Method for identifying weak sands

Details Method for identifying weak sands Method for identifying weak sands

1980-04-21

1982-01-19

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367912, 181104, 181401, G01V 1047, G01V 1053, G01V 140

Patent

active

043120520

ABSTRACT:
A method and apparatus for obtaining improved measurements of shear waves in low-velocity lossy formations surrounding a borehole. The method comprises forming an interface between the borehole wall and a solid homogeneous material having a lower velocity than the formation. The geometry and velocity of the homogeneous material provide enhancement of the shear waves at the interface and thereby minimize the effect of interference from undesired compressional waves. Further improvement is obtained by using shear waves whose particles move perpendicular to the travel of the wave, parallel to the plane of the waves and perpendicular to the surface of the material. These are commonly referred to as SV shear waves.

REFERENCES:
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patent: 2943694 (1965-07-01), Goodman
patent: 3542150 (1976-11-01), Youmans
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patent: 3775739 (1973-11-01), Vogel
patent: 3883841 (1975-05-01), Norel et al.
patent: 3949352 (1976-04-01), Vogel
patent: 3973152 (1976-08-01), Korglus
Evans, "Seismic Model Experiments with Shear Waves", pp. 40-48, Geophysics, vol. 24, #1, 2/59.

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