Abstract

Phase decomposition provides a powerful tool for enhancing seismic interpretation in thin-bed settings, where conventional amplitude-based methods often fall short. By isolating specific phase components, subtle impedance variations masked by tuning and interference effects become more interpretable. This paper demonstrates the application of phase decomposition to improve reservoir characterization using both synthetic and real seismic data. A synthetic modelling exercise illustrates how different phase rotations (0°, +90°, and -90°) highlight interference patterns and amplitude variations related to stratigraphic complexity and fluid substitution. These insights are then applied to 3D PSTM seismic data from the study area in the Western Offshore Basin of India. The study shows that the - 90° phase component is particularly effective in enhancing the visibility of hydrocarbon-related anomalies and separating tuning artifacts from true fluid responses. This analysis confirms that phase decomposition is a valuable complement to traditional interpretation workflows and can significantly enhance reservoir delineation in complex offshore clastic systems.