Bezruchko K.А, Prykhodchenko O.V., Hladka M.O. The impact of folding on the formation of industrial gas content in sandstones under the conditions of Tomashevskyi domes

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Parent Category: Geo-Technical Mechanics, 2023

Category: Geo-Technical Mechanics, 2023, Issue 167

Geoteh. meh. 2023, 167, 25-34

https://doi.org/10.15407/geotm2023.167.025 

 

THE IMPACT OF FOLDING ON THE FORMATION OF INDUSTRIAL GAS CONTENT IN SANDSTONES UNDER THE CONDITIONS OF TOMASHEVSKYIDOMES

Bezruchko K.А, Prykhodchenko O.V., Hladka M.O.

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

UDC 551.243.3:[552.513:533.17]

Language: English

Abstract. Given the significant depletion of classic oil and gas fields, which include the majority of hydrocarbon resources in Ukraine, the search for additional alternative deposits of energy carriers is important. The purpose of the work is to analyze the conditions of the industrial gas content in the sandstones of the Tomashevskyi anticlinal structures. On the example of these structures (Northern and Southern domes), the authors considered conditions for the formation of industrial gas content in sandstones of the coal-bearing strata. The research was carried out by constructing a map of local structures with the application of trend analysis. According to the hypsometric plan of the coal bed, an approximating surface of the 1st order – a plane – is constructed. Based on the deviation of the actual hypsometric marks of the coal bed from the corresponding marks of the approximating surface, a map of local structures was constructed by the interpolation method. Anticlinal folds are highlighted in the plan and their main parameters – amplitude and width – are defined. Based on these structural parameters, the bending coefficients of the domes under the research were calculated. Subsequently, calculations of the critical thickness for sandstones were performed. The main factor of the industrial gas content in the domed parts of the Tomashevskyi anticlinal structures is the processes of cracking which entailed the formation of improved filtration-capacity properties of sandstones in the section of the coal-bearing stratum. According to the calculated data, in sandstones with high-thickness, over the critical thickness (from 9.8 m to 17.0 m), accumulations of coal methane were formed under the impact of folded deformations with an effective thickness from 2.4 m  to 14.9 m, in line with the actual data. Analysis of folding impact on the conditions of formation of the industrial gas content in sandstones under the conditions of Tomashevskyi domes proved the suitability of the method in predicting gas accumulations in local anticlinal structures for assessing the potential industrial gas content in ordinary 1st-order anticlinal structures. This method can be applied to search for gas deposits, both in positive structures of the 2nd-order (local), and 1st-order structures.
Keywords: hydrocarbons, coal-bearing strata, anticlinal structures, sandstones, gas accumulations.

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About the authors:

Bezruchko Kostiantyn Andriovych, Doctor of Geology Science (D.Sc.), Senior Researcher, Head of Department of Geology of Coal Beds at Great Depths, M.S. Poliakov Institute of Geotechnical Mechanicsof 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.

Prykhodchenko Oleksii Vasyliovych, Candidate of Geology Science (Ph.D.), Research Fellow of Department of Geology of Coal Beds at Great Depths, M.S. Poliakov Institute of Geotechnical Mechanicsof 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.

Hladka Maria Oleksandrivna, Engineer of Department of Geology of Coal Beds at Great Depths, M.S. Poliakov Institute o 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.

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