Correlation of the inhomogeneous field as a measure of sample heterogeneity

► The correlation between echo-time dependent T2 and the internal magnetic field. ► We simulate the correlation between ∣g∣ and Bzi. ► Simulations show two types of “wings” which signify pore size heterogeneities. ► T2′-Bzi correlations for a monodisperse bead pack indicate slight pore size heterogeneity. ► T2′-Bzi correlations for Bentheimer sandstone show strong pore size heterogeneity.