Method and apparatus for generating seismic waves

Details Method and apparatus for generating seismic waves Method and apparatus for generating seismic waves

1985-09-03

1987-06-09

Jordan, Charles T.

Acoustics

Geophysical or subsurface exploration

Well logging

181113, 181401, 367 25, 166177, G01V 140

Patent

active

046713794

ABSTRACT:
A method and 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: 2281751 (1942-05-01), Cloud
patent: 2433746 (1947-12-01), Doll
patent: 2451797 (1948-10-01), Blanchard
patent: 3221833 (1965-12-01), Malmburg
patent: 3349867 (1967-10-01), Mounce
patent: 3718205 (1973-02-01), Fair et al.
patent: 3730269 (1973-05-01), Galle
patent: 3909776 (1975-09-01), Broding et al.
patent: 3997021 (1976-12-01), Chelminski
patent: 4033429 (1977-07-01), Farr
patent: 4040003 (1977-08-01), Beynet
Doctorial thesis: High Precision In Situ Measurement of Seismic Phase Velocity, by Thomas Luca De Fazio, MIT, Feb. 1971.

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