gas-coal fields – Geology and Geochemistry of Combustible Minerals

Posted on December 2024December 2024 by GGCMJournal

GAS-COAL FIELDS OF THE LVIV-VOLYN COAL BASIN

Home > Archive > No. 3–4 (195–196) 2024 > 62–72

Geology & Geochemistry of Combustible Minerals No. 3–4 (195–196) 2024, 62–72

https://doi.org/10.15407/ggcm2024.195-196.062

Iryna BUCHYNSKA¹, Mykhailo MATROFAILO²
Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, Ukraine, e-mail: ¹ibuchynska@ukr.net; ²mmatrofaylo@gmail.com

Abstract

Methane deposits in coal beds are related to unconventional deposits of natural gas. The purpose of the work is to generalize data on the gas presence in the gas-coal fields of the Lviv-Volyn Coal Basin; to ascertain alterations of methane presence of the coal-bearing series across the area of the Lviv-Volyn Coal Basin.

We have analyzed gas-coal deposits of the Lviv-Volyn Coal Basin. General view of the change in methane presence across the area of the basin is the following:

– of the Volyn field seams of the Bashkirian stage have the least methane presence. Thus, for the seam b₃ it doesn’t exceed 0.1–1. cu m/t. dry ash-free mass (cu m/t. a.-f. m.), and for the seam b₁, it is equal to 0.2–3.0 cu m/t. a.-f. m.). The methane presence the Serpukhovian stage is higher and is changed within on a large scale from 0.01 to 3.0 cu m/t. a.-f. m. In the northern part of the basin, at the Volyn field the commercial coal seams have insignificant methane presence from 0.01 to 1.4 cu m/t. a.-f. m. Only is the far north-west it is increased up to 4–8 cu m/t. a.-f. m.;

– in the northern and north-eastern parts of the Zabuzhzhia field, the methane presence of coalbeds of the Serpukhovian stage is from 0.01 to 1. cu m/t. a.-f. m. With the increase in the depth of occurrence up to 500–650 m in the south-western part of the field, the methane presence increases to 2–10 cu m/t. a.-f. m. and at some plots it reaches 12–17 cu m/t. a.-f. m.;

– іn the Mezhyrichchia field the methane presence of the seams n₁₁, n₁₂, as well as of the main working seams of north-eastern part and along their outcrops into Carboniferous hardly reaches 3–5 cu m/t. a.-f. m. Characteristic of the field is that with increase of the depth of occurrence of beds from 380 to 450 m in the east and to 500–570 m in the west, the methane presence increases from 3–8 to 5–17 cu m/t. a.-f. m.;

– in the Tyagliv field, the methane presence of coalbeds reaches of its maximum and in the depth of 800–870 m it is from 8 to 31 cu m/t. a.-f. m. Тhe Tyagliv field is the most gas-bearing in the Lviv-Volyn Coal Basin;

– in the Lyubelya field, in its southern part, coal-bearing bearing series up to coal seam n₇ is degassed, and the methane content in the gas mixture is from 0 to 0.8 cu m/t. a.-f. m. In the northern direction of the field the methane presence increases to 5–15 cu m/t. a.-f. m., and in the seam v₆ up to 20 cu m/t. a.-f. m. at the mine fields No. 4 and No. 5.

To ascertain prospects of the areas for commercial extraction of coalbed methane it is necessary to take all geological factors, influencing the spreading and distribution of coal gases, into consideration. Complex approach to coal production with studying gas bearingness in the gas-bearing series is very important for the perspectiveness of the areas. The usage of such methods is one of the perspective directions of a stable development of coal-producing regions with gradual transfer from the monocentrified production to the multiprofile purposefulness.

Full Text

Keywords

gas bearingness, coal seam, gas-coal fields, complex approach, Lviv-Volyn coal basin

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Posted on November 2017May 2021 by GGCMJournal

DISTRIBUTION AND ORIGIN OF HYDROCARBON GASES IN COAL-BEARING DEPOSITS OF THE LVIV-VOLYN COAL BASIN

Home > Archive > No. 3-4 (172-173) 2017 > 87-105

Geology & Geochemistry of Combustible Minerals No. 1-2 (174-175) 2018, 87-105.

Mykhailo MATROFAILO, Iryna BUCHYNSKA, Andriy POBEREZHSKYY
Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, e-mail:igggk@mail.lviv.ua

Abstract

After sufficient study, generalizations of all the data available as to stratigraphy, tectonics, lithological composition of coal-bearing series of the basin from the point of view of its potential for gas presence was possible. The composition, nature of coal gases, forms of occurrence and the mode of their burial have been considered. Problems of generation of hydrocarbon gases in the process of coalification of organic substance and their abiogenic origin connected with subsurface processes of the Earth have been studied. The influence of reservoir properties of coal and coal-enclosing rocks, the composition and physical-mechanical features of the immediate roof and the foot of coal seams have been analysed, the dependence of the gas distribution in coal seams and coal-enclosing rocks upon disjunctive tectonic dislocations has been ascertained. The influence of intraformational and epigene washouts upon degassing of coal seams has been investigated. On the basis of construction of schemes of the gas presence in coal seams of some mine fields and on the whole basin the conclusions have been made about the methane distribution in coal-bearing series.
Materials on the assessment of methane resources of the gas-coal fields have been accumulated and systematized as well as the prospects of the modern natural gas presence in coal seams of the deep levels of the basin have been outlined. Optimum conditions of the formation of hydrocarbon gases accumulations have been cited. The conclusions have been made as to the modern extractive potential of gases of coal-bearing series of the Lviv-Volyn Basin as possible source of the improvement of the up-to-date state of the fuel-power complex of the Ukraine.

Full Text

Keywords

methane, gas presence, generation, migration, deposits, coal seam, gas-coal fields, resources, Lviv-Volyn coal basin.

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