Parsimonious migration of 3-C 3D VSP data

作者: Yogesh Agnihotri , George A. McMechan

DOI: 10.1190/1.2780221

关键词: GeologySlownessAzimuthRay tracing (physics)Seismic waveVertical seismic profileGeodesyLinear polarizationPolarization (waves)Seismic migration

摘要: Conventional Kirchhoff migration can be made much faster by a priori calculation of wave arrival directions, and tracing rays back only along the measured directions; this is known as parsimonious migration. For surface seismic data, where acquisition with 2D arrays common, directions using local slant stacking to calculate two horizontal slowness components. The vertical then deduced dispersion relation. profile (VSP) multiline not possible, component vector measured, which insufficient constrain direction. We overcome limitation for three-component VSP data polarization analysis incident waves. Polar azimuth anglesare calculated at receivers estimating covariance matrix slowness, assuming isotropic media linear both P- S-waves. P-waves, co...

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