Lower Triassic sequences Shapkin-Yuryakha Shaft of the Timan-Pechora Petroleum Province were studied by the complex lithological, petrophysical and geochemical methods. It is established that productive deposits are represented by sandstones that formed in arid climates amid a vast alluvial-lacustrine plain. The research allowed to study and characterize the structure features of rock and mineral aggregates, forming pore free space textures. The high heterogeneity of the composition and structure of the cement minerals of the reservoir caused by local faciespaleogeographic sedimentation conditions, were the cause of the significant variability of the void space. Rocks reservoirs are complex, with high content of clay component; an effective field development requires special methods of stimulation.