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Systems and methods for deep-looking NMR logging

  • US 7,463,027 B2
  • Filed: 04/30/2004
  • Issued: 12/09/2008
  • Est. Priority Date: 05/02/2003
  • Status: Active Grant
First Claim
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1. A system for nuclear magnetic resonance (NMR) logging of an underground formation traversed by a borehole, the system having a longitudinal axis and comprising:

  • two magnets polarized along the longitudinal axis, the magnets having like poles facing each other to generate in the underground formation a static magnetic field azimuthally symmetric with respect to the longitudinal axis, at least one of the facing magnetic poles being extended by one or more pole pieces with high permeability; and

    an antenna assembly interposed between the two facing magnetic poles, the antenna assembly comprising one or more directional antenna segments capable of operating at multiple frequencies, each antenna segment generating oscillating radio frequency (RF) fields orthogonal to the static magnetic field in one or more azimuthally focused sections of the underground formation surrounding the borehole.

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