Synthetic Study of Azimuthal AVO Analysis with Anisotropic Spreading Correction Ellen (Xiaoxia) & Ilya

Acknowlegment Andreas Rueger

Model Geometry

Spreading: Moveout Parameters

Moveout-based Anisotropic Spreading Correction (MASC)  input parameters  pick the raw amplitude  remove the source and receiver directivity  correct for geometrical spreading  calibrate the corrected amplitude

Moveout-based Anisotropic Spreading Correction (MASC)  input parameters,  pick the raw amplitude  remove the source and receiver directivity  correct for geometrical spreading  calibrate the corrected amplitude

Parameters for Orthorhombic Media

Model 1 x1x1 x2x2 x3x3

Synthetics for Model 1 Time (s) Offset (km) azimuth 0 o azimuth 45 o azimuth 90 o

Reconstructed Reflection Coefficients Horizontal slowness (s/km) azimuth 0 o azimuth 90 o azimuth 45 o

Comparison of Spreading Offset (km) azimuth 0 o azimuth 90 o azimuth 45 o Spreading (km)

Reconstructed RCs using t 2 gain Horizontal slowness (s/km) azimuth 0 o azimuth 45 o azimuth 90 o

Model 2 x1x1 x2x2 x3x3

Synthetics for Model 2 Offset (km) Time (s) azimuth 0 o azimuth 45 o azimuth 90 o

Reconstructed Reflection Coefficients Horizontal slowness (s/km) azimuth 0 o azimuth 45 o azimuth 90 o

Reconstructed RCs using t 2 gain Horizontal slowness (s/km) azimuth 0 o azimuth 45 o azimuth 90 o

Model 3 x1x1 x2x2 x3x3

Synthetics for Model 3 Time (s) Offset (km) azimuth 90 o azimuth 45 o azimuth 0 o

Reconstructed Reflection Coefficients Horizontal slowness (s/km) azimuth 0 o azimuth 90 o azimuth 45 o

Reconstructed RCs using t 2 gain Horizontal slowness (s/km) azimuth 0 o azimuth 90 o azimuth 45 o

Influence of Transmission Loss Horizontal slowness (s/km) Model azimuth 0 o azimuth 90 o azimuth 45 o

Conclusions RCs accurately reconstructed fits into processing sequence critical for quantitative AVO important for qualitative AVO transmission loss negligible

Acknowledgment Andreas Rueger Debashish Sarkar Dave Ken