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VISCOELASTIC SEISMIC RESPONSES OF 2D RESERVOIR MODELS 1
Author(s) -
KANG I. B.,
McMECHAN GEORGE A.
Publication year - 1993
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1993.tb00863.x
Subject(s) - geology , seismogram , attenuation , viscoelasticity , seismology , shear waves , synthetic seismogram , anelastic attenuation factor , amplitude , shear (geology) , seismic wave , seismic anisotropy , dispersive body waves , mineralogy , geophysics , optics , physics , petrology , mantle (geology) , thermodynamics
A bstract The use of relaxation mechanisms has recently made it possible to simulate viscoelastic ( Q ) effects accurately in time‐domain numerical computations of seismic responses. As a result, seismograms may now be synthesized for models with arbitrary spatial variations in compressional‐ and shear‐wave quality factors ( Q 9 , and Q s , as well as in density (ρ) and compressional‐ and shear‐wave velocities ( V p , and V s ). Reflections produced by Q contrasts alone may have amplitudes as large as those produced by velocity contrasts. Q effects, including their interaction with V p , V s and p , contribute significantly to the seismic response of reservoirs. For band‐limited data at typical seismic frequencies, the effects of Q on reflectivity and attenuation are more visible than those on dispersion. Synthetic examples include practical applications to reservoir exploration, evaluation and monitoring. Q effects are clearly visible in both surface and offset vertical seismic profile data. Thus, AVO analyses that neglect Q may produce erroneous conclusions.