The paper presents the results of interpretation of 488 samples examined by the pyrolytic Rock-Eval method, of which 69 are from the Bazhenov formation, 12 from the Togur formation and 407 from the Tyumen formation. The research region is the south of the West Siberian oil and gas province (12 areas). Other Rock-Eval pyrolysis data were also used to characterize the potential of oil-producing rocks to the fullest extent. Correct interpretation can be performed for samples not contaminated with migratory hydrocarbons. The description of samples of a part of the studied areas is presented. A detailed study of the area is due to the significant prospect of its oil and gas potential. The content of organic carbon, the stages of thermal maturity, the type of kerogen and the generation potential for the parent rocks of the Togur, Tyumen and Bazhenov formations were determined. The main purpose of this study is to determine the quality of kerogen and the amount of organic matter. The organic matter dispersed in the rock for the samples of the Tyumen formation corresponds in composition to kerogen of type II, III. In the Van Crevelin diagram, most of the points of the Togur formation are grouped between the evolution curves of kerogens of the second and third types; this indicates a possible mixing of the two types of kerogen. The generation potential of the rocks of the Tyumen formation varies from "poor" to "excellent". The generation potential of the samples of the Togur formation (for all studied areas) varies from average to very good. The generation potential of the Bazhenov formation varies from very good to excellent. The variety of conditions for the accumulation of organic matter increases to the east of the research area. The content of organic matter and its quality make us believe that conditions favorable for the formation of deposits persist throughout the section, gradually deteriorating towards the east.
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