Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1983-08-25
1985-05-07
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367912, 367180, 367160, 367 25, 310331, 181104, G01V 140
Patent
active
045162280
ABSTRACT:
A borehole logging system employs a compressional wave transmitter and a shear wave transmitter. The transmitters are alternately fired to impart compressional and shear waves into the formations surrounding the borehole. A bender-type receiver, spaced apart from the transmitter in the borehole is alternately gated so that the voltages across its pair of piezoelectric planar surfaces are subtracted during the expected time period of symmetrical motion of the receiver to provide a compressional wave output and added during the expected arrival time period of unsymmetrical motion of the receiver to provide a shear wave output.
REFERENCES:
patent: 3187300 (1965-06-01), Brate
patent: 3276533 (1966-10-01), Pickett et al.
patent: 4383308 (1983-05-01), Caldwell
Quantitative Seismology Theory and Methods, vol. 1, by K. Aki and P. G. Richards, W. H. Freeman and Company.
Elements of Acoustical Engineering, by Harry F. Olson, D. Van Nostrand Company, Inc., 2nd printing.
"A New Method for Shear-Wave Logging", Geophysics, vol. 45, No. 10, Oct. 1980, pp. 1489-1506, by Choro Kitsunezaki.
Gilman Michael G.
Hager Jr. George W.
Lobo Ian
McKillop A. J.
Mobil Oil Corporation
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