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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.

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Keywords

Transcarpathian Foredeep, foundation, tectonics, faults, cover units

Referenses

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MARMAROSH KLIPPEN BELT IN STRUCTURE OF UKRAINIAN CARPATHIANS Article 2. Tectonic-magmatic position and views of the zone structure

Home > Archive > No. 2 (179) 2019 > 55-67

Geology & Geochemistry of Combustible Minerals No. 2 (179) 2019, 55-67.

https://doi.org/10.15407/ggcm2019.02.055

Mykhaylo YAREMOVYCH

ТзОВ «Геол-тех», Львів, e-mail: mishayaremovich@gmail.com

Abstract

The paper describes the tectonic position of Marmarosh zone of rocks and determine its place in the structure of the Ukrainian Carpathians. Shown is the history of the study of igneous rocks. The comparative analysis of the views on the structure and position of the Marmarosh klippen belt in the structure of the Carpathians processed by the literature was carried out. At the end of the article the researchers compared views on the structure of Foreign Affairs, highlighted the main features of the geological structure and tectonic zoning area.

Some similar features of  rocks composed of Marmarosh klippen belt, namely formational, to a lesser extent, the morphology of the folded and dislocations with a break of continuity history of even-aged species of complexes the Marmarosh zone of rocks is considered as NW continuation of Marmarosh massif that was torn from its substratum in the tectonic evolution of the region. These tectonic elements of different times and different phases of folding, but the final phase of tectonogenesis was manifested are almost simultaneously during the Miocene. MKB is a special category of tectonic structures associated with faults, of considerable length and long stage of development, is so-called near-fracture or suture structures and delineates two different areas with sharply different geological development history, geodynamic conditions of formation, stratified formations, independent tectonic regime. The structure is characteristed by the set of formations – sedimentary, igneous, metamorphic.

As a result of structural and tectonic studies the Marmarosh klippen belt is a consequence of Albian movements where appeared blocky dislocation and Post-Oligocene folding and formation of small intrusive bodies. Modern look of the band was formed in Oligocene time at neotectonic stage of development of the Carpathians. MKB is not correlated with any of the Carpathians area, although it has similarities with some elements, such as Marmarosh massif, but it different by a character of section and especially by peculiarity of the section of the Lower Cretaceous.

One of the conditions for further study of Marmarosh klippen belt is integrated research, including the study of facies changes of the nature of the thickness, more mapping of folded and discontinuous structures, further development of stratigraphic scheme of the area, the analogy of even-aged sediments and similar genesis formations of adjorning the territories both on the – territory and abroad of Ukraine. In this comprehensive analysis the Marmarosh klippen belt may get a proper understanding of its nature and place in the structure of folded Carpathians.

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Keywords

Marmarosh klippen belt, tectonics, overthrust, landslide, nappe, olistostrome, horst-anticlinorium, magmatism, ophiolite complexes.

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