Conceptual geological model of the structure of the lower part of the Vendian deposits within the central part of the Baikit anteclise

UDK: 551.263
DOI: 10.24887/0028-2448-2023-5-68-73
Key words: Baykit anteclise, Oskoba formation, Vanavara formations, geological model
Authors: K.A. Tikhonova (RN-KrasnoyarskNIPIneft LLC, RF, Krasnoyarsk), S.K. Kvachko (RN-KrasnoyarskNIPIneft LLC, RF, Krasnoyarsk), D.V. Nazarov (RN-KrasnoyarskNIPIneft LLC, RF, Krasnoyarsk), N.B. Krasilnikova (RN-KrasnoyarskNIPIneft LLC, RF, Krasnoyarsk)

The conceptual geological model is the author's idea of the object under consideration from the standpoint of sedimentation conditions, the formation of reservoir properties and the spatial distribution of productive intervals, which is based on accumulated experience and the entire amount of factual data. The work performed is aimed at studying one of the largest assets of PJSC NK Rosneft, located in Eastern Siberia. The object of study in the presented work was the Vendian complex in the interval of the Vanavara and Oskoba formations, represented by terrigenous, carbonate and terrigenous-sulphate-carbonate deposits. For reliable mapping of productive formations in conditions of a complex heterogeneous geological structure, due to frequent changes in lithological composition and wedging out of formations, it is necessary to have a comprehensive understanding of the object. The methodological approach of RN-KrasnoyarskNIPIneft LLC described in the article includes the principles of detailed correlation and a set of analyzes aimed at studying the properties of reservoir rocks and their spatial distribution based on the data of laboratory studies of core material, standard and special methods of well logging and CDP-3D seismic surveys. As a result of the work, correlated lithostratigraphic units were identified, their qualitative and quantitative characteristics were given, the patterns of their distribution over the area were determined, and the mining potential was estimated. An integrated approach and consistent analysis made it possible to obtain a reliable three-dimensional geological model that can be used to predict the development of zones with improved porosity and porosity properties, plan exploration and production drilling, and assess the resource potential.


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