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NEW DATA ON THE TRIAS-JURASSIC DEPOSITS DRILLED BY GYDANSKAYA-130 PARAMETRIC WELL IN THE NORTH OF WEST SIBERIA

V. V. Sapyanik 1, V. S. Bochkarev 2, S. A. Rylkov 3, T. N. Toropova 1

1 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia; 2 Scientific and Analytical Center, Tyumen, Russia; 3 Uralnedra, Ekaterinburg, Russia

Gydanskaya-130 parametric well drilled in a section of a winter horizon, the lower part of which is built up mainly by a clayey unit of the Hettangian-Sinemurian age in contrast to adjacent sandy-silty sections of the “stratotypic terrain” of the winter formation. For the first time in the north of West Siberia marine sediments were determined at the basement of the Jurassic section due to the presence of index-species and typical complexes of two biostratons by foraminifers: F-layers with Turritellella volubilis and Pseudonodosaria dea (Hettangian-Sinemurian) and F-zone Trochammina zvetkovi (Hettangian). In addition, basin facies of the supposedly Carnian stage were determined in the ostracode complex first found in the Triassic section of West Siberia.

Keywords: stratigraphy, north of West Siberia, foraminifers, ostracodes, Lower Jurassic, Upper Triassic.

DOI 10.20403/2078-0575-2018-3-35-42