Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1979-09-19
1982-02-16
Birmiel, Howard A.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 74, 367 50, 367 59, G01V 134, G01V 136
Patent
active
043162681
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 anomalies 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: 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. 1975, pp. 649-661.
"Reflection and Transmission Coefficients for Plane".
Birmiel Howard A.
Buchanan, Jr. J. A.
Chevron Research Company
Freeland, Jr. R. L.
Messner H. D.
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