Bezruchko K., Burchak O., Balalaiev O., Karhapolov A., Chelkan V. The double exponential model for predicting natural regional gas content of coal beds

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Parent Category: Geo-Technical Mechanics, 2025
Category: Geo-Technical Mechanics, 2025, Issue 172

Geoteh. meh. 2024, 172, 31-41

 

THE DOUBLE EXPONENTIAL MODEL FOR PREDICTING NATURAL REGIONAL GAS CONTENT OF COAL BEDS

Bezruchko K. 

 Burchak O. 

 Balalaiev O. 

 Karhapolov A. 

 Chelkan V. 

M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine

UDC 553.98:662.74

Language: English

Abstract. Methane is a powerful greenhouse gas. Methane is the main component of coalfield gases, and since almost the entire coal-bearing strata of rocks is saturated with methane, coal production in coal mines during their exploitation and after the completion of cleaning operations is constantly accompanied by the methane release into the mined space. According to predictions, its emissions from operating underground workings will have increased quantitatively by 4 times by the year 2100, and emissions from closed mines by 8 times. Therefore, predicting its emissions into the atmosphere based on estimating the gas content of coal beds is an urgent modern objective and will remain relevant in the future.

The purpose of the work was to develop a new method for predicting the methane content of coal beds for coal of different grades according to the occurrence depth.

For the previously set dependence of the relative gradient of methane content in coal beds on the occurrence depth, the authors propose a biexponential model, which is universal for determining the gradient of methane content in coal beds of different stages of metamorphism. The new biexponential model has a physical foundation – it is based on the dependence of methane content on the sorption capacity of coal, which, in turn, is determined by pressure (depth). With this model, the natural methane content increases rapidly with increasing pressure up to 6 MPa. Then it increases slowly and slightly up to 10 MPa, reaching its maximum (maximal potential gas-bearing capacity for the corresponding degree of coalification at depths of approximately 1200 m), with subsequent stabilization. The obtained dependences of the relative gradient of gas content on depth and gas pressure for different grades of metamorphism were used to develop a method for predicting the natural regional background gas content of coal beds by determining the limiting sorption capacity of coal. The method allows for determining the natural methane content of coal of different degrees of metamorphism, considering the occurrence depth, with correction for moisture and ash content.

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

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About the authors:

Bezruchko Kostiantyn, Doctor of Geology Science, Senior Researcher, M.S. Poliakov Institute of Geotechnical Mechanics of National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Head of Department of Geology of Coal Beds at Great Depths, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. (Corresponding author) ORCID0000-0002-3818-5624

Burchak Oleksandr, Doctor of Technical Science, Senior Researcher, M.S. Poliakov Institute of Geotechnical Mechanics of National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Head of Department of Geology of Coal Beds at Great Depths, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. ORCID0000-0001-9114-8585

Balalaiev Oleksandr, Candidate of Biology Science (Ph.D.), Senior Researcher Fellow, M.S. Poliakov Institute of Geotechnical Mechanicsof National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Senior Research Fellow Department of Geology of Coal Beds at Great Depths, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. ORCID0000-0002-9389-4562

Karhapolov Andrii Candidate of Techical Sciences (Ph.D.), Researcher of Geology of Coal Beds at Great Depths, M.S.Polyakov Institute of Geotechnical Mechanics under 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. ORCID0000-0001-8945-6140

Chelkan Vira, Engineer of Department of Geology of Coal Beds at Great Depths, M.S. Polyakov Institute of Geotechnical Mechanics of 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.
ORCID0000-0002-0733-8739