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Method and apparatus for resistivity imaging in boreholes with an antenna and two spaced apart electrodes

  • US 8,203,344 B2
  • Filed: 09/14/2006
  • Issued: 06/19/2012
  • Est. Priority Date: 09/14/2006
  • Status: Active Grant
First Claim
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1. An apparatus configured to evaluate an earth formation, the apparatus comprising:

  • at least one antenna on a downhole assembly, the at least one antenna including an antenna with a coil having an axis substantially parallel to an axis of the downhole assembly configured to be conveyed in a borehole in the earth formation and induce an electrical current in the earth formation upon activation of the at least one antenna; and

    at least two azimuthally spaced apart electrodes in proximity to the formation, a difference in electrical potential between the at least two electrodes responsive to the induced electrical current being indicative of a property of the earth formation.

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