Petrography, petrochemistry, geochemistry, geochronology and biostratigraphy of rocks of the complexes of the Pre-Jurassic base of the Yugansk-Koltogorsky zone of the central part of Western Siberia were studied using the core of more than 40 wells. A geological map of the pre-Jurassic foundation of the 1:500000 scale zone has been constructed. At the base of the stratified strata of the region are metamorphic formations – quartz-sericite, albite-chlorite-quartz and other shales of the green shale facies, mainly its lower ones.