Z-99 COMPARING FULL AZIMUTH 9C & 3C DATA POLARIZATION ANALYSIS USING PRESTACK DATA IN HTI MEDIA P064 Abstract 1 Prestack polarization analysis was conducted using both direct controlled source polarization shear wave data and converted shear wave (P-SV) data with multiple azimuths in both isotropic and anisotropic media. Comparison between results obtained using a four horizontal component rotation for direct shear waves from 9C data and an equivalent method using dual compressional source multi-azimuth converted wave from either 3C or 4C data were made in both isotropic and anisotropic media. Using four-component rotation algorithms we found that equivalent results are

A29 ANISOTROPIC ANALYSIS OF 3C DATA AND COMPARISON TO 9C DATA 1 J. E. GUMBLE 1 J. E. GAISER 2 AND R. H. TATHAM 1 1 The University of Texas Jackson School of Geosciences Department of Geological Sciences 1 University Station C1100 Austin Texas 78712-0254 USA 2 WesternGeco Denver CO 80202 USA Abstract Polarization analysis was conducted using both direct controlled source polarization shear wave (9C) data and converted shear wave (P-SV) data recorded for several source-receiver azimuths in both isotropic and anisotropic media. Anisotropic results are obtained using various methodologies including but not limited to four component rotation analysis

E009 PRESTACK LAYERSTRIPPING EVALUATION: CONSTANT ROTATION AND SHIFT OPERATORS IN HTI/TTI MEDIA Abstract 1 Prestack layer stripping was applied to azimuthally anisotropic (HTI and TTI) synthetic seismic data sets for evaluating constant rotation and shift operators. Equivalent isotropic models were compared to layer-stripped anisotropic models using RMS amplitude and shear-wave splitting time difference maps to quantify and qualify the error. It is found that in HTI media layer-stripped radial and transverse components exhibited incorrect symmetry and orientations and there are significant distortions in the amplitudes that could adversely affect inversion and/or AVO and AVAZ analysis. However layer-stripped PS1 and PS2

Prestack layer stripping was applied to azimuthally anisotropic (HTI and TTI) synthetic seismic data sets for evaluating constant rotation and shift operators. Equivalent isotropic models were compared to layer-stripped anisotropic models using RMS amplitude and shear-wave splitting time difference maps to quantify and qualify the error. It is found that in HTI media layer-stripped radial and transverse components exhibited incorrect symmetry and orientations, and there are significant distortions in the amplitudes that could adversely affect inversion and/or AVO and AVAZ analysis. However, layer-stripped PS1 and PS2 components exhibit the correct symmetry and orientation even though their amplitudes are incorrect. Time differences between PS1 and PS2 are computed using a cross-equalization spectral analysis. This problem has been studied extensively for vertical fractures (HTI media) and post-stack layer-stripping analyses; therefore this study includes an equivalent model with dipping fractures (TTI media). The results from an application of the same cross-equalization method are also applied to a receiver gather from the Teal South data set in the Gulf of Mexico.