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The earliest Cretaceous carbonate platform destroyed by volcanism from the Ukrainian/Romanian Carpathians – reconstruction based on microfacies

Iwańczuk Joanna, Krobicki Michał, Feldman-Olszewska Anna, Hnyłko Oleh

Geotourism / Geoturystyka

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2023

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nr 1-2 (72-73)

31--31

EN

There is a unique tectonostratigraphic unit called Kaminnyi Potik occur in the Ukrainian-Romanian Carpathian transborder zone. In the Ukrainian part numerous outcrops of this unit can be observed in many streams near Rachiv city, but its most spectacular occurrence is in the Chyvchyn Mountains. The whole complex consists of volcanogenic-sedimentary rocks and is divided into two Berriasian formations: Chyvchyn and Kaminnyi Potik. In the section of the Chyvchyn Formation, at the base, there are pillow lavas (basalts and andesites/trachyandesites) and volcano-sedimentary breccia with clasts of lava, coral limestones and radiolarites (submarine debris flows), and peperites as well. The Kaminnyi Potik Formation is made up of fine-grained hyaloclastic and carbonate debris flows of a flysch character (including organodetrital limestones with fragments of: corals, bryozoans, echinoderms bivalves and foraminifera), which overlying breccias and coral limestones of the Chyvchyn Formation. The profile ends by thin-bedded cherty limestones. The thin sections analysis revealed the following microfacies: oolithic-echinoderm packstone/grainstone; coral lithoclastic quartz packstone/grainstone; oolithic-lithoclastic wackestone/packstone; lithoclastic-echinoderm packestone; lithoclastic packestone; radiolarian echinoderm packestone; radiolarian wackestone; radiolarian-calpionellid wackestone and mudstone. Pyroclastic material is often present in the matrix. The ooids observed in the thin sections and the remains of fauna such as corals, echinoderms and bivalves suggest that the original material came from a carbonate platform that was sheltered by a coral reef. As a result of volcanic eruptions and possibly accompanying earthquakes, the platform has been destroyed and its traces are visible in clasts. Sedimentological character of submarine debris flows, (e.g. fractional graiding, mixture of shallow-water fauna and lithoclasts with deep-marine microfauna (radiolarians and calpionellids) and hyaloclastic material present in the matrix document short-term episodes of a catastrophic nature, leading to the redeposition of shallow-water sediments to the deeper parts of the basin.

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Polsko-Słowacka Grupa Robocza Systemu Jurajskiego (2011–2021) : pierwsza sekcja jurajska afiliowana przy dwóch narodowych towarzystwach geologicznych

Wierzbowski Andrzej, Feldman-Olszewska Anna

Przegląd Geologiczny

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2022

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Vol. 70, nr 4

341--45

EN

The Polish-Slovak Working Group of the Jurassic System was founded in 2012 as the continuation of the activity of the Polish Working Group of the Jurassic System established in 1999. The Group has been officially approved by and affiliated as the thematic section at the two national societies - the Polish Geological Society and the Slovak Geological Society. The foundation of the section resulted from growing integration of the Polish and Slovak geological researches, especially in the Carpathians placed at the border of the two states. This resulted in further arrangement of joint studies in that area, and the organization of six new field meetings (JURASSICA), four of them dedicated to the Carpathian Jurassic. The newly arranged meetings included: the JURASSICA IX (2011) at Małogoszcz, south-western Mesozoic margin of the Holy Cross Mts., central Poland; the JURASSICA X (2012) in the Pieniny Klippen Belt of the Transcarpathian Ukraine; the JURASSICA XI (2014) at Sławno, north-western Mesozoic margin of the Holy Cross Mts., central Poland; the JURASSICA XII (2016) at the Smolenice Castle in Malé Karpaty mountain range, south-western Slovakia; the JURASSICA XIII (2017) at Zakopane, Tatra Mts. at the Polish and Slovak state border; and the JURASSICA XIV (2019) in Bratislava, with excursions to the western sector of the Pieniny Klippen Belt in Slovakia. The close cooperation with the Berriasian Working Group of the International Commission on Stratigraphy of IUGS, and participation of many foreign geologists, gave the meetings an international character, being the place of exchange of studies and ideas connected with a widely treated “Jurassic” geology. The special field-guides included the abstracts of presentations and explanations to the geology of the particular areas edited on the occasion of the meetings (the last ones in English, indicated in the references below). Because of the COVID-19 pandemic the meeting has not been arranged for the last two years, but the forthcoming one is planned at Iłża, north-eastern Mesozoic margin of the Holy Cross Mts., in 2023. We hope that the future meeting will be an occasion for a wider cooperation with geologists working in the Jurassic System not only of our two states but also in other countries.

