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The development of oil deposits in the Republic of Tatarstan is entering a late stage. Deposits of natural bitumen of Cheremshano-Yamashinskaya structural zone, in particular, Ashalchinskoye, Mordovo-Karmalskoye and others, were studied. For their development requires the use of active methods ? method of thermal (steam-thermal) impact. The use of method is limited by the stability conditions of its fluid seals. Fluid seals are the layers of ?lingul clay? ? deposits of the Kazanian stage. They are represented by c...