Abstract:In order to obtain the saturation calculation model method of low resistivity oil and gas reservoir, this paper takes the sandstone gas reservoir of Paleogene Ziniquanzi formation in Mahe gas field in the southern margin of Junggar Basin as an example, establishes Archie model with variable parameters and W-S saturation model with consideration of temperature change through experimental analysis of porosity and permeability, rock electricity, cast thin section and cation exchange capacity, and analyzes cation exchange capacity CEC and cation exchange capacity Based on the variation law of equivalent conductivity B, cation exchange capacity QV, cementation index m and saturation index n, the calculation method of water saturation suitable for low resistivity sandstone gas reservoir is established. The results show that: in the low resistivity sandstone gas layer, the conventional Archie model is suitable for the water layer with low pure gas production or low resistivity, but the interpretation effect is poor in the same layer of gas and water, and the water saturation values calculated by the variable parameter Archie and W-S model meet the characteristics of the lower water saturation and the upper water saturation of the same reservoir, and the results are consistent with the core analysis and gas testing The results are consistent. The two new saturation calculation models have important guiding significance for effectively improving the accuracy of reservoir saturation interpretation and fluid identification in low resistivity sandstone gas reservoirs.