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Two-dimensional magnetic resonance imaging in a borehole

  • US 6,522,137 B1
  • Filed: 06/28/2000
  • Issued: 02/18/2003
  • Est. Priority Date: 06/28/2000
  • Status: Expired due to Term
First Claim
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1. A method usable with a downhole NMR measurement apparatus, comprisingusing a magnet to polarize spins in a downhole formation that surrounds the NMR measurement apparatus;

  • transmitting RF pulses pursuant to an NMR pulse sequence into the downhole formation;

    in response to the RP pulses, receiving spin echo signals from a region of the formation;

    generating a pulse gradient field in the downhole formation;

    controlling the generation of the pulsed gradient field to phase encode the spin echo signals; and

    imaging at least one formation evaluation characteristic, independent of fluid flow within the formation, based on the phase encoded spin echo signals for at least a two-dimensional region of the downhole formation that circumscribes the NMR measurement apparatus.

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