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A deep palaeovalley in the floor of Polish Carpathian Foredeep Basin near Pilzno and its control on facies of Badenian (Middle Miocene) evaporite facies

Głuszyński A., Aleksandrowski P.

Geological Quarterly

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2016

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Vol. 60, No. 2

493--516

EN

The Pogórska Wola palaeovalley of combined tectonic and erosional origin dissects the Mesozoic floor of the Carpathian Foredeep Basin to a depth exceeding 1200 m. It formed during Paleogene times presumably due to fluvial and submarine erosion, concentrated along a local pre-Late Badenian graben system. All members of the foredeep’s Badenian-Sarmatian sedimentary fill attain distinctly greater values inside the palaeovalley than on top of elevated plateaux on palaeovalley shoulders. The fill comprises the Early to Late Badenian sub-evaporite Skawina Formation, the laterally equivalent Late Badenian evaporite Krzyżanowice and Wieliczka formations and the supra-evaporite Late Badenian to Early Sarmatian Machów Formation. Over the plateaux and in the highest palaeovalley segment, the evaporites are developed in the sulphate facies Krzyżanowice Formation, whereas in the lower palaeovalley segments chloride-sulphate facies evaporites of the Wieliczka Formation occur. The rock salt-bearing rocks are involved in thrusting and folding at the Carpathian orogenic front, which helps to assess the lateral extent of the Wieliczka Formation in seismic records. The deep palaeotopographic position of the evaporites inside the palaeovalley, combined with their lithological and sedimentary features, point to their formation via subaqueous gravity flow-driven redeposition of originally shallow-water evaporites, preferentially halite-bearing, presumably combined with precipitation from sulphate and chloride brines at the palaeovalley floor. Both the redeposited sediments and the brines must have come from the adjacent plateaux and from a thrust-sheet top basin, approaching from the south on top of the Cretaceous-Paleogene Carpathian flysch thrust wedge.

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Geometria i ewolucja wybranych struktur solnych z obszaru Niżu Polskiego w świetle danych sejsmicznych

Krzywiec P.

Przegląd Geologiczny

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2009

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Vol. 57, nr 9

812-812

EN

Permo-Mesozoic Mid-Polish Trough formed eastern segment of the Southern Permian Basin, within which thick series of the Upper Permian (Zechstein) evaporites, including rock salt, have been deposited. During subsidence phase the presence of thick salt series led to regional decoupling between sub-salt basement and supra salt Mesozoic sedimentary cover, and to development of various salt structures. Evolution of salt pillows and diapirs was genetically related to activity of the basement fault zones. The Goleniów, Dzwonowo-Człopa, Damasławek, Mogilno, Kłodawa and Lubień salt diapirs have been analyzed using conventional seismic reflection data acquired during petroleum exploration, and - in case of Damasławek and Lubień diapirs - shallow high-resolution seismic data. Interpretation of available seismic data gave new insight into geometry of these salt structures, finally shaped during Late Cretaceous-Palaeogene inversion of the Mid-Polish Trough and partly modified during younger (Neogene- Quaternary) phases of their tectonic activity.

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Modele sejsmiczne mioceńskich pułapek strukturalnych i stratygraficznych nasyconych węglowodorami w zapadlisku przedkarpackim

Zientara P., Jóźwiak W.

Biuletyn Państwowego Instytutu Geologicznego

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2005

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nr 416

133-151

PL

Skonstruowano dwa dwuwymiarowe modele wybranych pułapek gazonośnych w utworach miocenu zapadliska przedkarpackiego. Obecność gazu ziemnego obniża prędkości fal sejsmicznych. Modelowano obraz sejsmiczny zmieniając wielkość obniżenia prędkości spowodowanego występowaniem gazu, a także liczbę warstw zawierających gaz. Modelowano sekcje sejsmiczne zerooffsetowe, jak i zapisy polowe, które następnie przetworzono na sekcje sejsmiczne. Pokazano, jak wskaźniki występowania gazu ziemnego przejawiają się w zapisie sejsmicznym, w warunkach charakterystycznych dla pułapek mioceńskich zapadliska przedkarpackiego.

EN

Two 2-D models of selected gas traps in Miocene strata of the Carpathian Foredeep were constructed. The occurrence of natural gas lowers the velocity of seismic waves. Seismic images were modelled for varioces by variouses magnitudes of the lowering of seismic wave velocity. The number of gas-bearing layers was also different. Zero-offset seismic sections as well as field records were modelled. Field records were subsequently processed to seismic sections. It was shown how gas indicators manifest themselves on seismic images in conditions characteristic of Miocene trap structures of the Carpathian Foredeep.

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Budowa frontalnej strefy Karpat zewnętrznych na przykładzie mioceńskiej jednostki Zgłobic w rejonie Brzeska–Wojnicza-nowe dane, nowe modele, nowe pytania

Krzywiec P., Aleksandrowski P., Florek R., Siupik J.

Przegląd Geologiczny

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2004

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Vol. 52, nr 11

1051--1059

EN

Pilot interpretation of selected new seismic profiles located within the Miocene Zgłobice Unit [Polish Outer Carpathians, Brzesko-Wojnicz area] allowed us to set up a new tectonic model of the Carpathian front in this area, in many respects different from the previously proposed ones. The central part of the Zgłobice Unit is interpreted as a passive-roof duplex defining a Miocene triangle zone. Above the duplex, in the roof of the triangle zone, major synclinal folds are recognised in the Miocene deposits and attributed to shortening in the hanging wall of the frontal roof backthrust of the duplex. Some of the inferred tectonic structures are classified as syn-depositional, coeval with sedimentation of the upper portion of the post-evaporitic siliciclastic foredeep succession [Grabowiec Beds]. Three main types of hydrocarbon traps are identified within the Zgłobice Unit and within the sedimentary infill of deep palaeovalleys developed within the Mesozoic basement. Because of pilot character of the interpretation here discussed, some of the solutions proposed in this paper should be regarded as working hypotheses, requiring further, more detailed studies. The latter should include detailed stratigraphic investigations in the key structural elements of the Zgłobice Unit, applying advanced techniques of seismic data processing [pre-stack depth migration, structural seismic modelling] and acquisition of shallow high-resolution seismic images. In order to better understand the geometry and kinematics of the interpreted linked thrust system, application of quantitative balancing techniques will be necessary.