The physicochemical properties of crude oils (density, viscosity, asphaltene concentrations) from the Bach Ho oilfield (Vietnam) have been correlated with H-1 NMR relaxation parameters (spin-lattice and spin-spin relaxation times T-1i and T-2i, respectively), and their temperature dependence has been studied. The results are discussed in terms of the concept of the formation of structural units (SU) in oils. The standard "alkane line"-the conventional correlation eta T-1,T-2 = const/T for viscous oils-has been refined. The temperature dependences of T-1,T-2i have been obtained, which manifest ordering processes in the test oils.