Yu.V. Khokha, GEOCHEMICAL CHARACTERISTICS AND GASES EVOLUTION HISTORY OF PARTICULAR DEPOSITS OF THE DNIPRO-DONETSK DEPRESSION
https://doi.org/10.15407/mineraljournal.46.04.054
UDC 550.426:553.98(477)
GEOCHEMICAL CHARACTERISTICS AND GASES EVOLUTION HISTORY
OF PARTICULAR DEPOSITS OF THE DNIPRO-DONETSK DEPRESSION
Yu.V. Khokha, DrSc (Geochemistry), Leading Researcher
E-mail: khoha_yury@ukr.net; orcid:0000-0002-8997-9766
Ya.G. Lazaruk, DrSc (Geology), Major Researcher
E-mail: lazarukjaroslav@gmail.com; orcid:0009-0002-2016-3424
M.B. Yakovenko, PhD (Geochemistry), Senior Researcher
E-mail: myroslavakoshil@ukr.net; orcid:0000-0001-8967-0489
Institute of geology and geochemistry of combustible minerals of NAS of Ukraine
3-a, Naukova Str., Lviv, Ukraine, 79060
Language: Ukrainian
Mineralogical journal 2024, 46 (4): 54-70
Abstract: The results of the geochemical analysis of the gases evolution in the deposits of the Dnipro-Donetsk depression within the boundaries of various tectonic elements are presented. Applied methods of thermodynamic modeling, statistics and geochemical coefficients. The initial data for the calculations are 203 results of the analysis of free and dissolved gases in oil from seven deposits. Measurement time range: 1966-2018. The range of depths: from 1758 m to 5587 m. The coefficients i-С4/n-С4, Ln(C1/C2), Ln(C2/C3), C1(reduced) were used to estimate general trends. The ratio of C2/C3 to C2/i-C4 was used to assess conversion trends in the gas/solid matter system. The ratio of i-C4/n-C4 to normalized methane was used as an indicator of thermal maturity. The volume of methane generated by kerogen and the depth of formation of equilibrium mixtures were calculated using thermodynamic methods. With the help of correlation analysis, the structure of interrelationships between components, parameters, and coefficients was revealed, and the most significant connections were highlighted. It was established that, regardless of depth, age and tectonic affiliation, the gases of the considered deposits have the same origin — they are the product of kerogen evolution. It was found that the traps of the Movchanivskyi and Vodianivskyi deposits were filled with gas either from many sources or in multiple stages. The productive stratum of the Novomykolaiv deposit was saturated with gases during a short interval of geological time. Over time, the calorific value of gases and the Wobbe number in deposits gradually decrease.
Keywords: hydrocarbon gases, evolution of organic matter, geochemical coefficients, Dnipro-Donetsk basin.
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