Home > Archive > No. 3–4 (195–196) 2024 > 24–35
Geology & Geochemistry of Combustible Minerals No. 3–4 (195–196) 2024, 24–35
https://doi.org/10.15407/ggcm2024.195-196.024
Kostyantyn HRIGORCHUK1, Volodymyr HNIDETS2, Oksana KOKHAN, Lina BALANDYUK
Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, Ukraine, e-mail: 1kosagri@ukr.net; 2vgnidets53@gmail.com
Abstract
The paper presents the results of complex lithogenetic studies of the Middle Jurassic deposits of the Predobrogean depression. The nature of the lithological-lithmological space-age variability of the Callovian and Bath-Bajocian deposits was established, lithophysical models were built on this basis, and the peculiarities of the development of reservoir rocks of various types and aquitards were clarified. In the lithological structure of the Middle Jurassic, three types of section are distinguished according to the ratio of rock components. It was established that the lithological structure of the Callovian and Bath-Bajocian deposits is significantly different: clayey, as well as siltstone-sand litmites are characteristic of the Bath-Bajocian, and mixed and terrigenous litmites with a carbonate component are characteristic of the Callovian. The lateral lithological and lithological heterogeneity of the sediments indicates that the studied profiles cross several facies zones. Two clastogenic packs of regional distribution were identified in the section of the Bath-Bajocian in the lower and middle parts of the section, 55–60 m and 50–240 m thick, respectively, separated by a pack of clay formations. The Callovian deposits are characterized by the development of mixed litmites, to a certain extent enriched in carbonate rocks. Three oil and gas promising areas have been localized. First, this is the district of Well Suvorivska-4, where the development of a combined (anticlinal and lithologically limited) trap is predicted in the Callovian deposits. Secondly, the area between Well Chervonoarmiyska-2 and Suvorivska-4, where 10 horizons of both pore and fracture reservoirs are wedged in the Bath-Bajocian deposits. The third is the district of Well Starotroyanivska-1, where there is a anticlinal trap with the development in the Bath-Bajocian deposits of two horizons of pore collectors, which are shielded by rather powerful aquitards.
Keywords
deposits of the Middle Jurassic, litho-lithmological features, reservoir rocks, Predobrogean depression
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