The Leikoupo Formation marine tidal-flat dolomite gas reservoir in western Sichuan Basin is characterized by deep burial depth and high sulfur content. Reservoir pores, vugs, and fractures are developed to varying degrees, resulting in strong heterogeneity, and economically efficient development requires relatively high single-well productivity. However, reservoir classification schemes and lower-limit criteria established using conventional methods show inconsistencies between logging interpretation results and well test outcomes in some wells. To address this issue, combined Nuclear Magnetic Resonance-CT scanning experiments before and after core acidification were designed. By measuring the Nuclear Magnetic Resonance T₂ spectra and CT imaging of cores before and after acidification, and extracting petrophysical and pore structure parameters using digital core technology, the effects of petrophysical changes induced by acidification on pore structure improvement in the Leikoupo Formation dolomite reservoirs were comparatively analyzed. The petrophysical thresholds for economically efficient development were further investigated.The results indicate that: (1) core NMR-derived porosity, permeability, and the peak value of movable fluid T₂ spectra exhibit positive correlations with pore-throat parameters, and both pore structure and connectivity of the cores are improved to varying degrees after acidification; (2) when porosity ranges from 4% to 8%, pore structure parameters and connectivity show significant improvement, whereas the enhancement is relatively limited when porosity is ≥8% or < 4%. Through integrated experimental analysis and typical well case studies, petrophysical classification criteria for evaluating tidal-flat dolomite reservoirs of the Leikoupo Formation were established, providing important technical support for gas reservoir development.