Criteria for assessment of hydrocarbon saturation of compact sand-aleurite rocks under DDB conditions
Introduction. In the modern period, the increase in the resource base is largely associated with the exploration of deposits that are under development. The latter process includes the study of non-traditional reservoirs, among which of considerable interest are compacted sand-silt rocks.
Steady growth in raw material consumption has led to the search for alternative sources of hydrocarbons. The development of the industry is aimed at studying existing deposits with the introduction and involvement of the latest, advanced technologies. In this regard, the development of this area is relevant. Undoubtedly, the search for hydrocarbons in compacted sand-silt rocks within the Dnieper-Donetsk basin will develop.
Purpose. To propose the main geological criteria for detecting hydrocarbon saturation of compacted rocks, which are accompanied by certain indicators.
Analysis of previous works. Until recently, information on compacted hydrocarbon-unsaturated sand-silt rocks was most often found only in foreign publications. In the 60's of the XX century, employees of UkrNDIgaz tried to study in detail the compacted hydrocarbon-saturated rocks, but at that time this area was not developed. These studies are associated with the names of Mukharinskaya I, Kharchenko S, Lagutina A. In recent decades, issues regarding compacted sand-siltstone rocks in Dnieper-Donetsk basin have been considered during gas-type gas research. Until recently, the detection of gas in compacted rocks was of a general nature and was not substantiated by actual material.
Presenting main material. The nature of the compacted sand-silt varieties is very diverse. Due to the peculiarities of lithological packs, compacted rocks should be considered both separately and in combination with direct contact with traditional reservoir rocks.
Scientific and theoretical research and factual material allow us to identify promising stratigraphic complexes in terms of hydrocarbon saturation in compacted sand-silt rocks. Compacted sand-siltstone rocks acquire the greatest development within the Lower Permian-Upper Coal and Middle-Lower Coal complexes.
The main criteria for detecting compacted rocks should be considered the degree of saturation of rocks and the nature of hydrocarbons. Consider the indicators that characterize these two processes.
Due to the fact that geological criteria and their indicators (a kind of indicator) often interact, complement each other and are "hostages" of causal processes.
Conclusions. The proposed criteria are based on a number of geological indicators, such as ascending migration of hydrocarbons, features of lithological composition, conditions of conversion of imported and own organic matter, low water content of the stratum. The activity of most processes, which are indicators of the proposed basic criteria of oil and gas, are accompanied by an increase in the temperature of the local zone of development of compacted sand-silt rocks.
In one of these zones the connection of temperature anomaly with the main indicators of prospects for oil and gas bearing capacity of compacted sand-silt rocks is considered.
One of the methods of practical detection of the degree of hydrocarbon saturation in compacted sand-silt rocks, especially in the zone of elevated temperatures, can be a direct method of geological-gas-geochemical research, based on the simultaneous study of geological properties and gas-geochemical features.
Khrol, V.V. (2017). To the method of detection of compacted hydrocarbon-saturated rocks (on the example of the southern riparian zone of the Dnieper-Donetsk basin). Visnyk of V.N. Karazin Kharkiv National University, series "Geology. Geography. Ecology", 46, 62-66 [in Ukrainian]. https://doi.org/10.26565/2410-7360-2017-46-08
Vakarchuk S.G., Dovzhok T.YE., Filyushkin K.K., Kabyshev Yu.B., Hladun V.V., Kholodnykh A.B (2013). Unconven-tional hydrocarbon resources of Ukraine. Monohrafiya. Kiev: Nika-center [in Ukrainian].
Lukin A.E (2011). On the nature and prospects of gas-bearing capacity of low-permeability rocks of the Earth's sedimentary shell. Report. NAS of Ukraine [in Ukrainian].
Kabyshev B.P., Shpak P.F., Bilyk O.D. et al. (1989). Geology and oil and gas content of the Dnieper-Donetsk de-pression (oil and gas content) Kiev: Naukova Dumka, 204 [in Ukrainian].
Lurie A.I.. (2018) Geothermal anomalies and oil and gas content. Monograph. Kharkiv [in Ukrainian].
Khrol V.V., Lurie A.Y. (2020). Low water content is one of the criteria for carbohydrate reduction of low-water grain-aleurite rocks. VI Scientific conference with international participation "Hydrogeology: science, education, practice. Kharkiv, 90-93 [in Ukrainian].
Lukin A.E. (2011). On the nature and prospects of gas content of low-permeability rocks of the sedimentary shell of the Earth. Report. Ukraine, 114-123 [in Ukrainian].
Lukin A.E. (2010). Shale gas and the prospects for its production in Ukraine. Article 1. The current state of the problem of shale gas (in the light of the experience of developing its resources in the United States) Geological Journal. 3, 17–33 [in Ukrainian].
