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 servicesUnfortunately 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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