A pulse nuclear magnetic resonance study of the structure of resinous-asphaltenic components of crude oils

Abstract

Pulsed magnetic resonance was used to determine the parameters of proton magnetic relaxation in crude oil specimens of a wide density range (p = 770-900 kg/m3). The measurements were made on a NMR relaxometer designed for the purpose. The dependence of proton relaxation parameters on viscosity of crudes and concentration of asphaltenes and resins was determined. Based on the obtained experimental data, a molecular dynamics model for the structure of the resinous-asphaltenic portion of petroleum was proposed. Calculated NMR parameters were fitted to their experimental counterparts.