The carbonate reservoir of X structure in PuGuang gas field of Sichuan Basin has great potential for gas development and gas-bearing prediction technology plays a key role in the rolling development of the area. The lithology in the area is relatively stable but local feature of porosity changes rapidly. The gas-bearing indicators constructed by conventional methods are affected by changing porosity, resulting in insufficient indicating ability and poor consistency between prediction results and drilled wells. Through rock physics modeling and fluid substitute analysis, fluid indicator mixing between gas- and water-bearing reservoir is clarified; Combining the relevance between porosity and P- and S-wave impedance, a gas-bearing indicator construction method considering the influence of porosity was proposed. Based on prestack inversion and porosity inversion method, a gas prediction workflow of the study area is established and accurate prediction of gas-bearing reservoirs is achieved. The application results indicate that porosity-involved fluid factor can effectively suppress the influence of porosity during gas-bearing prediction, improve the prediction accuracy of gas-bearing reservoirs, and efficiently support exploration and development of the study area.