Pp. 337-345 V.L. Shuster, S.A. Punanova JUSTIFICATION OF OIL AND GAS POTENTIAL OF THE JURASSIC-PALEOZOIC DEPOSITS AND THE BASEMENT FORMATIONS OF WESTERN SIBERIA V.L. Shuster, S.A. Punanova Oil and Gas Research Institute of the Russian Academy of Sciences, Moscow, Russia Abstract. <...> In terms of perceived decline trend of oil production and reserves increment from the ‘conventional’ Cretaceous and Upper Jurassic deposits of the main region of Russian hydrocarbon production – Western Siberia, the paper considers oil and gas potential of the Jurassic-Paleozoic sediments and, mainly, the basement formations. <...> It is the basement, along with deposits of the Bazhenov Formation, which is associated with a possible significant increase in resources of oil (gas) in Western Siberia. <...> In assessing the prospects for the oil and gas potential of the basement, the focus in the research was paid to the study of the structure, including reservoir properties of reservoir rocks and geochemical conditions of oil (gas) deposits formation. <...> Keywords: Western Siberia, basement, pre-Jurassic deposits, deposits of oil and gas, oil and gas potential, reservoir rocks, geochemical conditions, microelements, oil generating potential DOI: 10.18599/grs.18.4.13 For citation: Shuster V.L., Punanova S.A. Justification of Oil and Gas Potential of the Jurassic-Paleozoic Deposits and the Basement Formations of Western Siberia. <...> In Western Siberia, the main oil reserves are Subcomplexes Transition subcomplex Folded basement Age Trias, Upper Permian Palaeozoic Consolidated basement Archean-Proterozoic, in the middle of the basin – suboceanic (Triassic) Lithology volcanic-clastic rocks (turin series), limestone and dolomite metamorphic, magmatic dislocated rocks magmatic (with predominance of granitoid) Table 1. <...> Schematic section of the pre-Jurassic complex of West Siberia. 337 concentrated in the Cretaceous and Upper Jurassic deposits. <...> The promising new objects (areas of exploration works) include basal layers of the Lower and Middle Jurassic and thinning areas of Jurassic horizons (in the north of the territory), sedimentary and volcanosedimentary rocks of Triassic filling graben-like depressions (here a large Rogozhnikovsky oil field has been discovered), formation of the weathering crust and areas of decompressed basement rocks. <...> Petroleum potential of the pre-Jurassic complex of Western Siberia has been enlightened in a significant number of publications, including (Schuster, 2003; 2008; Schuster, Punanova, 2011; 2013; 2014 <...>