The heterogeneity of gypsum- bearing dolomitized reservoirs is a crucial issue in understanding their formation mechanisms. This study, employing a multidisciplinary approach encompassing petrographic, geophysical, and geochemical analyses, investigates the influence of gypsum and calcite fill cements on the quality of these reservoirs. Through the examination of porosity distribution, origin, and semi- quantitative reconstruction, several key findings emerged.Firstly,calcite cements and gypsum have completely filled fractures and vugslocated in close proximity to fault zones.This extensive infilling process has resulted in significantly reduced porosity and permeability in the carbonate rocks adjacent to these fractures. Secondly, the fluid responsible for gypsum precipitation originated from the underlying Gaotai Formation, characterized by gypsum- rich carbonate successions. This precipitation was induced by the mixing of sulfate- , calcium- , and magnesium- rich fluids under high temperature and pressure conditions. Finally, the diagenetic parasequence preceding the Yanshan tectonic movement exhibits comparable characteristics, while the faults induced by thrust tectonic during the Yanshan- Himalayan tectonic event significantly controlled the differential evolution of porosity in the dolomitized reservoirs.