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QUANTITATIVE INDEX OF TOC CONTENT OF DIFFERENT AGE THICKNESSES OF TRANSCARPATHIAN DEPRESSION AS OIL GAS GENERATION ESTIMATION CRITERIA

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Geology & Geochemistry of Combustible Minerals No. 1 (178) 2019, 41-46.

цифровий ідентифікатор DOI цієї статті

Andrii Andriiovych LOKTIEV

ТзОВ «Компанія «Геопошук ЛТД», смт Рожнятів, Івано-Франківська обл.,
e-mail: shon327@hotmail.com

Abstract

The Transcarpathian foredeep of Ukraine is a geological unit within the Carpathian folded structure, presented by Neogene molasses, which cover Pre-Neogene folded base.

Five deposits of combustible gas were discovered within the foredeep – Russko-Komarivske, Stanivske and Korolevskoye within the Mukachevo depression and Solotvino and Dibrovske fields within the Solotvino depression. Despite the fact that most domestic researchers adhere to the view of gas migration along deep tectonic faults into the sedimentary cover of the Transcarpathian foredeep, it is important to analyze the basin for favourable conditions for the generation of natural gases within the sedimentary cover.

Samples of core material, selected from 57 intervals of different age complexes of rocks from Transcarpathian wells for quantitative estimation of total organic carbon in rock, were analyzed in the department of sedimentary strata of IGGCM NASU. The results of the studies indicate the presence of rocks with low as well as good and even very good oil and gas potential for total organic carbon content, which are overwhelmingly related to the deposits of Pre-Neogene folded base. In general, a wide range of TOC content is established by the analysis. Rocks with TOC content of more than 1% are found both in rocks of the Pre-Neogene base (w. № 22-, 23-Solotvino, 1-Bushtinska, 1-Borodivsko-Novosilska), and in the molar thickness of the Neogene (St. No. 1-Velyko-Dobronska, 8-Tyachivska), which indicates sufficient content to generate hydrocarbons.

Further research aimed at determining the oil and gas potential will allow to determine the priority directions of oil and gas exploration within the Transcarpathian foredeep.

Keywords

gas, generation, migration, Transcarpathian foredeep, field, source rocks, TOC.

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