Method and apparatus for determining propagation velocities of e

Details Method and apparatus for determining propagation velocities of e Method and apparatus for determining propagation velocities of e

1983-01-31

1989-10-17

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 25, 367 34, 34087013, G01V 140

Patent

active

048751979

ABSTRACT:
A method of measuring the propagation velocity of one or more of a plurality of different types of elastic waves in a borehole. It employs a source of elastic waves at a given location in a borehole. The elastic waves generated have a given known frequency. There are a plurality of receivers spaced at different distances from the source. The signals developed by the receivers are digitally multiplexed at a high scan rate relative to the generated frequency. Then the multiplexed signals are analyzed to determine the wave lengths of the received signals. From the wave lengths the propagation velocities, v, may be computed by using the fundamental relationship v=f.lambda., in which f is the frequency and .lambda. is the wave length.

REFERENCES:
patent: 3369182 (1968-02-01), Reindl
patent: 4419748 (1983-12-01), Siegfried, II
"Elastic-Wave Velocity Measurements . . . ," Geophysics, vol. 40, #6, Dec. 1975, pp. 955-960.

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