Seismic surveying technique for the detection of azimuthal varia

Details Seismic surveying technique for the detection of azimuthal varia Seismic surveying technique for the detection of azimuthal varia

1984-07-20

1989-03-28

Tarcza, Thomas H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Automatic reclosing

367 36, 367 37, G01V 100

Patent

active

048170615

ABSTRACT:
Polarized shear wave surveys are performed to determine azimuthal variations in the earth's subsurface caused by fracture orientation and density. The surveys may be done by using the same polarization (either horizontal or vertical) shear waves along two different seismic lines of profile, or by using different polarization shear waves along one common line of profile. The survey data are then processed and compared; any differences constitute a measure of fracture orientation and density. Subsurface zones of high fracture density, once identified, have been found to afford a higher likelihood of successful well completion.

REFERENCES:
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patent: 3003577 (1961-10-01), Itria
patent: 3378096 (1968-04-01), Cherry, Jr.
Crampin, "A Review of the Effects of Anisotropic Layering on the Propagation of Seismic Waves", Geophys. J. R. Astr. Soc., (1977), 54, 9-27.
Crampin et al., "The variation of Delays in Stress-Induced Anisotropic Polarization Anomalies", Geophys. J. R. Astr. Soc., (1981), 64, 115-131.
Keith et al., "Seismic Body Waves in Anisotropic Media: Reflection and Refraction at a Plane Interface", Geophys. J. R. Astr. Soc., (1978), 53, 467-496.
Crampin et al., "Estimating Crack Parameters from Observations of P-Wave Velocity Anisotropy", Geophysics, vol. 45, No. 3, (1980), 345-360.
Crampin, "Seismic Wave Propagation Through a Cracked Solid: Polarization as a Possible Dilatancy Diagnostic", Geophys. J. R. Astr. Soc., (1978), 53, 467-496.

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