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Wyświetlanie 1-3 z 3
Tytuł:
Znaczenie przepływów hiperpyknalnych i klinoform deltowych dla interpretacji sedymentologicznych formacji z Machowa (miocen zapadliska przedkarpackiego
Hyperpycnal flows and deltaic clinoforms - implications for sedimentological interpretations of late Middle Miocene fill in the Carpathian Foredeep Basin
Autorzy:
Porębski, S.J.
Warchoł, M.
Powiązania:
https://bibliotekanauki.pl/articles/2074464.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
miocen
przepływ hiperpyknalny
klinofroma deltowa
zapadlisko przedkarpackie
Carpathian Foredeep
Miocene
hyperpycnal flow
shelf-margin delta
Opis:
The Middle to early Upper Miocene Machów Formation represents the youngest and little to non-deformed increment in the Carpathian Foredeep Basin that was initiated during the Paleocene in response to thrust loading of the North European craton. The onset of the Machów Formation was associated with the late Badenian (lateMiddle Miocene) flexural subsidence (ca 12.5 Ma BP) that resulted in underfilled-basin conditions recorded in the emplacement of submarine fans and shelf-margin deltas, up to 400 m in relief. These systems were fed from the south by a net of small, suspended-load dominated rivers, which resulted in the strongly heterolithic nature of the basin infill. There is a striking absence of large-scale traction structures, and thick sandstone/mudstone packages intercalated with thick-bedded massive sandstones provide evidence of deposition mainly from sustained turbidity currents typified by oscillations in velocity and sediment concentration within a flow. The evidence in both submarine-fan and delta-front deposits includes the abundance of climbing ripples, thick flat-laminated intervals within the otherwise massive thick-bedded sandstones, and inverse to pensymmetrical grading associated with a succession of structural divisions, which departs from that generated by harmonic energy dissipation typical for surge-type (semi-constant volume) turbidity currents. This evidence is interpreted to reflect deposition mainly from hyperpycnal flows, whose oscillatory behaviour reflected chiefly changing flood stages in the sourcing fluvial flow. The inferred semi-permanent flow feeding is also supported by the very high sedimentation rate (locally up to 24 cm/a) of the Machów Formation. Four clinoform types have been distinguished in the formation. Type 1 is most common and corresponds to platform (“shallow-water”) deltas of subseismic scale. The remaining three are shelf-margin (“deepwater”) deltas. The latter types differ one form another in the height and internal structure of clinoforms, as well as in the degree of downdip segregation of sand that either dominates in slope increments (type 2), forms shingled clinoform toes (type 3), or is concentrated in basin-floor fans in the front of a muddy clinoform slope. The basinward sand segregation is facilitated by the dissection of a clinoform’s top during the maximum fall in relative sea level and by long slopes that ease the transformation of hyperpycnal flows into high-efficiency turbidity currents. Numerous internal onlap unconformities make the shelf-margin deltas interesting targets for hydrocarbon search in stratigraphic traps. The identified type 4 clinoforms, up to 200 m high, in the Quinqueloculina reusii zone point to a major deepening in the upper part of the Machów Formation. This suggests a rise in flexural accommodation at ca 11 Ma BP, and contradicts the common view on uniform upward-shallowing throughout the formation.
Źródło:
Przegląd Geologiczny; 2006, 54, 5; 421-429
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silurian shales of the East European Platform in Poland : some exploration problems
Autorzy:
Porębski, S.J.
Prugar, W.
