges between 402 °C and 473 °C. A strong correlation (R2=0.95) between VRo% and Tmax indicates the reliability of these proxies. The elemental data shows carbon (av. 50.51 wt %), hydrogen (av. 2.78 wt %), nitrogen (av. 0.78 wt %) and sulfur (av. 1.34 wt %) contents. Rock-Eval and Fourier Transform Infrared Spectroscopic (FTIR) parameters collectively suggest the kerogen as Type III. The samples exhibit a range of hydroxyl, aliphatic, aromatic and oxygenated functional groups. FTIR semi-quantitative ratios were applied to examine the compositional variations across the rank, revealing an increase in aromaticity and aromatic ring condensation, as evident from the I1, Car/ (Car + C=O, CHar/C=C, and Har/Car ratios. Additionally, an increase in the aromatic hydrogen content is apparent from the fH and Hal/Hratios. The de-functionalisation of oxygenated functional groups is manifested in decrease in the C-factor. Below a VRo of 0.5%, the samples exhibit consistent behaviour; however, beyond this point, the behaviour becomes abrupt, probably due to the physico-chemical factors controlling the transformations beyond the first coalification jump and/or the diverse origin of the samples. The Raman spectra showed variation of the D-band with respect to VRo, and the D1A/GA ratio also supports this trend. The hydrogen index (HI) vs. oxygen index (OI) plot showed distinct clustering of the samples according to maturity, suggesting these variations are well-defined across all samples, irrespective of their location and source characteristics.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Thermal Maturity and Structural Characterization of Indian Coals: Insights from Petrographic, Pyrolytic and Spectroscopic Methods
- Date Crossref
- 01/01/2026
- Éditeur
- Geological Society of India
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Birbal Sahni Institute of Palaeosciences pays non établi dans la noticeStructure de recherche
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Academy of Scientific and Innovative Research pays non établi dans la noticeUniversité ou école supérieure
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University of Lucknow pays non établi dans la noticeUniversité ou école supérieure
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National Geophysical Research Institute pays non établi dans la noticeStructure de recherche
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Banaras Hindu University Institute of Science pays non établi dans la noticeUniversité ou école supérieure
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Lucknow - 226007 pays non établi dans la noticeInstitution
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Ghaziabad - 201002 pays non établi dans la noticeInstitution
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Hyderabad - 500007 pays non établi dans la noticeInstitution
Birbal Sahni Institute of Palaeosciences, Academy of Scientific and Innovative Research et University of Lucknow, avec 5 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.