Beyond Structural Interpretation: Multiparameter Full-Waveform Impedance Inversion

Summary Seismic imaging has traditionally relied on migration-based methods like Reverse Time Migration (RTM) and Least-Squares RTM (LSRTM). However, these approaches face challenges such as illumination imbalance and amplitude fidelity issues. Full-Waveform Inversion (FWI) offers an alternative by leveraging the full wavefield to recover Earth properties, but monoparameter FWI, which focuses solely on P-wave velocity (Vp), often suffers from parameter crosstalk and density leakage. This study introduces a multiparameter FWI framework that jointly inverts for velocity and impedance (Vp, Ip), enabling the extraction of high-resolution FWI-derived reflectivity (FDR). Unlike conventional migration, FDR is computed directly from the impedance model, offering balanced illumination, improved resolution, and amplitude consistency. Through a field dataset, we demonstrate that FDR outperforms RTM by providing clearer subsurface images, superior fault delineation, and enhanced stratigraphic interpretation. By incorporating impedance updates, this method significantly enhances structural imaging and reservoir property analysis. The transition from conventional migration to high-resolution FDR marks a paradigm shift in seismic imaging, providing a more accurate and geologically meaningful representation of the subsurface.