Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1995-09-29
1997-03-11
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
364421, G01V 100, G01V 136
Patent
active
056108753
ABSTRACT:
A method for using a compressional-wave source to produce converted shear waves which are subjected to Alford 4-component rotation to align the observation coordinates with the natural coordinates of the principal anisotropic axes of a birefringent formation. The static time shift between the fast and the slow shear wavefields due to shear-wave splitting is determined so that they can be synchronized thereby to isotropize the birefringent formation. From those data, fracture-plane orientation can be determined. Based on those data, the direction of a deviated bore hole is aligned perpendicular to the fracture plane strike. For a deep-seated target formation, shallower layers are isotropized prior to rotation and synchronization of the converted shear wavefields originating from that deeper formation.
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patent: 5142501 (1992-08-01), Winterstein
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Alford, R. M., Amoco Production Co., "Shear Data in the Presence of Azimuthal Anisotropy: Dilley, Texas", Seismic 9, S9. 6, pp. 476-479.
Garotta, Robert and Granger, Pierre Yves; CGG, France, "Acquisition and Processing of 3C .times. 3-D Data Using Converted Waves", S 13. 2, pp. 995-997.
Mallick, Subhashis and Frazer, L. Neil, "Reflection/transmission coefficients and azimuthal anisotropy in marine seismic studies", Geophys. J. Int. (1991) 105, 241-252.
Knox William A.
Lobo Ian J.
Western Atlas International Inc.
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