In fractured volatile oil reservoirs，the fractures are well developed. The conventional water flooding development shows the production characteristics of ineffective water injection. Consequently，there is an urgent need to explore methods to enhance the oil recovery of volatile oil reservoirs. Given the richness of associated gas resources in volatile oil reservoirs，the associated gas flooding has emerged as an economically viable and effective strategy for enhancing oil recovery. To clarify the microscopic pore-throat mobilizing characteristics and feasibility of associated gas flooding in fractured volatile oil reservoirs，this study employed in-situ nuclear magnetic resonance（NMR）displacement imaging technology to investigate pore-throat mobilization characteristics under varying reservoir types，fracture orientations，and gas injection rates. Finally，the numerical simulation was employed to predict the associated gas flooding development effect of Well Group K-001 in K Oilfield. Results reveal that water flooding primarily mobilizes oil in microscale micropores（1-10 μm）and microscale macropores（>10 μm），achieving maximum recovery of 37.2%，with remaining oil predominantly retained in submicron pores （0.1-1 μm） and microscale micropores.Associated gas flooding enhances oil recovery by improving mobilization efficiency in microscale micropores（4%）and submicron pores（9%）. NMR imaging demonstrates that volatile oil near the outlet in matrix cores is mobilized under the dual effects of dissolved gas and associated gas，while oil near fractures in fractured cores is primarily mobilized via localized pressure differences between fractures and the matrix. Fracture orientation and gas injection rate are critical factors influencing recovery. Increasing the fracture width or injection rate could reduce mobilization efficiency in microscale pores and submicron pores，leading to an approximately 2% decline in recovery. Numerical simulations of Well Group K-001 confirm that associated gas flooding further enhances recovery after waterflooding，with water-alternating-gas injection achieving the highest incremental recovery（10%）. This study validates the feasibility of associated gas flooding for enhancing oil recovery in volatile oil reservoirs from an oil reservoir perspective.