The article presents the results of correlation of the Jurassic and Cretaceous sediments of the Purpei-Vasyugan and Tazo-Khetsky region, which made it possible to detail the internal structure of the Yanovstan formation and determine the position of productive strata in its composition. The Yanovstan formation is interpreted as a geological body consisting of two sub-formations. The lower substructure of the parallel layered structure consists of basal, Tolkinskaya, Bazhenov units. The upper sub-formation, bounded by the Soryakhinskaya unit (the top of the Bazhenov horizon), has a clinoform structure. Its deposits consistently downlap to the top of the Bazhenov unit. The constructed model is in good agreement with the results of previous studies. The areas of the Yanovstan sub-formations, as well as the areas of its productive reservoirs became the basis for zoning the territory. It is proposed to divide the Tazo-Khetsky region into two sub-districts: Eastern and Western. The eastern sub-district is divided into two zones – Mangazey and Thermokarst, the western sub-district into – Novochaselskaya and Tolkinskaya. Productive reservoirs YN3, YN2 of the lower sub-formation are present in the Tolkinskaya and Thermokarst zones. In the Eastern subdistrict, the YN1 reservoir is present as part of the upper sub-formation.
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