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 with a static magnetic field having a gradient. Data is acquired from at least three sensitive volumes of the medium using an interleaved sequence of pulses (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 at least one refocusing pulse are used.