<p>The Deyang-Anyue Rift Trough, a key tectonic unit within the Sichuan Basin, has emerged as a promising target for deep carbonate hydrocarbon resources in recent years. Nevertheless, critical ambiguities persist in our understanding of its developmental characteristics and tectonic evolution, which have impeded further breakthroughs in regional hydrocarbon exploration. Against this backdrop, precise characterization of the rift trough’s fault structures via advanced gravity-magnetics data processing techniques holds critical implications for deciphering its tectonic evolution and guiding resource exploration. This study introduces an optimized gravity-magnetics cross-gradient joint inversion workflow, wherein improvements in algorithmic weight calculation and parameter adjustment significantly enhance inversion accuracy and result reliability. By applying this refined approach to field-acquired gravity-magnetics profile data from the southern margin of the rift trough and integrating planar gravity anomaly patterns, we systematically map the linear structural features within the rift development zone. Additionally, we infer the fault systems that controlled the trough’s formation and elucidate its structural configuration. These findings not only advance our understanding of the Sichuan Basin’s tectonic evolution but also provide geophysical constraints for hydrocarbon exploration and development in the deep Sinian-Lower Cambrian strata.</p>