Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: re-evaluation

Sortuj według:

Ogranicz wyniki do:

Biostratigraphic re-evaluation of the lower to middle Miocene succession in the Eastern Carpathians : a case study related to the oil fields of the Diapir Fold Zone, Romania

Filipescu Sorin, Tămaş Dan M., Bercea Răzvan-Ionuţ, Tămaş Alexandra, Bălc Ramona, Ţabără Daniel, Bindiu-Haitonic Raluca, Silye Lóránd, Auer Andreea, Krézsek Csaba, Schléder Zsolt, Săsăran Emanoil

Geological Quarterly

2020

Vol. 64, No. 3

781--800

Romania has a long history of hydrocarbon production and tens of thousands of boreholes have penetrated Miocene strata. Many well cores or cuttings have been either lost or damaged, but lab reports containing valuable petrographic, paleontological and structural data are still available. Most of the knowledge of the subsurface relies on old descriptions and interpretations used by the oil industry. These data have not been recently updated, while research results from the last decade suggest potential changes in stratigraphy, especially for the lower to middle Miocene succession. In order to update, calibrate, and reduce uncertainties regarding the subsurface stratigraphic record, we have reviewed the lab reports and used equivalent field samples for an updated interpretation of the lower to middle Miocene succession. Core and cutting descriptions from boreholes covering an area of ~10,000 km2 in the Diapir Fold Zone of the Eastern Carpathians have been selected and biostratigraphically re-evaluated based on microfossils and calcareous nannofossils. In many cases, highly uncertain ages were previously interpreted as Oligocene and early Miocene. Our recent data suggest that most of the lower Miocene is either difficult to determine or has been reinterpreted as middle Miocene (e.g., Cornu and Doftana formations). This significant change in ages requires an updated model for the timing of regional structural evolution and may open new exploration opportunities in this highly mature hydrocarbon area. This study demonstrates the need for a new complete and reliable stratigraphic framework for the whole Miocene stratigraphic record of the Eastern Carpathians.

Ponowna ocena substancji dodatkowych przez EFSA i jej konsekwencje dla producentów żywności

Gajda-Wyrębek J., Jarecka J., Dmitruk M.

Przemysł Spożywczy

2018

T. 72, nr 9

26--31

Dodatki stosowane w produkcji żywności muszą być bezpieczne dla konsumenta. Obecnie w Unii Europejskiej trwa ponowna ocena ich bezpieczeństwa przez EFSA. Oceną są objęte dodatki dopuszczone do żywności przed 20.01.2009 r. Wyniki oceny poszczególnych substancji dodatkowych mogą być przyczyną zmian w ustawodawstwie UE. Program ponownej oceny powinien być zakończony do końca 2020 r., ale prawdopodobnie będzie trwał dłużej.

Food additives should be safe for the consumer. The programme for the re-evaluation by EFSA of food additives approved before 20th January 2009 is running nowadays in the EU. The results of the re-evaluation might have an impact on the EU legislation. The re-evaluation programme should be finalized up to 31st December 2020 but it seems that this deadline will be postponed.

Evolution of depositional systems and sedimentary cycles in Želiezovce Depression of the Danube Basin

Rybar S., Sarinova K., Sujan M., Halasova E., Hudackova N., Zlinska A., Kovac M., Kovacova M., Ruman A., Ledvenyiova L

Geology, Geophysics and Environment

2015

Vol. 41, no. 1

129

Five deep wells (Pozba4, Pozba3, Dubnik1, Nová Vieska1, Modrany1), drilled in the Želiezovce depression of the south-east Danube Basin penetrate the Cenozoic sedimentary record in overall thickness ranging from 1000 m up to 3000 m. The total thickness gradually increases from South to the North. This area is well known for the complex geological structure related to the Central Western Carpathians and Transdanubian Range junction along the Hurbanovo – Diösjenö line. Many authors have studied this area in the past, nevertheless depositional systems, sedimentary cycles and the development of sedimentary facies were never understood in detail. The re-evaluation of biostratigraphy, paleoecology, sedimentology and the reinterpretation of e-logs were all incorporated into well correlations, what resulted in definition of four main sedimentary cycles: (1) the lowermost Oligocene cycle, consisting of mudstones with occasional sandstone intercalations, associated with slope to offshore marine environment. The age is supported by the presence of the NP 22 calcareous nannoplankton zone; (2) the transgressive Langhian (Lower Badenian) deposits, composed of mudstones with epiclastic volcanic material and tuffite beds were associated with nearshore to offshore environement. The age is supported by the NN4–NN5 calcareous nannoplankton zone; (3) the Serravallian (Upper Badenian-Sarmatian) cycle is composed mainly of mudstones with abundant Lithothamnium fragments associated with brackish, coastal pain environment. The age is confirmed by the NN6 calcareous nannoplankton zone and by the mass occurrence of fish scales and Ervilia dissita (Eichwald) bivalves; (4) the overlying strata represent the Tortonian-Pliocene (Pannonian-Pliocene) cycle. The strata consist mostly from claystone (lake environment) which is overlain by sandstone and siltstone layers (deltaic and alluvial plain environments). The Tortonian (Pannonian) age of the lowermost claystone is supported by finds of Dreissenidae bivalves. The Pliocene age is only inferred by superposition of the strata.