Abstract: Mesozoic erosion thickness of Bongor Basin was restored using mudstone acoustic time difference method, vitrinite refl ectance (R o) method, and stratigraphic correlation method. Result showed that the erosion thickness ranged from 1000 to 2000 m, thick in northern and southern slope while thin in central sag. The quick but intense uplift preserved the good reservoir quality of the P Formation sand body in the lower play. The compressive stress during inversion folded the strata and contributed to the formation of a lot of faulted anticlines and noses which were excellent traps for hydrocarbon accumulation. The fault reactivation triggered by inversion promoted the hydrocarbon migration in Bongor Basin.