Abstract

Amplitude Versus Offset (AVO) analysis is a fundamental technique in hydrocarbon exploration, used to infer fluid content and lithology variations in subsurface formations. However, in clastic reservoirs exhibiting seismic anisotropy, particularly vertical transverse isotropy (VTI), conventional AVO interpretation may yield misleading results. This study investigates the influence of anisotropy on AVO responses through a combination of theoretical analysis, synthetic modeling, and well-log based seismic simulations. In order to simulate seismic wave behavior and amplitude variation with offset, forward modeling was carried out in both isotropic and anisotropic media. Using well log data from clastic sequences, realistic VTI parameters were integrated into the creation of synthetic seismograms. The ensuing AVO responses showed that anisotropy changes the amplitude behaviors, possibly making fluid impacts more difficult to see or detect. A well-to-seismic tie was also performed to validate the synthetic results against real seismic data, confirming that anisotropy must be explicitly considered for accurate reservoir interpretation. This work highlights the critical role of anisotropy in AVO analysis, offering both theoretical and practical guidance for its integration into reservoir characterization. The findings advocate for a paradigm shift in seismic interpretation practices, moving beyond isotropic assumptions to achieve more accurate and reliable subsurface evaluations in anisotropic clastic environments.