In the case of well-to-well seismic, the observed wave field is complex. Generallly, the following waves are observed:

• Direct wave.
• Waves reflected and/or refracted on markers located above or below the depth of the receiver, with and without conversion phenomena.
• Conversion waves created by tube waves generated by the source. These conversion phenomena (tube waves-volume waves) occur at layer boundaries associated with strong acoustic impedance contrasts and at the bottom of the well.

Wave paths in well-to-well seismic