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THE GEOCHEMICAL CRITERIA OF CONNECTION OF HYDROCARBON DEPOSITS WITH EVAPORITES AND SEDIMENTARY FORMATIONS OF PHANEROZOIC (ON THE EXAMPLE OF OIL AND GAS BEARING BASINS OF CENTRAL AND EASTERN EUROPE)

Home > Archive > No. 3-4 (172-173) 2017 > 56-75


Geology & Geochemistry of Combustible Minerals No. 3-4 (172-173) 2017, 56-75.

Serhiy VOVNYUK, Anatoliy HALAMAY, Sophia HRYNIV, Ihor DUDOK, Sophia MAKSYMUK, Andriy POBEREZHSKYY, Daria SYDOR, Iaroslava IAREMCHUK

Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, е-mail: igggk@mail.lviv.ua

Abstract

Based on the results of mineralogical, petrological and fluid inclusion studies of Phanerozoic evaporates and sedimentary deposits the geochemical criteria of connection of hydrocarbons with evaporite and sedimentary formations have been defined. The study of fluid inclusions containing hydrocarbons has been conducted; the peculiarities of hydrocarbon gases distribution in subsurface sedimentary rocks and their possible connection to potential deep hydrocarbon deposits have been studied in regions of hydrocarbon deposits occurrence; the interaction between organic matter and clay minerals has been studied on the example of evaporate and terrigenous deposits of Carpathian region; the geochemistry of processes of vein minerals forming of different structural zones of Carpathians has been studied in relation to oil- and gas-bearing.

Based on geochemical study of peculiarities of fluid inclusions in halite we can reconstruct PT parameters of alteration and migration of hydrocarbons. The criteria of the hydrocarbon deposits prognosis are as follows: occurrence of bitumen bubbles (or droplets of oil with the hard bitumen crust) in fluid inclusions in halite together with elevated content of methane (above 50 %) and other hydrocarbon gases in inclusions. For the reliable estimation of oil and gas deposits occurrence in the underlying rocks it is important to have correlation between the results of complex geochemical study of fluid inclusions and bitumens in salt.

The direct features of oil and gas bearing (fields of anomalous concentrations of hydrocarbon compounds) determined in subsurface sedimentary complexes allow us to outline prioritized fields of potential hydrocarbon accumulation. The use of gas-geochemical method of study in complex oil and gas prospecting works allows to increase their effectiveness.

It is important to keep in mind during prospecting works for hydrocarbons that trapping of organic compounds (including gases) by interlayer space of clay minerals (in particular smectite) impacts the gas production ability of clay strata.

 Mineralogical and geochemical studies of vein formations in sedimentary complexes show that Crosno and Duklya zones and Marmarosh crystalline massive are the most promising oil- and gas-bearing regions of the Eastern Carpathians.

The determined geochemical criteria of hydrocarbon deposits occurrence allow increasing the effectiveness of prospecting works for oil and gas.

Keywords

sedimentary formations, evaporites, Phanerozoic, hydrocarbons, fluid inclusions in halite, geochemical anomalies, clay minerals, vein formations.

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GEOCHEMICAL ASPECTS OF THE PROCESSES OF HYDROCARBON MIGRATION AND ACCUMULATION OF THE UKRAINE’S OIL- AND GAS-BEARING REGION

Home > Archive > No. 3-4 (172-173) 2017 > 9-28


Geology & Geochemistry of Combustible Minerals No. 3-4 (172-173) 2017, 9-28.

Olesya SAVCHAK

Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, e-mail: igggk@mail.lviv.ua

Abstract

The Eastern oil- and gas-bearing region of Ukraine is the youngest one as regards the discovery of commercial hydrocarbon deposits and the greatest one in terms of volume of explored reserves and hypothetical resources. It is confined to the Dnieper-Donets Depression. There were more then 240 hydrocarbon deposits discovered here. We have analyses the geochemical composition of oil and condensate for 3 main structural-tectonic elements of the region: northern, southern edges and depression, as well as we have carried out comparative analysis of the composition of natural hydrocarbons within the limits of the region. The analysis of the peculiarities of geological structure and oil and gas presence together with available geochemical data has made it possible to come to a conclusion about that the formation of oil and gas deposits in the Eastern oil- and gas-bearing region was caused both by lateral and vertical migration of hydrocarbons.

Keywords

geochemical features, migration, hydrocarbons, Eastern oil- and gas-bearing region of Ukraine.

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Savchak, O. Z. (2016). Heokhimichnyi aspekt protsesiv mihratsii vuhlevodniv Skhidnoho naftohazonosnoho rehionu Ukrainy. In Perspektyvy naroshchuvannia resursnoi bazy naftohazovoi enerhetyky: Mizhnarodna naukovo-tekhnichna konferentsiia (25–27 travnia 2016 r.) (pp. 104–106). Ivano-Frankivsk. [in Ukrainian]

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