engleski

Shoreline cross-bedded biocalcarenites (Middle Miocene) in the Podvrško-Šnjegović area, Mt. Psunj, and their petroleum significance (Požega Subdepression - eastern Croatia)

The extensively distributed bioclastic sedimentary bodies in the Podvrško- Šnjegović area, Mt. Psunj (Požega Subdepression, eastern Croatia) are mostly composed of fragments the fragments of bryozoans, echinoids, lamellibranchs and corallinaceans. Apart from this, more or less uniform in composition, but granulometrically variable bioclastic detritus occur, which also contain a smaller proportion (5-30%) of siliciclastic grains of medium-size to coarse sand, as well as sporadic pebbles up to 60 mm in diameter. These sediments are characterised by remarkably large-scale cross-bedding with erosional surfaces clearly delimiting the sets. They are interpreted as shallow-marine shoreface subaqueous dunes, sand bars and barriers formed on the nearshore - mainly shoreface area during the Late Badenian age in a high-energy depositional cycle and strong synsedimentary tectonics. Regarding the petroleum-geological reservoir characteristics, described Middle Miocene cross-bedded biocalcarenites are compared with numerous large oil and gas pools in the world and in other localities in Croatia on the margins of inselberg massifs between the Drava and Sava rivers and south of Sava river.

Cross-bedded biocalcarenites; shoreline deposits; subaqueous dune; petroleum and gas reservar sandstone; synsedimentary tectonics; Badenian; Pannonian basin; eastern Croatia

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