The West Siberian Basin is one of the richest world-class petroliferous basins.With continuous development of the conventional oil

the oil production is declining continuously

so it is an urgent need to find new growth points of the oil production.The characteristics of its shale oil reservoirs are studied through analyses of the geochemical characteristics and reservoir physical properties of the main source rocks of the Bazhenov Formation in the basin

and the technical recoverable tight oil resources are estimated by using the graphics-volume method.Also the recoverability of the Bazhenov tight oil is evaluated comprehensively through comparison with some famous tight oil plays

such as Bakken

Eagle Ford and Yanchang tight oil plays.The result shows that the Bazhenov Formation is an excellent source rock featuring in high organic matter abundance

moderate maturity

large thickness of 20-50 meters. The lithologies are dominated by carbonate silicates and shaly silicates with interbeds of carbonates and siltstone.The quartz content is high

the clay content is low

and natural fractures are highly developed in local areas.The reservoir belongs to type Ⅰ and type Ⅱ tight reservoir with high oil saturation.The technical recoverable resource of the Bazhenov tight oil is 7.6 billion tons

and class Ⅰ resource of tight oil is 0.92 billion tons

which are mainly distributed in the central and west region of the basin.Taking the available facilities into consideration

the Central Ob

with all the key geological conditions at the standards of world-class tight oil plays

is the most favorable area for future development.