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US 6,152,256 AGranted
Method for controlling seismic vibrator ground forces
AssigneeAspect Resources LLC
InventorsPaul Favret, Evan B. Genaud
Life of this patent
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AssigneeAspect Resources LLC
InventorsPaul Favret, Evan B. Genaud
Estimating the term…
A method used for controlling vibrator ground force output from a seismic vibrator and reducing potential damage to nearby structures. The method may be applied to any type of seismic vibrator for controlling the amount of vibrator force output applied to a ground subsurface. The subject method controls the vibrator force output as a function of frequency to form a force variable sweep. Low frequency waves are harmful to structures. The force variable sweep reduces the percentage of harmful low frequency waves while imparting a great deal of energy. The method steps include first selecting and constructing a frequency dependent force function from either a hyperbolic tangent function mathematical equation or a simple step function mathematical equation. Second, implementing a seismic vibrator frequency control instrument with the selected frequency dependent force function. Third, applying the force function to either a seismic upsweep or a seismic downsweep. Fourth, generating 20 percent of a total force output in a frequency range of 2 to 50 Hz. The last step, increasing the output to 80 percent of the total force output in a frequency range of 50 to 100 Hz.
A method used for controlling vibrator ground force output from a seismic vibrator and reducing potential damage to nearby structures, the method controls the vibrator force output from the vibrator as a function of frequency to form a force variable sweep, the steps comprising:
A method used for controlling vibrator ground force output from a seismic vibrator and reducing potential damage to nearby structures, the method controls the vibrator force output from the vibrator as a function of frequency to form a force variable sweep, the steps comprising:
A method used for controlling vibrator ground force output from a seismic vibrator and reducing potential damage to nearby structures, the method controls the vibrator force output from the vibrator as a function of frequency to form a force variable sweep, the steps comprising:
Dependencies are inferred from the claim text.