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
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