V.А. Kazanenkov, P.А. Yan, L.G. Vakulenko, А.Yu. Popov
 
Paleogeographic control of oil-bearing capacity in the Malyshevsky Horizon of the Tailakovsky group of fields, Western Siberia
DOI 10.31087/0016-7894-2019-3-115-126

Based on the results of integrated sedimentological analysis of core taken from 10 wells and logging data from more than 100 wells, backstripping for Malyshevsky stratigraphic horizon (Middle Jurassic, Bathonian) in the group of Tailakovsky fields is carried out in the junction zone of north-eastern slope of Verkhnedemyansky mega-swell and southern shoulder of Yugansky mega-depression. The authors discuss features of structure, composition, and conditions of oil and gas bearing Ю2 and Ю3 horizons formation, and lithological and geophysical criteria for their identification in the section. It is found in the study area that Malyshevsky Horizon is mainly composed of alluvial-lacustrine-palustrine deposits. In the upper part, the transitional deposits of coastal-marine and shallow-marine genesis are observed. The authors discuss the features of paleotopography evolution in the Bathonian time. They also demonstrate the association of oil-saturated intervals with channel sand bodies of the meandering alluvial paleosystems (Ю2 2 –Ю3 beds), with elongated sinuous shape and mostly northern strike typical of them. Reservoirs of deltaic and coastal-marine series identified at the Malyshevsky Top (Ю2 1 bed) are less common; they are represented by subaqueous levees, alongshore bars, and deltaic sand bodies. It is found that the spatial distribution patterns of granulated productive reservoirs, their morphology, structural and compositional features were primarily determined by a set of paleogeographic factors, namely: paleotopography, situation of local and regional sourcelands, parameters of sedimentary systems, and relative sea level variations.

 

Key words: Western Siberia; Verkhnedem’yansky mega-swell; Tyumen Formation; Ю2–Ю4 beds; paleogeography; oil-bearing capacity.

For citation: Kazanenkov V.А., Yan P.А., Vakulenko L.G., Popov А.Yu. Paleogeographic control of oil-bearing capacity in the Malyshevsky Horizon of the Tailakovsky group of fields, Western Siberia. Geologiya nefti i gaza = Oil and gas geology. 2019;(3):115–126. DOI: 10.31087/0016-7894-2019-3-115-126.

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V.А. Kazanenkov

Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences (IPGG SB RAS), Novosibirsk, Russia;

tatianaharahinova@yandex.ru

P.А. Yan

Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences (IPGG SB RAS), Novosibirsk, Russia;

Novosibirsk State University, Novosibirsk, Russia;

tatianaharahinova@yandex.ru

L.G. Vakulenko

Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences (IPGG SB RAS), Novosibirsk, Russia;

Novosibirsk State University, Novosibirsk, Russia;

tatianaharahinova@yandex.ru

А.Yu. Popov

Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences (IPGG SB RAS), Novosibirsk, Russia;

Novosibirsk State University, Novosibirsk, Russia;

tatianaharahinova@yandex.ru