Coals are common locally.
Regionally, Jurassic facies are more terrigenous southeastward toward the Timan-Pechora shelf and coastline. Jurassic and Cretaceous volcanism affected northern provenance from the islands of Franz Josef Land. There are four stacked reservoir sandstones at the largest field, Shtokmanovskoye. Jurassic reservoir rocks are underexplored, with but little drilling to evaluate their potential. Known reservoir rocks are more discontinuous than their Jurassic counterparts and are commonly overpressured.