True Amplitude Prestack Imaging of Converted Waves

Nicoletis, L.; Svay-Lucas, J.; Prigent, H.

doi:10.3997/2214-4609.201406694

Cited by 2 publications

(1 citation statement)

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“…Nicolétis et al, 1998) and anisotropic (e.g., Riste and Fjellanger, 2000) materials. Depth migration of P-S data can be accomplished (Kendall et al, 1998;Hoffe and Lines, 1999), which, in addition to possibly better imaging, creates P-P and P-S sections sharing the same depth axis (as opposed to raw P-P and P-S time axes).…”

Section: P-s Data Processingmentioning

confidence: 99%

Converted‐wave seismic exploration: Methods

Gaiser²,

et al. 2002

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Multicomponent seismic recording (measurement with vertical-and horizontal-component geophones and possibly a hydrophone or microphone) captures the seismic wavefield more completely than conventional single-element techniques. In the last several years, multicomponent surveying has developed rapidly, allowing creation of converted-wave or P-S images. These make use of downgoing P-waves that convert on reflection at their deepest point of penetration to upcoming S-waves. Survey design for acquiring P-S data is similar to that for P-waves, but must take into account subsurface V P /V S values and the asymmetric P-S ray path. P-S surveys use conventional sources, but require several times more recording channels per receiving location. Some special processes for P-S analysis include anisotropic rotations, S-wave receiver statics, asymmetric and anisotropic binning, nonhyperbolic velocity analysis and NMO correction, P-S to P-P time transformation, P-S dip moveout, prestack migration with two velocities and wavefields, and stacking velocity and reflectivity inversion for S-wave velocities.Current P-S sections are approaching (and in some cases exceeding) the quality of conventional P-P seismic data. Interpretation of P-S sections uses full elastic ray tracing, synthetic seismograms, correlation with P-wave sections, and depth migration. Development of the P-S method has taken about 20 years, but has now become commercially viable.

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