Patent ID: 7602669

Claim:
A method for seismic imaging using tube-waves, the method comprising the steps of: a) transmitting an input tube-wave waveform down a transmitter borehole through a permeable fluid saturated layer of geological mass within a geological field; b) enhancing with a perforation in the transmitter borehole a coupling of the input tube-wave waveform in the transmitter borehole at the permeable fluid saturated layer of geological mass within the geological field outside the transmitter borehole as a converted signal tube-wave waveform that propagates within the permeable fluid saturated layer of geological mass as a channel guided wave; c) receiving the converted propagating signal tube-wave waveform that propagated through the permeable fluid saturated layer of geological mass as a channel guided wave at a receiver borehole, and coupling the received converted propagating signal tube-wave waveform into the receiver borehole as a received tube-wave waveform; and, d) digitally processing the received tube-wave waveform to produce a seismic image of said permeable fluid saturated layer of geological mass disposed between said transmitter and receiver boreholes, wherein said receiving step and said coupling step for said received tube-wave waveform occurs after the arrival of an initial P wave through said geological field in traditional seismic imaging.