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Primary Examiner: Birmiel, Howard A.
Assistant Examiner:
Attorney: Silverman; Daniel

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Title: Method and apparatus for determination of optimum velocity in processing seismic signals from low energy sources

Abstract: A system and method for carrying out seismic operations with low energy sources, which involves operating the source at spaced points along a seismic spread, the source points are spaced far enough apart so that their seismic waves originate at different points and travel by different paths to the geophones. The geophone outputs cannot be time stacked. The geophone signals are amplified at constant gain and digitized to 1 bit. If the low energy source is a vibratory source, the 1 bit signals are correlated with a 1 bit version of the sweep signal. The resulting correlograms are digitized to 1 bit and C.D.P. stacked and displayed. If the low energy source is impulsive, the 1 bit amplified signals are C.D.P. stacked and displayed. In C.D.P. stacking, the determination of optimum velocity can be carried out by 1 bit processing.

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Inventors: Martin, Lincoln A. (Altadena, CA, US)
Fenley, Jr., William F. (Pasadena, CA, US)

Application Number: 828778
Filing Date: 1977-08-29
Publication_date: 1980-02-19
Assignee: Geophysical Systems Corp. (Pasadena, CA)
Primary Class(es): 367/60 367/40
Other Classes:
US Patent Ref:

3345504	Oct, 1967	Doty	340/15.
3496531	Feb, 1970	Sullivan et al.	340/15.
3638177	Jan, 1972	Lindblade et al.	340/15.
3651451	Mar, 1972	Ruehle	340/15.
3696331	Oct, 1972	Guinzy et al.	340/15.
3714621	Jan, 1973	Waters	340/15.
4001768	Jan, 1977	Fort et al.	340/15.
4021649	May, 1977	Fort et al.	340/15.
4037190	Jul, 1977	Martin	340/15.
4058791	Nov, 1977	Martin et al.	340/15.

Other Refs: Other References: "Velocity Spectra-Digital Computer Derivation and Applications of Velocity Functions", Taner et al., Geophysics, vol. 34, No. 6, pp. 859-881, Dec. 1969.