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

Pulsed magnetic resonance was used to determine the parameters of proton ma gnetic relaxation in crude oil specimens of a wide density range (rho = 770 -900 kg/m(3)). The measurements were made on a NMR relaxometer designed for the purpose. The dependence of proton relaxation parameters on viscosity o f crudes and concentration of asphaltenes and resins was determined. Based on the obtained experimental data, a molecular dynamics model for the struc ture of the resinous-asphaltenic portion of petroleum was proposed. Calcula ted NMR parameters were fitted to their experimental counterparts.