The effect of wait time on T 2 distributions from NMR experiments

Abstract

Nuclear magnetic resonance (NMR) relaxation curves for both T 1 and T 2 on two brine-saturated core plugs have been measured at 1 MHz. T 2 distributions were extracted from Carr–Purcell–Meiboom–Gill (CPMG) measurements using different wait times between consecutive echo sequences. The analysis was performed with both a limited number of exponentials and a continuous B-spline basis. The distributions depend strongly on wait time. The distributions were generally restored to the true distributions when a wait time correction was applied.