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Sorption capacity and natural gas content of coal beds of Donbas

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Category: Content №4 2024

Last Updated on 28 August 2024

Published on 30 November -0001

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Authors:

K.A.Bezruchko*, orcid.org/0000-0002-3818-5624, Institute of Geotechnical Mechanics named by N.Poljakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.V.Burchak, orcid.org/0000-0001-9114-8585, Institute of Geotechnical Mechanics named by N.Poljakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine

L.I.Pymonenko, orcid.org/0000-0002-5598-6722, Institute of Geotechnical Mechanics named by N.Poljakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine

V.V.Chelkan, orcid.org/0000-0002-0733-8739, Institute of Geotechnical Mechanics named by N.Poljakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine

^* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2024, (4): 018 - 026

https://doi.org/10.33271/nvngu/2024-4/018

Abstract:

Purpose. To determine the general patterns in the formation of the sorption capacity of coal and the natural regional methane content of coal beds using a quantitative indicator – the relative gradient of gas content.

Methodology. To determine the sorption capacity of coal, the authors used the well-known “volumetric method” and the method of EPR-spectroscopy (electron paramagnetic resonance). We used the results obtained during geological exploration to analyze the natural gas content of coal beds. The determination of natural gas content was carried out using special gas-core-samplers and formation testers. Methods of mathematical statistics were used to process experimental data.

Findings. According to experimental data regarding the sorption methane-bearing capacity and natural gas content of Donbas coal beds, we carried out the analysis, statistical processing, and generalization of the obtained results. A regular change in the relative gradient of coal beds’ methane content has been established for the entire Donbas as a whole. The values of relative gradients for coals of various grades naturally decrease with increasing stratification depth and also naturally decrease in each depth interval from low-metamorphosed (grade D) coal to highly-metamorphosed one. Based on the approximation results, the corresponding equations were obtained for each grade of coal metamorphism from gas to-anthracite (A).

Originality. New indicators have been proposed – the relative gradient of sorption methane-bearing capacity and the relative gradient of gas content, which allow comparison of these characteristics measured in absolute values (cm³/g, m³/t) for individual coal beds of different grades of metamorphism, at different depths and lying in different geological conditions. It has been proven that the sorption capacity of coal matter determines the natural regional (background) methane content of coal beds, and naturally, according to a hyperbolic dependence, decreases with increasing stratification depth and also naturally decreases in each of the depth intervals from low-metamorphosed coal (grade D) to highly metamorphosed one (grade A), with a relative gradient that asymptotically approaches to 1 at pressures above 6 MPa.

Practical values. The obtained dependences of the relative gradient of gas content on depth and gas pressure for various grades of metamorphism can be used to predict the natural regional (background) gas content of coal beds by determining the maximum sorption capacity and calculating the desired depth or pressure.

Keywords: Donbas, coal beds, sorption capacity, gas content

References.

1. Bukowska, M., & Bukowski, P. (2023). Investigation of Geomechanical Properties of Carboniferous Rocks for Evaluating the Possibility of Energetic Use of Water and Methane from Hard Coal Mines. Archives of Mining Sciences, 68(2), 207-225. https://doi.org/10.24425/ams.2023.146176.

2. Zhang, L., Ye, Z., Li, M., Zhang, C., Bai, Q., & Wang, C. (2018). The binary gas sorption in the bituminous coal of the Huaibei Coalfield in China. Adsorption Science & Technology, 36(9-10), 1612-1628. https://doi.org/10.1177/0263617418798125.

3. SOU 10.1.00174088.011-2005 Rules for conducting mining operations in strata prone to gas-dynamic phenomena (2005). Kyiv: Minvuhleprom Ukrainy. Retrieved from https://issuu.com/mitc2/docs/026.

4. Rudko, H. I., Bulat, A. F., & Kuznetsova, L. D. (2015). Methodological recommendations for the geological study on the gas-bearing capacity of coal beds and host rocks for the calculation of reserves and the assessment of gas (methane) resources of underground coal deposits, (pp. 106-112). Kyiv: Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine. Retrieved from https://www.nas.gov.ua/EN/Book/Pages/default.aspx?BookID=0000009846.

5. Harinandan, K., Mishra, M. K., & Mishra, S. (2019). Sorption capacity of Indian coal and its variation with rank parameters. Journal of Petroleum Exploration and Production Technology, 9, 2175-2184. https://doi.org/10.1007/s13202-019-0621-1.

6. Wen, Z., Yang, Y., Wang, Q., & Yao, B. (2021). Mechanism and characteristics of CH₄/CO₂/H₂O adsorption in lignite molecules. Geofluids, 2021. https://doi.org/10.1155/2021/5535321.

7. Perera, M. S. A., Ronjith, P. G., Choi, S. K., Airey, D., & Weniger, P. (2012). Estimation of Gas Adsorption Capacity in Coal: A Review and an Analytical Study. International Journal of Coal Preparation and Utilization, 32(1), 25-55. https://doi org/10.1080/19392699.2011.614298.

8. Gao, D., Hong, L., Jiren Wang, J., & Zheng, D. (2019). Adsorption simulation of methane on coals with different metamorphic grades. AIP Advances, 9, 095108. https://doi.org/10.1063/T5115457.

9. Kui Dong, Zhiwei Zhai, & Aijun Guo (2021). Effects of Pore Parameters and Functional Groups in Coal on CO₂/CH₄ Adsorption. ACS Omega, 6, 32395-32407. Retrieved from http://pubs.acs.org/journal/acsodf.

10. Ekundayo, J. M., & Rezaee, R. (2019). Volumetric measurements of methane-coal adsorption and desorption isotherms – effects of equations of state and implication for initial gas reserves. Energies, 12. https://doi.org/10.3390/en12102022.

11. Raharjo, S.., Bahagiarti, S., Purwanto, H. S., & Rahmad, B. (2018). The effect of coal petrology on the capacity of gas methane absorption in coal formation Tanjung Barito in Binuang Region. South Kalimantan. Series: Earth and Environmental Science, 212(2018), 012029. https://doi.org/10.1088/1755-1315/212/1/012029.

12. Okolo, G. N., Everson, R. C., Neomagus, H. W. J. P., Sakurovs, R., Grigore, M., & Bunt, J. R. (2019). Dataset on the carbon dioxide. methane and nitrogen high-pressure sorption properties of South African bituminous coals. Elsevier, 25, 40-53. https://doi.org/10.1016/j.dib.2019.104248.

13. Czerw, K., Dudzińska, A., Baran, P., & Zarębska, K. (2019). Sorption of carbon dioxide on the lithotypes of low rank coal. Adsorption, 25, 965-972. https://doi.org/10.1007/s10450-019-00122-5.

14. Wojtacha‑Rychter, K., Howaniec, N., & Smoliński, A. (2020). Effect of porous structure of coal on propylene adsorption from gas mixtures. Scientific reports, 10, 11277. https://doi.org/10.1038/s41598-020-67472-x.

15. Barbara Dutka (2021). Effect of depth on the sorption capacity of coals affected by outburst hazard. Energies, 306. https://doi.org/10.1016/j.fuel.2021.121611.

16. Godyn, K., Dutka, B., Chuchro, M., & Młynarczuk, M. (2020). Synergy of Parameters Determining the Optimal Properties of Coal as a Natural Sorbent. Energies, 13, 1967. https://doi.org/10.3390/en13081967.

17. Bulat, A.F., Lukinov, V.V., & Bezruchko, K.A. (2017). Conditions of gas traps forming in carboniferous sediments. Kyiv: Naukova Dumka. ISBN 978-966-00-1534-0.

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