UDC 550.42(550.832)/551.8 |
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DISTRIBUTION OF RADIOACTIVITY IN THE BAZHENOV FORMATION AND ITS STRATIGRAPHIC ANALOGUES IN THE CENTRAL PART OF WESTERN SIBERIA
E. V. Ponomareva 1, V. V. Lapkovsky 1,2
1 A.A.Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia; 2 Novosibirsk State Technical University, Novosibirsk, Russia
Based on the data of gamma-ray logging of wells in the central part of the West Siberian petroleum basin the map and three-dimensional model of the natural radioactivity distribution values of rocks within the Bazhenov Formation and its stratigraphic analogues were constructed, that is mainly due to the uneven distribution of uranium in rocks. Most often, the average values of gamma activity in the Formation interval are in the range of 30–50 μR/hr. Areas with increased levels of radioactivity and uranium concentrations are usually confined to the middle part of the Formation. Regionally, sediments with increased gamma activity values tend to zones of Early Mesozoic graben rifts and uplifted parts of positive tectonic elements of the first order. In general, areas with elevated uranium concentrations have, to a large extent, a patchy rather than layered distribution over the section.
Keywords: Bazhenov Formation, uranium, natural gamma activity, West Siberia, 3D modeling.
DOI 10.20403/2078-0575-2024-2-50-59