METHOD AND APPARATUS FOR ANISOTROPIC VECTOR PLANE WAVE DECOMPOSITION FOR 3D VERTICAL SEISMIC PROFILE DATA

摘要

A wavefield separation method and apparatus for 3D VSP data, which handlesarbitrary 3D source and receiver geometries, and common shot 3C data orientedto North,East and Vertical geographical coordinates and makes use of anisotropic mediumproperties at the downhole receivers. When given a range of propagationangles,slowness and polarization vectors are computed for each plane wave and alinear systemis solved at each frequency to yield the scalar plane-wave amplitudes. A novelregularization scheme is used that obviates the need for eigen analysis of thesteeringmatrix. Sums within subsets of these scalar plane waves are constructed toprovide upand down qP (P), qS (Sv) and Sh wavefields. Vector residuals can be computedforparameter testing, quality control and imaging purposes.