Patent ID: 6163155
Filing Date: 2000-12-19
Classification: G01V

Abstract:
A tool for determining the horizontal and vertical resistivities and relative dip angle of an earth formation, said tool having a tool axis and comprising:at least one transmitter antenna disposed within a plane oriented at a first angle with respect to the tool axis for transmitting electromagnetic energy into said formation;a first receiver antenna spaced at a first distance away from said at least one transmitter antenna along the tool axis and disposed within a plane oriented at a second angle with respect to said tool axis, said second angle being different from said first angle, for receiving electromagnetic energy from said formation caused by said at least one transmitter antenna and generating a first response signal representative of the resistivity of said formation;a second receiver antenna spaced at a second distance away from said at lest one transmitter antenna along said tool axis and disposed within a plane oriented at a third angle with respect to said tool axis, said second distance being different from said first distance and said third angle being different from said first angle, for receiving electromagnetic energy from said formation caused by said at least one transmitter antenna and generating a second response signal representative of the resistivity of said formation; anda processor for calculating the horizontal resistivity, vertical resistivity, and relative dip angle based on said first and second response signals.