NMR Logging Principles and Aplications

Well logging, the economic method of choice for evaluating drilled formations, has progressively improved its determination of porosity and fractional fluid saturation, but could not provide a systematic estimate of permeability. This shortcoming was why Nuclear Magnetic Resonance captured the interest of the petroleum industry when researchers published results showing a good permeability correlation in the 1960’s.

No. of Pages: 253

Written by: Halliburton energy services

Unfortunately this industry interest was left waiting for nearly 30 years on a reliable downhole measurement of NMR relaxation. In 1992, when NUMAR introduced its MRIL logging service this wait was over; and it was soon demonstrated that the long hoped for permeability determination could be systematically provided, especially in shaly sand formations.

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