Application of an Integrated Seismic Petrophysics and Rock Physics Workflow in a Complex Clastic Formation

Several challenges are observed in a clastic formation due to the presence of extensive coal beds, which contributes to wellbore instability and significantly impact seismic amplitude responses. Additionally, the limited availability of reliable shear log data often presents a constraint, as the Vp/Vs ratio is essential for distinguishing lithofacies and evaluating rock mechanical properties. In this study, the widely used Keys and Xu rock physics model is applied to model elastic responses of the clastic mixed sediment. In general, the integrated seismic petrophysics-rock physics workflow includes log data conditioning, seismic petrophysical interpretation, and rock physics modeling. The final rock physics model (RPM) output predicts compressional velocity, shear velocity, and generates the Vp/Vs ratio, capturing lithological and fluid variations consistent with petrophysical volumes and geology. These results provide more meaningful inputs for subsequent seismic inversion and enhance interpretation in complex coal-bedded intervals.