Regional conceptual geological model of the J11 horizon of the Vasyugan formation and its significance in the study of individual areas and planning of geological exploration work

UDK: 550.8.072

DOI: 10.24887/0028-2448-2025-5-26-31

Key words: Vasyugan formation, conceptual geological model, deltaic deposits

Authors: N.A. Polyukh (Gubkin University, RF, Moscow); A.S. Buzilov (PetroТrace LLC, RF, Moscow); P.S. Litvinenko (Gazpromneft-Khantos LLC, RF, Khanty-Mansiysk); S.F. Khafizov(Gubkin University, RF, Moscow)

The Vasyugan formation in the southern part of the West Siberian oil and gas province is one of the primary oil and gas complexes. In the study area, confined to the tectonic zone of the junction of the Yugansk megadepression with the Nizhnevartovsk arch, the J11 horizon is of greatest interest for geological exploration and replenishment of the resource base. Due to the polyfacial structure of the studied reservoir and the presence of various hydrodynamic barriers that affect the nature of the formation saturation and separate the structural elements of the III-IV orders, to which the oil deposits are confined, a regional conceptual geological model was developed. The features and evolution of sedimentation of the late Oxfordian paleodelta system are specified by means of integration of seismic and well data. Tracing the migrational transgressive-regressive events enabled to identify the facies features of the structure and to classify and rank the sand objects of the J11 horizon. Sand facies of delta mouth bars, distribution channels and accretionary complexes, and transgressive barrier island systems were established and mapped. The significance of the regionally formed structural patterns of the J11 horizon is shown in the development of a program for exploration drilling. The proposed approach to conceptual modeling can be applied to similar geological objects.

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