Tag: hydrogeology

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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/

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

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

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GEOCHEMICAL PECULIARITIES OF THE AQUIFER COMPLEX OF THE VELYKI MOSTY GAS FIELD

Home > Archive > No. 3-4 (172-173) 2017 > 76-86

Geology & Geochemistry of Combustible Minerals No. 3-4 (172-173) 2017, 76-86.

Halyna MEDVID, Maria KOST’, Olga TELEHUZ, Roman PANKIV, Olena PALCHYKOVA, Orysya MAJKUT, Iryna SAKHNYUK

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

Abstract

Macro- and microcomponent chemical composition of reservoir waters of the Cambrian, Devonian, Carboniferous aquifer complex of the Velyki Mosty gas field and surface water of the Upper Cretaceous sediments are studied. Changes of basic genetic parameters of the ground water with the depth and in the space are analyzed, hydrogeochemical conditions of their origin are found and the coefficient of the hydrogeological closing of bowels is calculated .

Formation waters of the Cambrian and Devonian complex have high salinity, low sulfurity and chlorine-bromine factor and belong to the chloride-calcium type with high degree of the metamorphism. Groundwater of the Carboniferous period is characterized by lower salinity, high sulfurity and hydrocarbonate-sodium type. It was found that Cambrian and Devonian aquifers are zones of delayed water exchange according the coefficient of closing of structures and Carboniferous aquifer is a zone of considerable water exchange.

Surface water of the Upper Cretaceous sediments are unleavened, slightly alkaline with hydrocarbonate calcium composition. High values permanganate oxidizability in the waters of the river indicate the impact of the technogenesis. Hydrocarbonate calcium composition of drinking water from Senon-Turonian horizon of the Upper Cretaceous indicates no impact of deep water.

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Keywords

hydrogeology, ecology, Velyki Mosty gas field, aquifer complex, coefficient of closing of structures, groundwater and surface water.

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