The results of the study of the geological structure and physical properties of oil and gas source rocks of the Kuonam formation within the northern side of the Vilyui hemisyneclise

UDK: 550.8

DOI: 10.24887/0028-2448-2026-5-30-35

Key words: Vilyui hemisineclise, Kuonam formation, seismic exploration, basin modeling, prediction of oil and gas potential

Authors: G.I. Fayzullin (Gubkin University, RF, Moscow; Russian Research Geological Petroleum Institute, RF, Moscow); V.G. Pashkov (Russian Research Geological Petroleum Institute, RF, Moscow); S.B. Myachev (Russian Research Geological Petroleum Institute, RF, Moscow); O.A. Vedenyapin (Russian Research Geological Petroleum Institute, RF, Moscow); S.F. Khafizov (Gubkin University, RF, Moscow); K.I. Dantsova (Gubkin University, RF, Moscow); A.S. Kurushina (Gubkin University, RF, Moscow)

Based on the seismogeological model of the structure of the northern side of the Vilyui hemisyneclise proposed by the authors, the spatial position and features of the occurrence of the Kuonam formation rocks are determined, and the modern boundaries of their distribution are clarified. The absence of rocks of the Kuonam formation in the junction zone of the Vilyui hemisyneclise and the Predverkhoyansky marginal trough was established. The lithological characteristics of the rocks are given, based on the results of drilling a parametric well. The results of 1D basin modeling enabled the assessment of the catagenetic transformation of the organic matter of the Kuonam formation rocks, the current depths of possible localization of oil and gas formation zones were determined. Based on the results of kinematic and dynamic interpretation of the seismic survey results, the physical properties of rocks and their area variation were studied. The zones of permafrost rocks, maximum compaction and minor decompression of rocks are identified. An assumption is made about the relationship between the nature of changes in rock properties and the presence and catagenetic transformation of organic matter. By combining structural, kinematic, and dynamic interpretation data with basin modeling results, the relationship between the nature of changes in rock properties and the catagenetic transformation of organic matter was confirmed. Studying the physical properties of the Kuonam formation's petroleum source rocks using the common depth point method, along with basin modeling, can form the basis for a separate petroleum potential forecast within the Vilyui hemisyneclise.

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