Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1981-11-16
1984-11-20
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 75, G01V 140, G01V 120
Patent
active
044843135
ABSTRACT:
A system for ascertaining with certainty that detected return acoustic cycles are shear wave cycles for the calculation of shear wave travel times using the known travel time relationship that shear wave travel times are equal to 1.55 to 1.9 times the compressional wave travel time for the same acoustic wave through most geological formations. The system determines the compressional wave travel time and determines after what point following the compression wave return that shear wave cycles are occurring. The validity of the shear wave travel time determinations using shear wave cycles after such time and that no cycles used for such measurement are skipped is assured by determining that the shear wave travel time is within the acceptable limits of 1.55 to 1.9 times the compressional wave travel time.
REFERENCES:
patent: 3900824 (1975-08-01), Trouiller et al.
patent: 4210966 (1980-07-01), Ingram
patent: 4223398 (1980-09-01), Blalock
patent: 4320470 (1982-03-01), Anglern
patent: 4346460 (1982-08-01), Schuster
Scott et al., "Acoustic Logging for Mining Applications", 6/5/74, pp. 1-10.
Koerparich, "Sheer Wave Velocities . . . Devices", pp. 317-326, Sec. of Petr. Eng. Jour., 10/80.
Beard William J.
Halliburton Company
Moskowitz Nelson
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