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Anisotropic AVO analysis for reservoir characterization in Derby field southeastern Niger delta has been investigated. The objective of this study was to investigate the AVO response of shale over gas sandsonisotropic and anisotropic synthetic models and the real CDP gathers. This was done by plotting amplitude of reflections versus offsets and carrying out AVO intercept-gradient analysison HD1horizon. The results of the models were compared with the real CDP gather to deduce the robust synthetic model for efficient AVO analysis in the field. Well, CDP processed gathers and Hampson-Russell GEOVIEW and AVO module were used for the analysis. Results revealed that the plots of amplitude versus offset of the isotropic and anisotropic synthetic models agree at near offset but show opposite AVO response due to increasing contributions of seismic anisotropy at far offsets. The results of the anisotropic synthetic model correlates well with the CDP gathers indicating that seismic anisotropy is an important factor in AVO analysis. Results also show that a bright spot indicative of gas charged sands was delineated for the isotropic and anisotropic models but with different classes of AVO anomalies andproducts. The isotropic synthetic model show a class II AVO anomaly with a positive AVO product, while the anisotropic model show a class IV AVO anomaly with a negative AVO product comparable to the real CDP gather.These analysesclearly show that description of rock without anisotropy especially, seismic anisotropy is incomplete since most rocks are not completely isotropic. Therefore, accounting for seismic anisotropy in AVO synthetic modelling will ensure that the correct earth model is predicted and the reservoir is adequately characterized.

Anisotropic Avo Analysis for Reservoir Characterization in Derby Field Southeastern Niger Delta