The role of lingul shale as a cap rock for high-viscosity oil (bitumen) deposits
The article considers some specific features of "Lingul shale" pack spreading in the eastern part of Tatarstan Re public. "Lingul shale" thickness of the western slope of South-Tatar uplift is specified on the basis of logging data analysis. The "Lingul shale" pack is shown not always to be persistent and relible impermeable layer, especially while bitumen deposits development by heating methods of bitumen recovery.