Methods to perform nuclear magnetic resonance measurements, and nuclear magnetic resonance tools

A NMR tool for use in a wellbore in a subterranean region, the NMR tool comprising:

• a magnet assembly configured to produce a magnetic field in a volume in the subterranean region;
• an antenna assembly configured to produce an excitation in the volume, and to receive NMR signals from the volume;
• and
• an acquisition system coupled to the antenna assembly and configured to:
• acquire a first NMR signal using a first acquisition window having a first duration;
• and
• acquire a second NMR signal using a second acquisition window having a second duration, wherein the second duration is different than the first duration;
• and
• a processor coupled to the acquisition system and configured to:
• acquire using an NMR sensor a first NMR signal from a volume in the subterranean region, wherein the first NMR signal is acquired using a first acquisition window;
• acquire using the NMR sensor a second NMR signal from a volume in the subterranean region, wherein the second NMR signal is acquired using a second acquisition window different from the first acquisition window, wherein the first NMR signal and the second NMR signal form an NMR relaxation data;
• determining, using the first NMR signal and the second NMR signal, a correction term;
• and
• using the correction term to acquire a corrected relaxation data set.

A non-transitory storage medium comprising instructions, which when executed by a processor, cause the processor to perform operations comprising:

• acquiring using an NMR sensor a first NMR signal from a volume in a subterranean region, wherein the first NMR signal is acquired using a first acquisition window;
• acquiring using the NMR sensor a second NMR signal from a volume in the subterranean region, wherein the second NMR signal is acquired using a second acquisition window different from the first acquisition window, wherein the first NMR signal and the second NMR signal form an NMR relaxation data;
• determining, using the first NMR signal and the second NMR signal, a correction term;
• and
• using the correction term to acquire a corrected relaxation data set.