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Subsurface electromagnetic measurements using cross-magnetic dipoles

  • US 7,239,145 B2
  • Filed: 03/29/2004
  • Issued: 07/03/2007
  • Est. Priority Date: 03/29/2004
  • Status: Expired due to Fees
First Claim
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1. A resistivity imaging tool for determining subsurface properties, comprising:

  • an elongated body having a longitudinal axis and adapted for disposal within a subsurface borehole;

    a transmitter disposed on the body and adapted to transmit electromagnetic energy; and

    a receiver disposed on the body at a distance two inches (5 cm) or less from the transmitter and adapted to receive electromagnetic energy;

    wherein the transmitter or receiver comprises at least one antenna with its axis tilted with respect to the longitudinal body axis, wherein each transmitter and receiver comprises two antennas with their axes substantially orthogonal to one another, the transmitter antennas and the receiver antennas being arranged in the same orthogonal directions; and

    wherein the transmitter and receiver are both disposed in an insulating material within a cavity on the elongated body.

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