Patent ID: 6538447
Filing Date: 2003-03-25
Classification: G01V

Abstract:
A logging tool to make resistivity measurements of a drilled formation, the tool having an upstream direction and a downstream direction along its length, the logging tool comprising:an array of receivers, said array including least three receiver antennas; a first pair of receivers selected from the array, said first pair of receivers defining a first midpoint therebetween; a second pair of receivers selected from the array, said second pair of receivers defining a second midpoint therebetween; said first pair of receivers positioned upstream of said second pair of receivers; a plurality of transmitters, said transmitters configured to transmit electromagnetic waves into the formation; said first and said second receiver pairs configured to receive said electromagnetic waves; a first transmitter and a second transmitter, said first transmitter located upstream of said receiver array, and said second transmitter positioned downstream of said receiver array; said first transmitter and said second transmitter located substantially equidistant from said first midpoint; a third transmitter located downstream of said second transmitter along the length of the tool; and said third transmitter and said first transmitter located substantially equidistant from said second midpoint.