Аннотация:The Bazhenov Formation rocks have been found to contain thin luminescent layers enrichedin type I kerogen, which is untypical of the majority of organic matter (OM) from the Bazhenov Formation in the central part of the West Siberian petroleum basin.The detailed characteristics of the mineral and organic parts ot these lyers are called @algenite-rich layers" by the authors, are providedand variants of their originare proposed.The wide distribution of the luminescent alginite-rich layers over the area in a single stratigraphic interval allowes their use as marker horisons, as well as for assessing the thermal maturity of kerogen.These redsults contribute to understanding the diversity of the proce3ss that form the organic-rich rocks in the Bazhenov Formation.