GEOCHEMICAL CHARACTERISTICS AND THERMAL MATURITY OF THE UPPER DEVONIAN ROCKS (DNIEPER-DONETS BASIN) ACCORDING TO ROCK-EVAL PYROLYSIS DATA (EXPLORATION DRILLING)
DOI:
https://doi.org/10.17721/1728-2713.107.03Keywords:
Devonian, kerogen, pyrolysis, sourse rock, hydrocarbons, Dnieper-Donetsk basinAbstract
Background. In the Dnieper-Donets Basin (DDB), Devonian deposits are a very interesting object of hydrocarbon system research – from the initial stage of hydrocarbon generation to the stage of formation of oil and gas deposits. The presence of sedimentary layers enriched with scattered organic matter determines the oil and gas generation potential of the deposits. The article presents the results of laboratory studies of Upper Devonian rocks performed on the Rock-Eval pyrolytic tool in order to assess their thermal maturity and degree of hydrocarbon generation.
Methods. Laboratory studies were carried out by the method of pyrolysis of rock samples (Rock-Eval) with the determination of a number of parameters that allow for the assessment of thermal maturity, the type of organic matter (kerogen) and the coefficient of organic matter transformation. Data processing was performed using the methods of mathematical statistics.
Results. An important result of the research is the established regularity that shales and limestones with an increased content of organic carbon (TOC) of the Famennian layer from between-salt strata in this part of the DDB are already in the active phase of oil generation and belong to oil-source rocks. Precisely in this part of the Dnieper-Donets depression the main explored reserves of liquid hydrocarbons in the Eastern region are concentrated.
Conclusions. Generalized conclusion based on the results of the above studies: most samples of shales (argillites) and limestones have quite high concentrations of organic carbon; the thermal maturity of the rocks for 63 % of the samples corresponds to the "oil window"; all four types of kerogen are present in the rocks; the best oil-generating properties are characteristic of shales from between-salt strata; also, these shales have the maximum degree of realization of the generating potential TRI – more than 0.3 at depths of 4,700 m. The results of the above studies indicate that the shales and limestones of the Frasnian and Famennian layers from the studied deposits can be considered as potential oil-source rocks.
References
Eisenberg, D. E., Berchenko, O. I., & Brazhnikova, N. E. (1988). Stratigraphy. Vol. 2. Naukova dumka [in Russian]. [Айзенберг, Д. Е., Берченко, О. И., & Бражникова, Н. Е. (1988). Стратиграфия. Т. 2. Наукова думка].
Izart, A., Sachsenhofer, R., Privalov, V., Elie, M., Panova, E., Antsiferov, V., … & Zhykalyak, V. (2006). Stratigraphic distribution of macerals and biomarkers in the Donets Basin: Implications for paleoecology, paleoclimatology and eustacy. International Journal of Coal Geology, 66(1–2), 69–107. https://doi.org/10.1016/j.coal.2005.07.002
Karpenko, I. O. (2018). Petroleum system of the Dnieper-Donets basin. Part 1: Southern pre-board zone. Lambert Academic Publishing [in Ukrainian]. [Карпенко, І. О. (2018). Нафтогазова система Дніпровсько-Донецької западини. Ч. 1: Південна прибортова зона. Lambert Academic Publishing].
Karpenko, O., Bashkirov, G., & Karpenko, I. (2014). Determination of the content of organic matter in rocks based on geophysical data. Visnyk of Taras Shevchenko National University of Kyiv. Geology, 3(66), 71–76 [in Ukrainian]. [Карпенко, О., Башкиров, Г., & Карпенко, І. (2014). Визначення вмісту органічної речовини в гірських породах за геофізичними даними. Вісник Київського національного університету імені Тараса Шевченка. Геологія, 3(66), 71–76.
Karpenko, O. M., Krochak, M. D., & Baisarovych, I. M. (2017). Actual problems of petroleum geology. VPC "Kyiv University" [in Ukrainian]. [Карпенко, О. М., Крочак, М. Д., & Байсарович, І. М. (2017). Актуальні проблеми нафтогазової геології. ВПЦ "Київський університет"].
Khomenko, V. A. (1986). Devonian of the Dnieper-Donets Basin. Naukova dumka [in Russian]. [Хоменко, В. А. (1986). Девон Днепровско-Донецкой впадины. Наукова думка].
