Device for seismic emission in an underground formation and method for implementing same

A device intended to emit waves in an underground formation, comprising at least one vibrator including two slabs, at least one motive element suited to generate vibrations and to communicate them to the slabs, and a generator for applying periodic control signals to the at least one motive element, where the vibrator is positioned in a well or cavity and embedded in at least one solid material providing coupling thereof with the underground formation, the at least one material being in contact with the two end plates over at least part of each of the respective faces thereof.

A method of generating in an underground formation vibrational signals according to an oriented emission pattern, comprising:

• installing in a same well vibrators each comprising two slab, at least one motive element for generating vibrations and to communicate the vibrations to the plates and a generator for applying periodic control signals to the motive element, each vibrator being positioned in a well or cavity and embedded in at least one solid material providing coupling thereof with the underground formation, the at least one solid material being in contact with the two slabs over at least part of each of the respective faces thereof;
• and
• sequentially controlling the various vibrators by means of a control with time lags between respective triggering times that depend on intervals between locations of the vibrators and a velocity of propagation of waves in the formations surrounding the well, so as to obtain a directive emission.