Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1982-03-10
1986-01-14
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367190, 367 47, 364421, G01V 124, G01V 136
Patent
active
045649278
ABSTRACT:
A method of seismic exploration, wherein one or more vibratory sources are employed to generate an input signal whose frequency varies as a function of time and wherein the signal is reflected and refracted to detector stations from subsurface beds, in which the sources are tested for signal accuracy with respect to a reference. The method includes generating at a first location a system reference signal having a pattern of predetermined phase and frequency characteristics and generating at a first source a vibrator control signal or a motion detector signal. The vibrator control signal or the motion detector signal is converted to constant amplitude so that the signal pattern is represented principally by phase and frequency. The system reference signal is correlated with the vibrator control signal or the motion detector signal to generate a cross-correlation function. At the first location a model function is generated and a selected characteristic of the model function is compared with similar characteristics of the cross-correlation function to obtain an indication of the accuracy of the vibrator signal. The source being checked will be utilized in exploration only if the accuracy exceeds a certain level.
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"Correlation Techniques--A Review," N. A. Anstey, Journal of Canadian Society of Exploration Geophysicists, vol. 2, #1, Dec. 1966, pp. 1-28.
Seriff et al., "Effect of Harmonic Distortion in the Use of Vibratory Surface Sources," 4/70, pp. 234-246.
Interoffice Memo of Mandrel Industries, Inc., 3/23/73, "Vibrator Similarity".
Instructional Manual from Pelton Co., Inc., 12/80, pp. 12-16.
Crocker National Bank
Lobo Ian J.
Moskowitz Nelson
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