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PROSPECTS FOR OIL AND GAS PRESENCE OF LOWER SARMATIAN DEPOSITS IN THE NORTH-WESTERN PART OF THE OUTER ZONE OF THE CARPATHIAN FOREDEEP (by hydrogeochemical and hydrodynamic indicators)

Home > Archive > No. 3–4 (185–186) 2021 > 16–32


Geology & Geochemistry of Combustible Minerals No. 3–4 (185–186) 2021, 16–32.

https://doi.org/

Halyna MEDVID, Olga TELEGUZ, Vasyl HARASYMCHUK, Maria KOST’, Solomiya KALMUK

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

Abstract

The hydrogeochemical parameters of the Lower Sarmatian aquifer of the north-western part of the Outer Zone of the Carpathian Foredeep have been studied. The waters of the chloride-calcium type (according to the classification of V. O. Sulin) are dominated. Other types of water are distributed locally. On the basis of the calculated genetic coefficients, the conclusion on sedimentogenic conditions of their forming during a geological history of the region is made.

It is established that the general tendency for the deposits of the Outer Zone is increasing of TDS of water with depth and stratigraphy. The waters of the north-western part of the Outer Zone are characterized by reduced values of sulfate content and sulfation coefficient rSO42– · 100/rCl, indicating the conditions of hydrogeological closed structures.

The genetic index of formation water metamorphism (rNa+/rCl) is mainly inversely dependent on TDS. Its values greater than one are inherent in waters of hydrocarbonate-sodium and sulfate-sodium types, which are not typical for the hydrocarbon deposits. The nature of fluctuations in the values of the chlorine-bromine coefficient is fully consistent with other hydrochemical parameters and the results of paleohydrodynamic reconstructions.

A detailed analysis of the current hydrodynamic situation of Lower Sarmatian aquifer in combination with geochemical features and paleohydrodynamic reconstructions allowed to identify the perspective structures of the studying region. Our forecasts for the gas potential of the Krukenychy depression are consistent with the forecasts of researchers of Ivano-Frankivsk National Technical University of Oil and Gas. The results of their research are based on gravitational field anomalies.

Keywords

hydrogeological criteria, hydrogeochemical features, hydrocarbons, Outer Zone, Carpathian Foredeep

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GEOCHEMICAL CHARACTERISTIC OF RIVER AND GROUND WATERS (OUTER ZONE OF THE PRECARPATHIAN DEEP)

Home > Archive > No. 1 (182) 2020 > 76-86


Geology & Geochemistry of Combustible Minerals No. 1 (182) 2020, 76-86.

https://doi.org/10.15407/ggcm2020.01.076

Maria KOST’, Halyna MEDVID, Vasyl HARASYMCHUK,Olga TELEGUZ, Iryna SAKHNYUK, Orysia MAYKUT

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

Abstract

Geochemical peculiarities of river and groundwaters of the Outer zone of the Precarpathian deep have been established. It is revealed that the main feature of the distribution of salt composition indicators in the Dniester River and its influxes is hydrochemical zonality, which does not depend on the flow direction of the rivers, but is consistent with the physics-geographical and geological features of the area to which the man-made factor is imposed.

There is an increase in concentrations of sulfate, calcium in the left bank confluent of the river Shchyrka. The waters from the Tysmenytsya, Kolodnitsa and Dniester rivers in the village Kolodrubi are characterized by the highest amounts of sodium and chlorides and are sodium chloride-hydrocarbonate composition. The water composition of the Dniester River (Rozvadiv village), its confluents Bystrytsia and Letnyanka are hydrocarbonate calcium (sodium-magnesium-calcium), Shchyrka, Vereshchitsa – sulfate-hydrocarbonate calcium (magnesium-calcium). The index of biochemical oxygen consumption for 5 days in the waters of Tysmenytsya River reached 4.5 mg O2/dm3, while in other rivers it was 0.70‒3.20 mg O2/dm3. The content of O2 soluble in the waters of the river Vereshchytsya was 0.29 mg/dm3, the value of biochemical oxygen consumption was 11.4 mg O2/dm3.

In the chemical composition of river waters, there is an increase in the concentrations of sodium, potassium and chloride ions from the left bank to the right bank confluents of the Dniester. In the left-bank confluents, in the chemical composition of water dominate the contents of calcium and hydrocarbons ions.

The heterogeneity of the lithological composition, the instability of the thickness of the aquifer both in the horizontal and vertical directions, and the different technogenic influence form the irregularity of pollution and its local distribution in groundwater.

Keywords

river waters, groundwaters, geochemical features, geochemical zonality, Outer zone, Precarpathian deep.

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