Patent ID: 6791330
Filing Date: 2004-09-14
Classification: G01V

Abstract:
An apparatus for determining resistivity of a formation surrounding a borehole, the apparatus comprising:a housing having a longitudinal axis; first and second transmitting antennas affixed to the housing for transmitting electromagnetic waves into the formation; a first untuned receiving antenna for detecting the electromagnetic waves, the first untuned receiving antenna being affixed to the housing at a position along the longitudinal axis of the housing above the first and second transmitting antennas; a second untuned receiving antenna for detecting the electromagnetic waves, the second untuned receiving antenna being affixed to the housing at a position along the longitudinal axis of the housing below the first and second transmitting antennas; and a processor operatively coupled to the first and second untuned receiving antennas for determining the resistivity of the formation based on the electromagnetic waves detected by the first and second untuned receiving antennas.