Method for measuring seismic phase shift of compressional wavefo

Details Method for measuring seismic phase shift of compressional wavefo Method for measuring seismic phase shift of compressional wavefo

1982-11-01

1985-11-19

Cangialosi, Salvatore

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 40, G01V 128

Patent

active

045546479

ABSTRACT:
Seismic pulse waveforms are generated for travel through subsurface formations. Both normally-reflected and obliquely-reflected waveforms from subsurface interfaces are recorded. The differential phase change between the normally-reflected and obliquely-reflected waveforms are determined for each interface. The fluid characteristics of the porous subsurface layers are identified as gas-saturated or water-saturated in response to the relative amounts of phase change, a gas-saturated layer providing a larger phase change than a water-saturated phase change.

REFERENCES:
patent: 3836952 (1974-09-01), Johnson
"Bright Spot in the Energy Picture" Ocean Industry, Article, Feb. (1974), pp. 60-65.
Choy et al., "Pulse Distortion and Hilbert Transformation in Multiply Reflected and Refracted Body Waves," Bulletin of the Seismological Society of Amer., vol. 65, No. 1, pp. 55-70, Feb. (1975).

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