Single-Well Reflected Horizontal Shear Wave Imaging With Mixed Types Of Transmitters And Receivers

A method for measuring a horizontal-polarized shear wave comprising:

• disposing a downhole tool into a borehole, wherein the downhole tool comprises:
• a transmitter configured to transmit a sonic waveform into a formation, wherein the transmitter is a dipole;
• and
• a receiver configured to record a response from a borehole, wherein the receiver is a quadrupole;
• selecting a frequency range for the transmitter to a horizontally-polarized shear formation body wave;
• broadcasting the sonic waveform as the horizontally-polarized shear formation body wave into the formation penetrated by the borehole with the transmitter;
• recording a reflected wave on the receiver as waveform data, wherein the reflected wave is the horizontally-polarized shear formation body wave reflected from a reflector;
• and
• processing the waveform data with an information handling system.

A method for processing a dipole-quadrupole signal comprising

• inputting a sixteen component data set into an information handling system;
• decomposing the sixteen component data set to a four component data set with the information handling system;
• removing borehole guide waves from the four component data set with the information handling system;
• separating reflected waves as up going signals and down going signals;
• selecting a target azimuth of θ;
• rotating a dipole transmitter to face θ;
• rotating a quadrupole receiver to face θ;
• selecting a second azimuth to record horizontally-polarized shear waves;
• imaging a reflector from a formation;
• and
• displaying an image of the reflector.