Tag: hydrogeochemistry

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HYDROGEOLOGICAL CONDITIONS OF OIL AND GAS OCCURRENCE AND ECOLOGICAL-GEOCHEMICAL CHARACTERISTICS OF THE SURFACE AND SUBSURFACE HYDROSPHERE OF THE BORYSLAV-POKUTTYA OIL AND GAS REGION

Home > Archive > No. 1 (201) 2026 > 37–50

Geology & Geochemistry of Combustible Minerals No. 1 (201) 2026, 37–50

ISSN 0869-0774 (Print), ISSN 2786-8621 (Online)

https://doi.org/10.15407/ggcm2026.201.037

Halyna MEDVIDa, Vasyl HARASYMCHUKb, Olha TELEHUZc, Ivanna KOLODIYd, Solomiia KALMUKe, Iryna SAKHNIUK f

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

a https://orcid.org/0000-0002-5059-245X
b https://orcid.org/0000-0002-4377-2655
c https://orcid.org/0000-0001-5761-7528
d https://orcid.org/0000-0002-6879-1051
e https://orcid.org/0000-0002-1350-9696
f https://orcid.org/0009-0000-6700-1532

Abstract

The interaction between geological structures and the hydrosphere in the process of hydrocarbon accumulation has been investigated. It has been established that the hydrogeochemical characteristics of aquifers in the Boryslav-Pokuttya oil and gas region are primarily determined by paleohydrogeological evolution and the degree of hydrogeological isolation. The geochemical composition of reservoir waters reflects a complex paleohydrogeological history, while hydrochemical zonation is disrupted by local inversions caused by tectonic, hydrodynamic, and geochemical processes, as well as by varying levels of aquifer system isolation.

Indirect hydrogeochemical indicators of oil and gas potential in the region include: high mineralization and metamorphism of waters, chloride-sodium or chloride-calcium-sodium composition, enrichment with trace elements and microcomponents, reduced sulfate content.

Gas-hydrogeochemical analysis revealed distinct patterns in the distribution of water-dissolved gases within productive complexes. “Dry” gases are typical of Oligocene–Miocene deposits at depths of 2600–3600 m, medium “dry” gases occur in Eocene–Miocene deposits (1200–4900 m), while “fat” gases (Ks < 50) are present throughout the productive section.

Geobaric features include superhydrostatic reservoir pressures in both aquifers and productive reservoirs, with maximum pressures located in the vaulted parts of folds overlain by thick clayey Miocene cover. Oil and gas fields exhibit a wide range of hydrostatic coefficient values, though hydrocarbon accumulations most often occur in areas with hydrostatic reservoir pressures. Deposits with high Kh generally contain smaller reserves, reflecting the limited elastic volume of reservoirs and fluids.

Groundwater in the Boryslav-Pokuttya oil and gas region predominantly belongs to the hydrocarbonate-calcium type. Exceedances of sanitary-chemical safety and drinking water quality standards were recorded for total hardness, permanganate oxidation, chloride concentration, and total dissolved salts, with occasional excesses in nitrate levels.

Surface waters of the district are mostly of hydrocarbonate-calcium composition, though individual samples of chloride-sodium, sulfate-sodium, and, less frequently, magnesium types were identified. Deviations from standards were observed in biochemical oxygen demand over 5 days (BOD5), dissolved oxygen, and permanganate oxidation indicators.

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Keywords

hydrogeology, paleohydrodynamic, hydrogeochemistry, gas hydrogeochemistry, oil and gas accumulations, surface and groundwater

Referenses

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Received: January 16, 2026
Accepted: February 19, 2026
Published: April 21, 2026

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PALEO- AND EXISTENT HYDROGEOLOGICAL CONDITIONS OF THE BILCHE-VOLYTSA ZONE OF THE CARPATHIAN OIL- AND GAS-BEARING PROVINCE

Home > Archive > No. 2 (179) 2019 > 68-83

Geology & Geochemistry of Combustible Minerals No. 2 (179) 2019, 68-83.

https://doi.org/10.15407/ggcm2019.02.068

Vasyl HARASYMCHUK, Halyna MEDVID, Maria KOST, Olha TELEGUZ

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

Abstract

On the basis of paleo- and modern hydrogeological sings it was possible to establish a space-time mechanism of formation and reservation of gas and oil deposits in the Bilche-Volytsa zone of the Carpathian oil- and gas-bearing province.

The time interval of their forming applies on the last cycle of the hydrogeological time. Geodynamic and secondary geostatic loadings, that manifested themselves during the dynamo-elision stage (Late Badenian – up to the present) the development of which was caused by thrust motions of the covers, turned out to be the factors of migration of aqueo-hydrocarbon mixtures deep underthrust structures of the Inner zone. Time calculations for reservation of deposits of gas fields have determined their age which does not exceed 6 million years.

The south-western trend of motion of paleo- and modern infiltration waters in combination with reversed dynamo-elision have caused here the existence hydrodynamically balanced system squeezed between them which differs by favourable conditions for the formation and reservation of hydrocarbon deposits.

We have ascertained the connection between piezomaxima and areas of tectonic dislocation, mainly transverse, that points out the ways of transsference of hydrocvarbon mixtures from deep-seated horisons. Discharge areas (perspective on a plane of searching for new deposits) are limited by local piezomaxima on the background of regional fields. Areas of paleopiezominima in the near-fault part of the Ugerske-Kosiv blocks at the boundary with the East European Platform are favourable for localization of hydrocarbon deposits.

Results of the baroosmotic analysis of hydrogeological conditions of gas and oil fields have revealed baroosmotic flows of waters molecules in the thickness of clay rocks, their intensity and directions of motion and connections with deposits.

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Keywords

Bilche-Volytsya oil- and gas-bearing zone, paleohydrodynamics, hydrogeochemistry, elision, infiltration, baroosmose.

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