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VISCOELASTIC SEISMIC RESPONSES OF 2D RESERVOIR MODELS1
- Source: Geophysical Prospecting, Volume 41, Issue 2, Feb 1993, p. 149 - 163
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- 27 Apr 2006
Abstract
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 (Q9, and Qs, as well as in density (ρ) and compressional‐ and shear‐wave velocities (Vp, and Vs).
Reflections produced by Q contrasts alone may have amplitudes as large as those produced by velocity contrasts. Q effects, including their interaction with Vp, Vs 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.