Broadband resonant wave downhole seismic source

Details Broadband resonant wave downhole seismic source Broadband resonant wave downhole seismic source

1992-06-29

1993-12-07

Eldred, J. Woodrow

Acoustics

Geophysical or subsurface exploration

Well logging

367911, 367912, 181102, G01V 140

Patent

active

052685373

ABSTRACT:
Method and apparatus for generating resonant broad band pressure waves in a fluid-filled wellbore for seismic exploration. In the preferred embodiment, a device is provided in a borehole; the device comprises a cylindrical choke body and a means at each end of the choke body for partially or completely blocking off the borehole and creating a fluid-filled borehole cavity. The fluid inside the cavity is oscillated to establish a standing pressure wave of a desired bandwidth in the fluid. The standing wave is radiated through the wellbore into the earth formation and is received by seismic detectors. The fluid is oscillated over a range of frequencies to generate more information about the earth formation.

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