Abstract: The maturity of Jurassic organic matter in giant petroliferous basin of West Siberian province depends on the depth and the maximum temperature. The temperature distribution in sedimentary cap rock and local fault block-folded time in Paleozoic basement as well as deep fault formation are related to the magmatic rock composition and intrusion time. These factors controlling temperature field and cap rock's organic matter maturity are found globally. The fault blocks are classified into three types that accord with geotectonic style in terms of the basement- consolidated time. The first type of fault blocks accords with blocks in Baikalides; the second one with those in Hercynian and Himalayan fold belts; the third one belongs to Triassic rift in the basement, which accords with large scale granitic mass and fluid-transporting faults.

Key words: West Siberia, giant basin, organic matter, destruction, destructive factor