The sedimentary rocks of research territory contain a large number of trappean intrusions. These intrusions complicate structural plans of the reflecting seismic horizons and influence distribution of hydrocarbon accumulations. For correct creation of structural maps according to seismic data it is necessary to consider lateral variations of interval velocity. These variations are caused by non-uniform distribution of traprocks in the sediments. Revealed with the help seismic logging in the deep wells velocity variations on each seismic sequence allowed to increase reliability of seismic structural constructions. Based on complex interpretation of seismic data, well logging and results of deep drilling regularities of changing traprock thickness within each seismic sequence were revealed, maps of thickness and percentage of intrusive bodies were made. The analysis of these maps showed that intrusive sheets caused essential impact on structural plans above the Usolsky horizon. These intrusions give occasion to rearrangement, or to destruction of tectonic structures. Complication of the structural plan is fixed only for top levels, above the Lower Cambrian where the saturation of traprocks is very high and reaches 50 % and above. The thickness of traprocks is necessary to take into account at recovery of structural history


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