Patent ID: 9671483
Date: 2017-06-06
CPC Classifications: G01N,G01R,G01V

Claim:
1. A method for processing nuclear magnetic resonance (NMR) measurement data, the method comprising: conveying a downhole NMR tool through a borehole penetrating the earth and operating the downhole NMR tool in the borehole, the downhole NMR tool comprising a processor; receiving, with the processor, NMR measurement data obtained from the downhole NMR tool, the NMR measurement data being affected by a motion artifact and comprising a first echo train obtained with a long polarization time TW providing, with the processor, an indication of incompatibility between the first echo train and the second echo train; at least one of (i) reducing, with the processor, an effect on the NMR measurement data of the motion artifact using the first echo train and the second echo train using the indication of incompatibility and (ii) identifying, with the processor, the motion artifact using the first echo train and the second echo train using the indication of incompatibility; and applying motion correction, with the processor, on the NMR measurement data using the indication of compatibility; wherein the motion artifact is related to a magnetic field magnitude that varies in a volume of interest due to a motion of the NMR tool.