Lukin, O. (2006). Devonian of the Dnieper-Donets avlakogen (tectonicsedimentary complexes, formations, genetic types of deposits and lithogeodynamics). Geological journal, 2–3. 26–46 [in Ukrainian]. [Лукін, О. Ю. (2006). Девон Дніпровсько-Донецького авлакогену (тектоно-седиментаційні комплекси, формації, генетичні типи відкладів та літогеодинаміка). Геологічний журнал, 2–3, 26–46].
Menning, M., Alekseev, A. S., Chuvashov, B. I., Davydov, V. I., & Devuyst, X. (2006). Global time scale and regional stratigraphic reference scales of Central and West Europe, East Europe, Tethys, South China, and North America as used in the Devonian-Carboniferous-Permian Correlation Chart 2003 (DCP 2003). Palaeogeography, Palaeoclimatology, Palaeoecology (Elsevier), October 6, Vol. 240, Is. 1–2, 318–372. https://doi.org/10.1016/j.palaeo.2006.03.058.
Misch, D., Sachsenhofer, R., Bechtel, A., Gratzer, R., Grob, D., & Makogon, V. (2015). Oil/gas-source rock correlations in the Dnieper-Donets Basin (Ukraine): New insights into the petroleum system. Marine and Petroleum Geology, 67, 720–742. https://doi.org/10.1016/j.marpetgeo.2015.07.002.
Mykhailov, V. A., Vakarchuk, S. G., Zeykan, O. Yu., Kasyanchuk, S. V., Kurovets, I. M, & Vyzhva, S. A. et al. (2014). Unconventional sources of hydrocarbons of Ukraine. Book 8: Theoretical substantiation of unconventional hydrocarbon resources of sedimentary basins of Ukraine. Nika Center [in Ukrainian]. [Михайлов, В .А., Вакарчук, С. Г., Зейкан, О. Ю., Касіянчук, С. В., Куровець, І. М., & Вижва, С.А. та ін. (2014). Нетрадиційні джерела вуглеводнів України. Кн. 8. Теоретичне обґрунтування ресурсів нетрадиційних вуглеводнів осадових басейнів України. Ніка-центр].
Ratnayake, A. S., Kularathne, C. W., & Sampei, Y. (2018). Assessment of hydrocarbon generation potential and thermal maturity of the offshore Mannar Basin, Sri Lanka. Journal of Petroleum Exploration and Production Technology, 8, 641–654. https://doi.org/10.1007/s13202-017-0408-1.
Sachsenhofer, R., Popov, S., Coric, S., Mayer, J., Misch, D., & Morton, M. (2018). Paratethyan petroleum source rocks: an overview. Journal of Petroleum Geology, 41 (3), 219–245. https://doi.org/10.1111/jpg.12702
Sachsenhofer, R., Privalov, V., Zhykalyak, M., Bueker, C., Panova, E., Rainera, T., Shymanovskyy, V., & Stephenson, R. (2002). The Donets Basin (Ukraine/Russia): coalification and thermal history. International Journal of Coal Geology, 49(1), 33–55. https://doi.org/10.1016/S0166-5162(01)00063-5.
Sachsenhofer, R., Shymanovskyy, V., Bechtel, A., Gratzer, R., & Horsfield, B. (2010). Palaeozoic source rocks in the Dniepr–Donets basin, Ukraine. Petroleum Geoscience, 16(4), 377–399. https://doi.org/10.1144/1354-079309-032
Stryzhak, V. P., & Korzhnev, P. M. (2012). Peculiarities of the Devonian deposits structure and oil and gas capacity of the northwestern part of Dnieper-Donets avlakogen. Tectonics and Stratigraphy, 39, 43–56 [in Ukrainian]. [Стрижак, В. П., & Коржнев, П. М. (2012). Особливості будови та нафтогазоносності девонських відкладів північно-західної частини Дніпровсько-Донецького авлакогену. Тектоніка і стратиграфія, 39, 43–56].
Tissot, B. P., & Welte, D. H. (1984). Petroleum Formation and Occurrence. Springer-Verlag. https://doi.org/10.1007/978-3-642-87813-8
Waliczek, M., Machowski, G., Poprawa, P., Świerczewska, A., & Więcław, D. (2021). A novel VRo, Tmax, and S indices conversion formulae on data from the fold-and-thrust belt of the Western Outer Carpathians (Poland). International Journal of Coal Geology, 234, 1 February, 103672. https://doi.org/10.1016/j.coal.2020.103672
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