Zacharski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2075023.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Silurian
black shale
shale gas
unconventional play
czarne łupki
gaz łupkowy
niekonwencjonalna gra
Opis:
The pericratonic Silurian shale succession in Poland, despite its reasonably well-constrained geological framework, entails a number of contentious issues that need to be resolved before this emerging shale gas play will enter a stage of successful development. The succession is thought to have originated in a Caledonian foredeep encroaching distally onto a pericratonic shelf ramp. However, the geochemical signature of the mudrocks is consistent with a cratonic rather than orogenic sourcing, the proximal part of the foredeep basin-fill is apparently missing, and the shale succession juxtaposes in part across the Teisseyre-Tornquist Zone against suspected terranes with no evidence of Silurian tectonism. Organic-rich Llandovery– Wenlock shales form a NW-SE striking central belt that is increasingly calcareous toward the craton (NE) and more silty toward the inferred orogen (SW), with the TOC content decreasing in both directions perpendicular to the strike. The TOC trend seems consistent with the deep-downlap model of black shale deposition suggested for many Paleozoic foredeep basins, but does not quite agree with the outer neritic to upper bathyal depths assumed for the shale deposition. Preliminary results from three wells drilled by Orlen Upstream in the Lublin Basin indicate that the Llandovery–Wenlock shales were deposited on a distal shelf ramp sheltered from the craton by shelf carbonate shoals and periodically affected by weak storm-generated currents. The impact of storms on water column resulted in intermittent rises of oxygen content in the otherwise anoxic to dysoxic near-bottom conditions. The prospective interval is dominated by calcite-cemented clayey mudstones showing moderate to good reservoir qualities. It is cut locally by ENE- or NE-dipping, steep fractures favourable for fluid transmissibility, and a NE or SWdirection is most advantageous for artificial fracturing. This interval is capped with a Ludlow calcite-cemented, laminated siltstone that forms a regional correlation marker and shows soft-sediment deformations attributable to gravitational collapse on a NE-dipping paleoslope. If correct, this interpretation might imply the encroachment of orogen-fed clinothem system onto the SW-inclined craton-margin shelf ramp.
Źródło:
Przegląd Geologiczny; 2013, 61, 11-1; 630-638
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Łupki sylurskie platformy wschodnioeuropejskiej w Polsce : wybrane problemy poszukiwawcze
Silurian shales of the East European Platform in Poland : some exploration problems
Autorzy:
Porębski, S.J.
Prugar, W.
Zacharski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2075081.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Silurian
black shale
shale gas
unconventional play
sylur
ciemne łupki
gaz łupkowy
niekonwencjonalna gra
Opis:
The pericratonic Silurian shale succession in Poland, despite its reasonably well-constrained geological framework, entails a number of contentious issues that need to be resolved before this emerging shale gas play will enter a stage of successful development. The succession is thought to have originated in a Caledonian foredeep encroaching distally onto a pericratonic shelf ramp. However, the geochemical signature of the mudrocks is consistent with a cratonic rather than orogenic sourcing, the proximal part of the foredeep basin-fill is apparently missing, and the shale succession juxtaposes in part across the Teisseyre-Tornquist Zone against suspected ter- ranes with no evidence of Silurian tectonism. Organic-rich Llandovery-Wenlock shales form a NW-SE striking central belt that is increasingly calcareous toward the craton (NE) and more silty toward the inferred orogen (SW), with the TOC content decreasing in both directions perpendicular to the strike. The TOC trend seems consistent with the deep-downlap model of black shale deposition suggested for many Paleozoic foredeep basins, but does not quite agree with the outer neritic to upper bathyal depths assumed for the shale deposition. Preliminary results from three wells drilled by Orlen Upstream in the Lublin Basin indicate that the Llandovery-Wenlock shales were deposited on a distal shelf ramp sheltered from the craton by shelf carbonate shoals and periodically affected by weak storm-generated currents. The impact of storms on water column resulted in intermittent rises of oxygen content in the otherwise anoxic to dysoxic near-bottom conditions. The prospective interval is dominated by calcite-cemented clayey mudstones showing moderate to good reservoir qualities. It is cut locally by ENE- or NE-dipping, steep fractures favourable for fluid transmissibility, and a NE or SW direction is most advantageous for artificial fracturing. This interval is capped with a Ludlow calcite-cemented, laminated siltstone that forms a regional correlation marker and shows soft-sediment deformations attributable to gravitational collapse on a NE-dippingpaleoslope. If correct, this interpretation might imply the encroachment of orogen-fed clinothem system onto the SW-inclined craton-margin shelf ramp.
Źródło:
Przegląd Geologiczny; 2013, 61, 8; 468--477
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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