Abstract
Neogene deposits of the Polyanytska Suite were exposed by the South Boryslav-1 well within the eastern block of the South Boryslav structure of the Boryslav oil and gas condensate field of the Outer Carpathians. The studied sediments of the Polyanytska Suite belong to the complex zone of planktonic foraminifers Globigerina pseudoedita with a characteristic association: Globigerina pseudoedita, Globoquadrina dehiscens, Dentoglobigerina langhiana, Trilobatus trilobus, Tenuitella brevispira, Tenuitella denseconnexa, Globorotalia tetracamerata, Globigerinella evoluta, Globigerinella obesa, Chiloguembelina gracillima. The Globigerina pseudoedita zone of planktonic foraminifera correlates with the zonal interval of nannoplankton NN2-NN3 of the Central Paratethys, which covers the upper part Eggerian, Eggenburgian, and the lowest part Ottnangian of the Central Paratethys and is compared with the upper Aquitan – the lower part of the Burdigal of the lower Miocene of the Neogene of the International Chronostratigraphic Scale. The sediments of the Polyanytska Suite were formed in a normally saline sea basin, with depths from the middle to the inner shelf. The medium shelf conditions (intervals 1812–1805 m; 1684–1645 m and 1546–1485 m in the the South Boryslav-1 well) are indicated by a relatively high percentage content and morphology of the shells of planktonic foraminifera, the taxonomic composition of calcareous benthic foraminifera. The presence of plankton indicates normal water salinity. Analysis of foraminifera in the interval 1395–1365 m indicates the depths of the inner shelf. The identified redeposited foraminifera of the Paleocene-Lower Oligocene testify to the erosion and demolition of clastic material from the uplifted part of the Carpathians.
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