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US 4,321,981 AGranted
Combination shear wave and compressional wave seismic energy vibrator
AssigneeConoco Inc.
InventorKenneth H. Waters
Life of this patent
Estimating the term…
Abstract
A combination of fixed geometry of vibrating masses on a baseplate coupled to the ground, the masses being at a fixed angle to each other and of relatively variable phase, can be controlled to produce both compressional and shear waves simultaneously in a seismic exploration system.
Claims14
A method for simultaneous inducement of shear and compressional seismic waves into an earth medium, comprising:
- inducing vibration to an earth coupled baseplate along a first axis disposed at a first angle in a plane transverse to the baseplate;
- and
- simultaneously inducing vibration to said earth coupled baseplate along a second axis disposed at a selected second angle in a plane transverse to the baseplate and parallel to said first mentioned plane and oriented opposite to sid first angle such that both a vertical and horizontal vibration component is coupled into said earth medium.
Apparatus for generation of shear and compressional seismic waves in an earth medium, comprising:
- baseplate means for coupling vibrational energy into the earth medium;
- first vibrator means secured to said baseplate means to vibrate along an axis disposed at a first angle in a first plane transverse to said baseplate means;
- second vibrator means secured to said baseplate means to vibrate along an axis disposed at a second angle of opposite orientation and disposed in a second plane transverse to said baseplate means wherein said first plane is parallel to said second plane;
- and
- control means for actuating said first and second vibrator means in preselected phase relationship.
2 more elements
Dependencies are inferred from the claim text.