Technical Paper: Anisotropic effects on density information extraction from PS waves (S-Zero Stack)

Society: SEG
Paper Number:
Presentation Date: 2009
 

S-Zero Stack, as a new method to extract robust density information of subsurface from converted waves, has been introduced last year (Zou, 2008). This method separate share velocity effect from density effect analytically in PS reflection equation (Aki & Richard, 1981), thus a special stacking method can be designed to capture density variation at subsurface using PS reflection alone. As common practice of oil industry, this method has been based on a basic assumption of steady-state plan waves propagating in homogeneous layers with small elastic parameter variations at layer interfaces. In this paper, we will discuss S-Zero Stack under anisotropic consideration. The exact converted wave propagation in anisotropic media is too complex to handle. Plan waves that propagate in transversely isotropic media with weak anisotropy assumption (Thomsen, 1993) are the cases we may considered in this paper. Also, uncertainty in Dr /r estimation using the method has been included in this paper.

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