Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1980-10-10
1984-11-06
Wilbur, Maynard R.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
181103, 181106, 181113, 181117, G01V 1053, G01V 140
Patent
active
044816120
ABSTRACT:
The shear wave source of this invention includes a housing and means for applying forces to the shot hole wall. The force applying means applies a number of forces to the shot hole wall along lines normal to a plane close to the shot hole. No pressure waves, but only shear waves are generated at distant points on the plane. At least one of the forces is applied in opposite direction to the other forces to reduce the net recoil of the housing.
A first, second and third force are applied at three source points in the observation plane along three lines normal to the plane to generate respectively a first, second and third shear wave in the plane. The first and third forces are equal in magnitude and the second force has twice the magnitude of the first force. The first and third forces are applied along lines in the same direction, but the second force is applied along a line opposite in direction to the lines of the first and third forces. The three forces are so applied that, at any distant point on the observation plane, the second shear wave lags the first shear wave in phase by a predetermined amount and a third shear wave lags the second shear wave in phase by the same amount. The three shear waves will interfere to produce a resonance. Generation of shear waves with frequencies at or close to the resonance frequencies is thereby enhanced, and generation of shear waves with other frequencies is thereby retarded.
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Equitz Alfred A.
Exxon Production Research Co.
Hsue James S.
Kaiser K. R.
Wilbur Maynard R.
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