Summary Optimized time-domain pre-migration reprocessing and advanced full-azimuth (FAZ) depth imaging of a 3D rich-azimuth land seismic dataset from the mature Middle Magdalena Valley Basin, onshore Colombia, resulted in a step-change in pre-stack time and depth migrated image quality and resolution, without the need for excessive post-migration processing and amplitude gains, and reliably tied to well logs at Eocene reservoir level. We present a case study in which successful deployment of new-generation processing and imaging techniques, QC processes and advanced depth migration algorithms with Q-compensation was carefully integrated to achieve all imaging and exploration goals. High-frequency absorption was not even reported nor resolved in any legacy processing passes, which illustrates that imaging challenges need to be identified before geophysical solutions can be planned and implemented. Strong Quality Control is vital. The enhanced reflection PSDM image was complemented by depth-domain dip-angle diffraction imaging, adding value to fault characterization in conventional and unconventional (Cretaceous) target intervals. The obtained results provide geologists and interpreters with insight into the Eocene reservoir in the Middle Magdalena Valley, Colombia. Diffraction imaging, applied onshore, is capable to show details otherwise considered subseismic, related to small faults, fractured zones, and other subtle seismic features.