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STRUCTURAL MODELS OF OIL-AND-GAS-BEARING LOWER JURASSIC STRATA AND THEIR FORMING CONDITIONS IN THE SIBERIAN ARCTIC​

P. А. Glazyrin 1,2, G. G. Shemin 1

1 Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia; 2 Novosibirsk State University, Novosibirsk, Russia​

Lower Jurassic strata in the Siberian Arctic are regarded as a primary potential exploration target with yet to find hydrocarbon resources. However, given the paucity of drilling data, reconstructions of their structural framework and forming conditions in the northern parts of the study area for a long time were limited to sequence-stratigraphic modelling. A comprehensive study of the Hettangian-Sinemurian, Pliensbachian and Toarcian regional reservoirs and their components (Lower Jurassic reservoir rocks and seals) was for the first time carried out for the entire study area. The applied unified methodology for building the reconstructions which are easy to adjust with new information ensured comparability of research results for different structuralfacies zones, thus allowing us to significantly expand the region of interest. The recent offshore Kara Sea drilling data first ever used in the reservoir modeling of the high north areas allowed improving both the accuracy of reservoir property prediction, and the history of reservoir evolution. The resulting models reflecting the permeability heterogeneity of reservoir rocks and seals allowed us to identify their higher quality areas, which can be used to facilitate future exploration in poorly studied Arctic regions.

Keywords: reservoir, reservoir rocks, seal, structural framework, mineral composition, forming conditions, container-rocks, porosity, permeability.

DOI 10.20403/2078-0575-2026-1-27-47

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