Description: This chart is used to predict the T1 of crude oils with various viscosities and densities or specific gravities to assist in interpretation of the fluid content of the formation of interest. Known values of T2 and TE can be used to approximate the viscosity by using this chart. These charts are used to predict the diffusion coefficient of hydro-
carbon as a function of formation temperature and viscosity and of water as a function of formation temperature. This chart is divided into three distinct sections based on the composition of the oil measured. The type of oil contained in the formation can be determined from the measured T1 and viscosity determined from the transverse relaxation time chart. The viscosity can be determined with values of the measured T2 and TE for input to the longitudinal relaxation time chart to identify the type of oil in the formation.
Source: © Log Interpretation Chartbook (2009), Schlumberger