Tereshchenko V.O. (2016). Unconventional sources of hydrocarbon raw materials: a textbook. Navchalʹnyy posibnyk of V.N. Karazin Kharkiv National University, Kharkiv, 52-60 [in Ukrainian].
Vysochansky I.V. (2013). Geological factors of formation of non-vault traps in special zones of oil and gas accu-mulation of the Dnieper-Donetsk avlacogen. Visnyk of V.N. Karazin Kharkiv National University, series "Geology. Geography. Ecology", 39, 45-65 [in Ukrainian].
Pomerants L.I. (1982). Gas logging. Nedra, 29-77 [in Russian].
Povyeryennyy S.F., Lurie A.I. (2020). On the formation of secondary porosity in the deposits of great depths of the south-east of the Dnieper-Donetsk basin. Visnyk of V.N. Karazin Kharkiv National University, series "Geology. Geography. Ecology", 53, 45-60 [in Ukrainian]. DOI: https://doi.org/10.26565/2410-7360-2020-53-03
Suyarko V.G., Ishchenko L.V. (2015). Geochemical criteria for hydrocarbon exploration in the east of the Dnieper-Donetsk basin. Visnyk of V.N. Karazin Kharkiv National University, series "Geology. Geography. Ecology", 43, 88-93 [in Ukrainian]. DOI: https://doi.org/10.26565/2410-7360-2015-43-13
Suyarko V., Lysychenko G., Zagnitko V., (2017). On structural-geochemical criteria for forecasting hydrocarbon accumulations. Geology and geochemistry of combustible minerals., 1-2, 173 [in Ukrainian].
Suyarko V.G. Fyk M.I, Baranovskaya N.Yu. (2012). Geological features of shale gas development in the conditions of Donetsk folded structure. Visnyk of V.N. Karazin Kharkiv National University, series "Geology. Geography. Ecology", 1033, 54-58 [in Ukrainian].
Lukin A.E. (1977). Formations and Secondary Changes in Carboniferous Deposits of the Dnieper-Donetsk Basin in Connection with Oil and Gas Potential. Moscow: Nedra, 102 [in Russian].
Zinenko I.I., Zaritsky А.Р. (1992). Deep zones of gas accumulation DDB. Oil and Gas Industry, 1, 12-15 [in Ukrainian].
Lebedev B.A. (1992). Geochemistry of sedimentary processes in sedimentary basins. Nedra, 239 [in Russian].
Soloviev V.O., Fyk І.М., Varavin Е.Р. (2013). Unconventional sources of hydrocarbons: problems of their develop-ment: textbook. National Technical University Kharkiv Polytechnic Institute, 92 [in Ukrainian].
Kabishev B.P., Lowe В.Е., Prygarina Т.М., Kabyshev Y.B. (2000). Prospects of DDВ for unconventional gas of the central basin type. Oil and gas and gas industry, 2, 8-11 [in Ukrainian].
Mayevsky B.Y., Benko V.M., Zderca T.V., Kurovets S.S. (2008). On the question of the development of lithogenetic fracturing and oil and gas bearing capacity of deeply submerged terrigenous rocks-collectors of the Pre-Carpathian Depression and the Dnieper-Donetsk depression. Geoinformatics, 4, 21-24 [in Ukrainian].
Lagutin A.A., Poverennyy S.F. (2002). Formation conditions and lithophysical properties of reservoir rocks of the deep-lying productive horizon B 25 26 Kotelevskoe field according to core study data. Supply of gas industry de-velopment in Ukraine. Issue XXX. Kharkiv, 69 75 [in Ukrainian].
Doluda M. Ye, Litvin S.V., Kharchenko S.D. (1968). Regional epigenesis of the Carboniferous deposits of the Dnie-per-Donetsk depression and its influence on reservoir properties. Lithology and useful minerals, 4 [in Russian].
Lagutin A.A., Lytvyn S.V., Likhvan V.M. (1999). Analysis of the results of calculating gas reserves at different stag-es of development of the Vilkhiv field. Questions of development gas industry of Ukraine. Nedra, 27, 87-91 [in Ukrainian].
Benko V.M., Maevsky B.Y., Lagutin A.A, Khomin V.R., Mayevsky B.J. (2013). Peculiarities of geological structure and prospects of oil and gas potential of deep-submerged horizons of the Dnieper-Donetsk depression. Mono-graph Ivano-Frankivsk National Technical University of Oil and Gas 208, 192-206 [in Ukrainian].
Wickstrom L., Perry C., Riley K., Erenpreiss M. (2012). The Utica-Point Pleasant Shale Play of Ohio. Ohio Depart-ment of Natural Resources Division of Geological Survey Presentation. Annual Convention and Exhibition, Long Beach, California, 41-58 [in USA].