Apparatus for generating seismic waves

Details Apparatus for generating seismic waves Apparatus for generating seismic waves

1987-12-21

1989-05-30

Steinberger, Brian S.

Acoustics

Geophysical or subsurface exploration

Well logging

181402, 367912, G01V 140

Patent

active

048342106

ABSTRACT:
An improved apparatus for generating a seismic wave in a borehole in the earth is disclosed. A portion of the borehole, which may be the bottom of the hole or any other point along its length, is selected as the site for seismic wave generation. A device is provided to oscillate the borehole fluid in a selected portion of the borehole to establish a resonant standing pressure wave of desired frequency within the fluid. The wave is maintained by continuing to supply energy to the fluid to replace losses due to fluid friction, structural losses and radiated acoustic energy. The standing wave thus created is radiated through the borehole wall into the earth and is eventually received by seismic detectors located on the surface.

REFERENCES:
patent: 4632212 (1986-12-01), Benzing
patent: 4671379 (1987-06-01), Kennedy et al.
patent: 4716555 (1987-12-01), Bodine
patent: 4722417 (1988-02-01), Selsam
patent: 4734892 (1988-03-01), Kotlyar

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