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- Title
Petrographic study of palynomorphs and macerals to assess the kerogen in Gondwana and Tertiary coal seams, India.
- Authors
Pandey, Shashanka; Mendhe, Vinod A.; Shukla, Priyanka
- Abstract
The demand for energy is continuously increasing and therefore, it is necessary to explore and develop alternative energy resources like CBM, shale gas, oil shale, tight sand, etc. Recently, the extraction of kerogen from lignite, coal, oil shale, and carbonaceous shale through destructive distillation emerged as a potential source of hydrocarbon. Kerogen is a fraction of sedimentary organic matter mainly containing carbon and volatile matter. India has significant lignite, coal, and carbonaceous shale deposit in Gondwana and Tertiary formations spread over the country. There is very limited information available on kerogen occurrence, preservation, and extraction in the Indian context. In this study, lignite and bituminous coal samples obtained from Tertiary and Gondwana deposits are analyzed for geochemical, maceral and lithotype compositions, as well as for kerogen content and palynomorphological features. The moisture, ash, volatile matter and fixed carbon yields of lignite vary in the range from 5.98-7.73, 22.46-36.62, 34.96-37.91, and 20.65-36.6 wt.% and coal varies in the range from 5.39-10.71, 14.93-53.37, 22.73-37.58, 18.52-43.36 wt.%, respectively. The huminite, liptinite, and inertinite contents of lignite vary from 36-72, 7-22 and 9-45 vol.%, respectively, whereas these of vitrinite, liptinite, and inertinite of coal from 7.3-52.2,1-17 and 4.6-18 vol.%, respectively. The role of petrographic constituents, volatile matter yield and various palynomorphs for kerogen genesis has been evaluated. The petrographic ternary facies indicated kerogen generation pattern in lignite and coal. Vitrain and liptinite-rich lignite and coal has released relatively higher kerogen. Lignite having high moisture and volatile matter yield are a good source of kerogen. Various palynomorphs and their significance in kerogen preservation and accumulation, as well as the relationships among macerals, kerogen content and palynomorphs are discussed. Different extraction procedures like destructive thermal distillation and solvent extraction suitable for lignite and coal, are also described.
- Subjects
PETROLOGY; MACERAL; KEROGEN; ALTERNATIVE fuels; SEDIMENTATION &; deposition
- Publication
Bulletin of the Geological Society of Greece, 2023, p12
- ISSN
0438-9557
- Publication type
Article