Bezruchko K., Baranovskyi V. Secondary macerals of coals as an indicator of transformation of gelified matter
- Details
- Parent Category: Geo-Technical Mechanics, 2024
- Category: Geo-Technical Mechanics, 2024, Issue 170
Geoteh. meh. 2024, 170, 90-99
DETERMINING THE POSSIBILITIES OF USING FLY ASH ON THE EXAMPLE OF THE DTEK PRYDNIPROVSKA TPP
SECONDARY MACERALS OF COALS AS AN INDICATOR OF TRANSFORMATION OF GELIFIED MATTER
Bezruchko K. 
Baranovskyi V.
M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine
UDC 552.574.12.08:550.85
Language: English
Abstract. Coal is a valuable fossil raw material for the power, metallurgy, and chemical industries. The intended usage of a particular coal is determined by several reasons, including its petrographic composition. The petrographic composition of coals as a set of macerals is formed in diagenesis and is unchangeable according to normative documents. In this paper, based on the long-term practice of the petrographic study of coals, we show the macerals referred to a certain group by their petrographic features (shape, color, brightness, relief). Still, by genesis, they have nothing to do with this group. They are the product of the gelified matter transformation, i.e. "primary" macerals of the vitrinite group, thus being "secondary macerals". In such cases, errors may occur in evaluating the properties of coals as raw materials for a particular industry.
The paper aims to give examples for the identification of "secondary macerals" of coals depending on their genesis and to give recommendations for their consideration. Genetic prerequisites for the occurrence of "secondary macerals" are described. Basically, it is a transformed gelified substance as a result of stress thermal impact by gas fluid, solidification of liquid phase of fluid on vitrinite of interlayer surfaces, dynamometamorphism in fractured zones, bacteriological processing. The authors carried out research with the help of video-optical complex: MBI-11, NV200, software Scope photo. The genesis of "secondary" macerals can be varied: stress thermal transformation of gelified substance by gas fluid, solidification of liquid phase of fluid on vitrinite of interlayer surfaces, dynamic metamorphism in fractured zones, bacteriological processing of the gelified matter, chemical reactions between liptinite and vitrinite during regional metamorphism. It is recommended, when diagnosing maceral as a "secondary" one, to exclude it from the calculation of petrographic composition in order not to make a mistake in estimating the properties of coal, for the reason that their properties are not studied at this stage. Since the counting is carried out according to the principle of "chessboard" the excluding the fact of meeting of such maceral will not significantly affect the result.
Keywords: coal, petrographic composition, optical microscopy, macerals, gelified matter.
REFERENCES
1. Bezruchko, K.A., Pimonenko, L.I., Baranovskуі, V.I. and Gopkalo V.V. (2020), “Digital processing of coalpetrography photomicrographs as a method for solving the applied geological problems”, Geotehnicheskaya mehanika, vol. 150, pp.74–81, https://doi.org/10.15407/geotm2020.150.074.
2. Uziiuk, V.I. and Shainoha, I.V. (2024), Mikrostrukturnyi anatomo-morfolohichnyi vyznachnyk vuhletvornykh roslyn karbonu i prohnozu yakosti vuhillia Donbasu (mikropaleobotanika vuhillia karbonu) [Microstructural anatomical and morphological determinant of carbon-forming plants of carbon and forecast the quality of Donbas coal (micropaleobotany of Сarbon coal)], LNU im. Ivana Franka, Lviv, Ukraine.
3. International Committee for Coal and Organic Petrology, [Electronic resource], available at: https://www.iccop.org/ (Accessed 14 September 2024).
4. TSOP – the Society of Organic Petrology, [Electronic resource], available at: https://www.tsop.org/join_TSOP.html (Accessed 25 September 2023).
5. ASTM International (2021), D2799-21: Standard Test Method for Microscopical Determination of the Maceral Composition of Coal, West Conshohocken, PA, USA.
6. Stach, E., Mackowsky, M-Th., Teichmuller, M.,Taylor, G. H., Chandra, D. and Teichmuller, R. (1982), Stach’s textbook of coal petrology, Gebruder Borntraeger, Berlin, Germany.
7. Curiale J.A. and Curtis J.B. (2016), "Organic geochemical applications to the exploration for source-rock reservoirs-A review", Unconventional Oil and Gas Resources, vol. 13, pp. 1−31. https://doi.org/10.1016/j.juogr.2015.10.001
8. Mastalerz, M., Drobniak, A. and Stankiewicz, A.B. (2018), "Origin, properties, and implications of solid bitumen in source-rock reservoirs: a review", Intern. Coal Geol., vol. 195, pp.14-36. https://doi.org/10.1016/j.coal.2018.05.013
9. Bezruchko, K. A. and Baranovskyi, V. I. (2014), "Marks of gas-generation processes in Donbas coal", Ugol' Ukrainy, vol. 11, p. 31-33.
10. Reynolds, D. L. (1954), "Fluidization as a geological process, and its bearing on the problem of intrusive granites", Am. four. Sci, vol. 252, pp. 577-613. https://doi.org/10.2475/ajs.252.10.577
11. Golubev, A.A., Majboroda, A.A., Anciferov, V.A. and Kanin, V.A. (2008), "The genetic aspect of the formation of accumulations and deposits of free hydrocarbon gases in the Greater Donbas", Naukovi pratsi UkrNDMI NAN Ukrainy, vol. 3, pp. 25-40.
12. Bezruchko, K. A., Pymonenko, L. I., Balalaiev, O.K. and Baranovskyi, V. I. (2019), "A new determination method for coal metamorphism degree", Naukovyi Visnyk NHU, vol. 3, pp. 5-11. https://doi.org/10.29202/nvngu/2019-3/1
13. Whiticar, M.J. (1990), "A geochemical perspective of natural gas and atmospheric methane", Org. Geochem., vol.16, pp. 531-547. https://doi.org/10.1016/0146-6380(90)90068-B
About the authors:
Bezruchko Kostiantyn, Doctor of Geology Science (D.Sc.), Senior Researcher, Head in Department of Geology of Coal Beds at Great Depths, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID0000-0002-3818-5624
Baranovskyi Volodymyr, Engineer, Junior Researcher of Geology of Coal Beds at Great Depths, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0000-0002-0409-5292