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How are nmr logging tools different from laboratory logging tools?


Asked by Camden Hunt on Dec 07, 2021 FAQ



Compared to laboratory or clinical nuclear magnetic resonance (NMR), the dimensions of a typical borehole and the nature of continuous logging impose severe constraints on the physics, equipment, and operation of NMR logging tools.
Furthermore,
The NML tool—the first generation of NMR logging (1960–1994)—was an Earth’s field device that measured the free-induction decay in the Earth’s magnetic field. Proton polarization (alignment) was achieved using a magnetic field produced by a coil energized with a strong direct current.
In addition, There are numerous applications of nuclear magnetic resonance (NMR) logging in formation evaluation for the estimation of hydrocarbon reserves and their producibility. As the logging tools improve their capability, more and more new applications of NMR logs are being discovered.
Besides,
MR Scanner service’s NMR measurements are made independently of other logging outputs and are unbiased by formation water salinity or the rock matrix. This avoids the ambiguity introduced by shale, thin beds, or low resistivity contrast to conventional measurements.
Likewise,
A centralized NMR logging tool like the MRIL must be longer than a pad device, simply to contain magnets of sufficient strength to project the required magnetic field, through the borehole and into the formation. This factor results in a greater sensitivity to borehole salinity than a pad device, which can exclude the mud from its measurement.