Geology & Geochemistry of Combustible Minerals No. 3 (180) 2019, 90-99.
Ivanna KOLODIY, Halyna MEDVIDInstitute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv,
Distribution features of formation waters in Karkinit-Northern Crimean deep were studied; the conditions of chemical composition origin of formation waters have been studied as well.
The regional features for the distribution of formation waters and the conditions of their chemical composition forming of the Lower Cretaceous complex are established.
The formation waters are salty or saline and commonly have low metamorphism intensity.
The formation waters of the Lower Cretaceous complex are salt with often a low degree of metamorphosis.
The values of the variation coefficients of five principal components (mineralization, (Na + K), chlorine (Cl), bromine (Br), and the water sampling depths) are estimated to range from 28.73 to 57.14 %, which indicates insignificant variability each of these indicators; this characteristic does not depend on the type of water and place of sampling.
The seven objects of the correlation such as mineralization, chlorine, calcium, ammonium, bromine, sulfates and hydrocarbonates are closely associated with each other.
The land waters are commonly of calcium chloride (Cl.Ca) or hydrocarbonate natrium (Hyd.Car.Na) type, whereas in the water area all variety of formation waters has been recognized. Formation waters of Late Cretaceous shelf complex as well as formation waters at Tarkhankut peninsula have close relation between chemical components, low variations in the composition of macro- and microcomponents. Therefore, the formation waters of these regions could be formed in quite similar conditions.
The characteristic features of the shelf formation waters are high sulfate content, despite the fact that waters complex occurs at great depths.
At the same time, a decrease in the metamorphism intensity is observed as well as an increase in the Cl/Br ratio up to 1000 or more, caused by low bromine content. It is apparent that such characteristic can be the result of extrusion of water at the late stages of clay rocks dehydration. Paleoinfiltration processes in Lower Cretaceous complex may be considered as an alternative explanation.
High gas saturation in the waters of the folded basin bed has been recognized at Golytsyno area and at the Tarkhankut peninsula (Melova, Oktyabrska, Berezivska and Western Oktyabrska areas). This allows us to predict the prospects of the Lower Cretaceous sediments of the Karkinit-Northern Crimean deep.
Karkinit-Northern Crimean deep, Lower Cretaceous aquiferous complex, hydrogeochemical conditions, sedimentary waters, dissolved gases.
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