RAPID NMR MULTI-FREQUENCY T1 AND T2 ACQUISITION FOR EARTH FORMATIONS EVALUATION WITH MWD OR WIRELINE TOOLS

摘要

Nuclear magnetic resonance measurement of a medium are made using a tool wit h a static magnetic field having a gradient. Data is acquired from at least three sensitive volumes of the medium using an interleaved sequence of pulse s (103, 105, 107) at three different frequencies (f1, f2, f3). At each frequency, a number of sub-sequences of a saturation, a recovery pulse and a t least one refocusing pulse are used.