3-D converted shear wave rotation with layer stripping

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type

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364421, G01V 100, G01V 136

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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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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.

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