By the time of the Hercynian and Early Cimmerian orogenies, deepest Siluro-Ordovician source rock would have been generating wet gas.
Detachments occur in Artinskian and Kungurian shales and evaporites.
Those shales are thermally mature locally and provide both source rock and seal potential. Additional detachments in Upper Devonian to Lower Carboniferous shales and in Upper Ordovician evaporites create more complex structural deformation in the Kosyu-Rogov and Korotaikha foredeeps to the northeast. Numerous, large producing fields including the two largest oil fields in the province, Usa and Vozey produce from these anticlinal trends. The Pechora-Kolva Aulacogen is also prospective where it projects southeastward under the Uralian foredeep.