<p>Ultra-deep carbonate strike-slip fault-controlled reservoirs possess substantial exploration potential. To clarify the spatial distribution of hydrocarbon storage and migration pathways, this study focuses on the S-8 fault zone in the Shunbei area, systematically analyzing the internal architecture of fault core–damage zones. An integrated approach combining well testing data, logging interpretation, core observations, and drilling records is adopted. The results reveal that the architecture is characterized by the clustered development of breccia zones and fracture networks, with significant structural variations across different tectonic segments. The pull-apart structures exhibit the widest fault zone widths, featuring fewer but wider breccia zones and densely developed narrow fracture zones. In contrast, compressional uplift structures are marked by narrower fault zones with multiple thin breccia zones and fewer but wider fracture zones. Strike-slip structures display intermediate characteristics with relatively simple architectures. This study provides a novel understanding of the coupling between tectonic stress regimes and the development of fault core–damage zone architectures in ultra-deep carbonate reservoirs, offering valuable insights for the prediction and exploration of similar structurally controlled reservoirs.</p>