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A NEW MODEL OF THE FORMATION OF THE FOUNDATION OF THE TRANSCARPATHIAN FOREDEEP (in the context of prospects for oil and gas presence)

Home > Archive > No. 3–4 (195–196) 2024 > 5–23


Geology & Geochemistry of Combustible Minerals No. 3–4 (195–196) 2024, 5–23

https://doi.org/10.15407/ggcm2024.195-196.005

Volodymyr SHLAPINSKYI1, Myroslav PAVLYUK2, Olesya SAVCHAK3, Myroslav TERNAVSKYI4

Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, Ukraine, e-mail: 1vlash.ukr@gmail.com; 2igggk@mail.lviv.ua; 3Savchakolesya@gmail.com; 4miroslavtmm@gmail.com

Abstract

In the Transcarpathian Foredeep, the foundation rocks are not exposed on the day surface. They are available for study only based on the results of drilling in the post-war period or geophysical research. Over the entire long period of time, two hundred and fifty wells were drilled in the Transcarpathian Foredeep on twenty-two structures, with a total area of more than two hundred thousand meters. The deep drilling of one hundred and seventy thousand meters (about seventy wells) was carried out on ten structures. Five gas fields have been discovered within the foredeep. Thanks to this, the existence of the Transcarpathian gas-bearing region was established, which entered the boundaries of the Carpathian oil and gas-bearing province. All gas fields known here are localized in the Neogene cover. Meanwhile, one should not ignore the prospects and the not yet sufficiently studied pre-Neogene foundation. Fissured and cavernous limestones and dolomites of the Triassic and Jurassic, as well as terrigenous sediments of the Cretaceous and Paleogene have satisfactory reservoir properties (open porosity 10 % and higher). Significant inflows of combustible gas were recorded in a number of wells. Unfortunately, due to the complexity of the structure of the foundation of the Transcarpathian Foredeep and due to insufficient coverage of it by drilling and geophysical research, ideas about its geological structure cannot be considered satisfactory, unlike the Neogene cover. Therefore, improving knowledge about the structure of the foundation is of great practical importance. Due to the fact that new drilling operations are not currently being conducted to open the foundation, we have tried to rethink the existing geological factual material available to us through its in-depth analysis. As a result, a fundamentally new scheme of tectonic zoning of the foundation of the Transcarpathian Foredeep was proposed. In its composition, we have identified cover units (covers, sub-covers and scales), which better reflects the real state of affairs than existing schemes and expands the possibilities of carrying out exploration work in order to discover industrial accumulations of combustible gas in it.

Keywords

Transcarpathian Foredeep, foundation, tectonics, faults, cover units

Referenses

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

Home > Archive > No. 1 (178) 2019 > 41-46


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

https://doi.org/10.15407/ggcm2019.01.041

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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