Baranov V., Antipovych Y., Kyrychenko V. Gas content and safety factors of the Donetsk coal basin deposits in Ukraine

Details
Parent Category: Geo-Technical Mechanics, 2024
Category: Geo-Technical Mechanics, 2024, Issue 171

Geoteh. meh. 2024, 171, 5-14

https://doi.org/10.15407/geotm2024.171.005

 

GAS CONTENT AND SAFETY FACTORS OF THE DONETSK COAL BASIN DEPOSITS IN UKRAINE

Baranov V.

Antipovych Y.

Kyrychenko V.

1M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine

UDC 552.513: 622.831.322

Language: English

Abstract. The subject of the article is the process of changing of the terrigenous deposit properties in the Donetsk coal basin. During the research, classical geological methods of mineralogy and petrography were used. They allow obtaining comparable results of the formation and transformation of terrigenous deposits and their properties that affect the safety of mining operations and the possibility of associated gas production.

The complex of structural-mineralogical and physical-mechanical transformation factors of terrigenous deposits of the Donetsk coal basin at different substages of catagenesis is considered, which leads to an increase or decrease in gas content, a change in the properties and state of the studied rocks under the influence of changing thermogasdynamic parameters with an increase in the paleodepth of coal and rock occurrence, and the transformation of their structural parameters into more resistant to new conditions.

The mineralogical parameters that significantly affect the reservoir properties of rocks specifically for the conditions of the Donetsk Basin include primary sedimentary and secondary carbonates. The process of structural transformation of primary carbonate into secondary one leads to a significant decrease in the porosity and permeability of sediments.

The previously established boundary of middle and late catagenesis in the area of low volatile bituminous coal occurrence is a natural barrier to the existence of gas-bearing rocks (except coals). This barrier is characterized by the transition of the prevailing intergranular pore space to a mixed type of reservoirs (pore, fissured-pore and fissured) with low total porosity and gas permeability. The Donetsk coal basin deposits of the late substage of catagenesis do not have significant accumulations of methane (semi-anthracite, anthracite, meta-anthracite), sandstones are not hazardous for outbursts, gas is present only in coal seams and interlayers, as well as in disturbed zones.

The main factors of the properties of terrigenous deposits of the Donetsk coal basin, which affect gas content and outburst hazard, are the structure of sandstones, the degree of sorting, the number of fractions, the degree of compaction of deposits, tectonic processes, the amount and composition of cement, primarily secondary carbonates, as well as the current substage of a particular sandstone.

Keywords: coal basin, gas content, petrography, sandstones, structure.

 

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About the authors:

Baranov Volodymyr, Doctor of Geology (D.Sc.), Professor, Head of Laboratory for the Study of Structural Changes in Rocks, 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. (Corresponding author), ORCID 0000-0002-6661-668X

Antipovych Yana, Candidate of Geology (Ph.D), Senior Researcher of Laboratory for the Study of Structural Changes in Rocks, 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 0000-0002-7929-9599

Kyrychenko Viktoriia, Master of Sciences, Principal Engineer of Department of Ecology of Natural Resources Development, 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 0000-0002-6462-8206