Correlation of Physicochemical Properties of Bach Ho Oils with Proton NMR Relaxation Parameters and Their Temperature Dependence

Abstract

The physicochemical properties of crude oils (density, viscosity, asphaltene concentrations) from the Bach Ho oilfield (Vietnam) have been correlated with ¹H 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 ηТ_1,2 = const/Т for viscous oils—has been refined. The temperature dependences of T_1,2i have been obtained, which manifest ordering processes in the test oils.