Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1978-12-20
1982-02-16
Birmiel, Howard A.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 59, 367 74, G01V 134, G01V 136
Patent
active
043162673
ABSTRACT:
The present invention indicates that gas-containing strata of an earth formation have low Poisson's ratios and that the acoustic contrast with the overburden rock has a surprising effect as a function of the angle of incidence on a seismic wave associated with an array of sources and detectors: viz., a significant--and progressive--change in P-wave reflection coefficient as a function of the angle of incidence occurs. Thus, differentiating between high-intensity amplitude annomalies of nongas- and gas-containing media is simplified: progressive change in amplitude intensity of resulting traces generated by the field array as a function of offset between each source-detector pair, is associated with the last-mentioned medium only.
REFERENCES:
patent: 3354985 (1967-11-01), Sparks
patent: 3381266 (1968-04-01), Harris
patent: 3706069 (1972-12-01), Savit
patent: 3784967 (1974-01-01), Graul
patent: 3806863 (1974-04-01), Tilley et al.
patent: 3921126 (1975-11-01), Waters
"Seismic Signal Processing", Wood et al., Proceedings of the IEEE, vol. 63, Apr. 75, pp. 649-661.
"Reflection and Transmission Coefficients for Plane Longitudinal Incident Waves", Koefed, Geophysical Prospecting, vol. 10, No. 3, 1962.
Birmiel Howard A.
Chevron Research Company
Keeling Edward J.
Messner H. D.
Newell D. A.
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