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

• Autorzy: 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

Identyfikatory

DOI

10.7306/gq.1554

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

biostratigraphy; re-evaluation; Carpathian Bend Zone; Miocene; microfossils

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2020
• Tom: Vol. 64, No. 3
• Strony: 781--800
• Opis fizyczny: Bibliogr. 98 poz., fot., rys., wykr.

Twórcy

autor

Filipescu Sorin

• Babeş-Bolyai University, Department of Geology and Research Center for Integrated Geological Studies, 1 Kogălniceanu St., 400084 Cluj-Napoca, Romania

autor

Tămaş Dan M.

• Babeş-Bolyai University, Department of Geology and Research Center for Integrated Geological Studies, 1 Kogălniceanu St., 400084 Cluj-Napoca, Romania

autor

Bercea Răzvan-Ionuţ

• S.N.G.N. Romgaz S.A., 23 Salcâmilor St., 540202, Târgu-Mureş, Romania

autor

Tămaş Alexandra

• Durham University, Stockton Road, DH1 3LE Durham, United Kingdom

autor

Bălc Ramona

• Babeş-Bolyai University, Department of Environmental Science, Fântânele 30, 400294 Cluj-Napoca, Romania

autor

Ţabără Daniel

• “Al. I. Cuza” University, Department of Geology, 20A Carol I Blvd., 700505 Iaşi, Romania

autor

Bindiu-Haitonic Raluca

• Babeş-Bolyai University, Department of Geology and Research Center for Integrated Geological Studies, 1 Kogălniceanu St., 400084 Cluj-Napoca, Romania

autor

Silye Lóránd

• Babeş-Bolyai University, Department of Geology and Research Center for Integrated Geological Studies, 1 Kogălniceanu St., 400084 Cluj-Napoca, Romania

autor

Auer Andreea

• OMV Aktiengesellschaft, 6-8 Trabrennstrasse, 1020 Vienna, Austria

autor

Krézsek Csaba

• OMV Petrom, 22 Coralilor, 013329 Bucharest, Romania

autor

Schléder Zsolt

• OMV Aktiengesellschaft, 6-8 Trabrennstrasse, 1020 Vienna, Austria

autor

Săsăran Emanoil

• Babeş-Bolyai University, Department of Geology and Research Center for Integrated Geological Studies, 1 Kogălniceanu St., 400084 Cluj-Napoca, Romania

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).