Have you ever questioned the quality of the NMR log data in your well? There are all those LQC checks you may make to ensure the CPMG echo train is of good quality, i.e. noise, noise flag, gain, chi, delta_B0, SNR….
Why not look at the echo train instead. All of the above checks are analogous to checking your blood pressure, or having an ECG, but the final validation is an Angiogram to look at the artery health.
Below are a few examples of good, bad and ugly echo trains. I will let you be the judge of the T2 distribution created from the inversion of these CPMG trains.
Track 1: Reconstructed echo amplitude decay
Track 2: T2 Distribution resulting from CPMG echo train inversion
Track 3: CPMG echo train, phase corrected signal channel, inversion input
Track 4: CPMG echo train, noise channel
Go ahead and look at your echoes, it is not that hard, but you will not find it in the friendly LAS file. Ask your service company to provide the DLIS containing the raw unstacked PAPS.
Contact me if you would like to have a chat about your data.
Founder, Director and Principal of Virtual Petrophysics