The laboratory researches’ results of Mordovo-Karmalskoye oil-field’s bitumens’ optical properties, collectors’ heat conductivity’s data, statistical processing results of laboratory and factory are analyzed. The influence of conditions of thermal affects and heat conductivity of collectors on the optical properties of extracted bitumens are investigated. Correlation interrelations of bitumens’ optical properties with temperature conditions of their development, thermal and capacitance-fluid properties of collectors and typification of bitumens on optical properties are revealed. Recommendations on thermal affect’s perfection are given.