Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1994-06-08
1995-04-11
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
181102, 367 39, G01V 140
Patent
active
054065305
ABSTRACT:
A non-destructive method of measuring physical characteristics of sediments to obtain a cross-sectional distribution of porosity and permeability values and variations, and of shear modulus and shear strength. A pair of boreholes have borehole entries spaced apart from each other at a predetermined distance, and a plurality of hydrophones are spaced at predetermined known positions. A pseudo-random binary sequence code generator as a source of seismic energy is placed into another borehole and activated to transmit pseudo-random wave energy from the source to the hydrophones. Seismic wave characteristics are measured in a multiplicity of paths extending from the source to the hydrophones, using cross-bore tomography.
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Cunningham, A., "Some Alternate Vibrator Signals," Geophysics, vol. 44, #12, pp. 1901-1921, Dec. 1979.
Kawasaki Steel Corporation
Lobo Ian J.
Miller Austin R.
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