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Prospective zones of unconventional hydrocarbon reservoirs in the Cambrian, Ordovician and Silurian shale formations of the East European Craton marginal zone in Poland

Podhalańska Teresa, Feldman-Olszewska Anna, Roszkowska-Remin Joanna, Janas Marcin, Pachytel Radomir, Głuszyński Andrzej, Roman Michał

Geological Quarterly

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2020

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Vol. 64, No. 2

342--376

EN

The paper presents the latest state of knowledge on the vertical and lateral ranges and characteristics of prospective zones (PZ) within the Lower Paleozoic unconventional hydrocarbon systems in the Baltic-Podlasie-Lublin Basin (Poland). The PZ were identified within the prospective formations based on rigorously determined criteria with the application of stratigraphic, sedimentological, mineralogical, petrographic, geochemical, petrophysical, and geomechanical studies, and interpretations of borehole logs. Archival geological data and information acquired from boreholes drilled recently in concession areas have also been applied in the interpretations. Following these criteria, four prospective zones have been distinguished. The deposits encompass partly or almost completely the Piaśnica, Sasino, and Jantar formations and the lower part of the Pelplin Formation. The characteristic feature of the Lower Paleozoic deposits at the East European Craton (EEC) margin in Poland is the diachronous appearance of the Sasino and Jantar black shale formations from west to east. The Baltic area is most prospective for the occurrence of unconventional hydrocarbon reservoirs in shale formations, specifically the Łeba Elevation, where all 4 prospective zones have been distinguished. The occurrence of liquid and gaseous hydrocarbons is expected in all zones. Due to the very high TOC content and geochemical characteristics, the Piaśnica Formation within PZ1 is the main petroleum source rock in the Polish part of the Baltic Basin. PZ2 (partly corresponding to the Sasino Formation) present in a large part of the Baltic Basin, is the next important prospective unit, despite not being uniform. PZ3 within the Jantar Formation was distinguished only on a limited area of the Łeba Elevation. Due to the low content of organic matter, the Lublin area is characterized by the lowest hydrocarbon potential. However, low values of that parameter are compensated by a greater thickness and lateral range of PZ4, partly corresponding to the Pelplin Formation. Comparison with other areas within the Lower Paleozoic Baltic Basin reveals the occurrence of shale deposits that may constitute a potential source of hydrocarbons, and that demonstrate diachronism. Towards the east and south-east, ever younger deposits possess the potential for hydrocarbon accumulations. In Poland, in the western part of EEC, these are: the Furongian and the Lower Tremadocian Piaśnica Formation, the Sandbian and Katian Sasino Formation and the Lower/Middle Llandovery (Rhuddanian and Aeronian) Jantar Formation. In the central part of the Baltic Basin (Lithuania), these are the Upper Ordovician and Aeronian shale successions. In the southeastern part of the basin (Ukraine), the Ludlow strata are considered to be the most promising in terms of the potential unconventional hydrocarbons accumulations.

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Ropa naftowa i gaz ziemny w Polsce – obszary perspektywiczne oraz postępowanie przetargowe w 2018/2019 r.

Feldman-Olszewska Anna, Jankowski Leszek, Krzyżak Ewelina, Peryt Tadeusz, Sikorska-Jaworowska Magdalena, Wójcik Krystian

Przegląd Geologiczny

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2019

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Vol. 67, nr 1

13--26

EN

On the 28th of June 2017, the Polish Ministry of the Environment announced the boundaries of the 15 tender areas selected for the third licensing concession round for prospection, exploration and exploitation of hydrocarbons. In this paper we describe the areas located in the south-eastern (Ryki) and southern Poland (Proszowice W, Rudnik-Lipiny, Błażowa and Wetlina). The other areas have already been described in the previous issue of the Przegląd Geologiczny. The exploration target of the Ryki area is related to conventional gas deposits in the Upper Devonian and Carboniferous, as well as to unconventional tight gas deposits in the Frasnian carbonates. Prospects in the tender areas located in southern Poland are related to conventional oil and gas deposits in the Carpathians, Carpathian Foredeep and their Paleozoic-Mesozoic basement.