Abstract: Eeleven calculating models are applied to calculating compressibility factor of condensate gas reservoir in Junggar basin and making a correlation of the results. The calculation model is found for early forecasting compressibility factor of both common natural gas reservoir and condensate gas reservoir. Also, the correction method of compressibility factor is found for AGA8-92DC model, HTP model, SHBWR model, SRK model and low-pressure Z-model. The calculated results show that the maximum average error is reduced to 0.92% from 5.64% with greatly increasing accuracy of such a prediction.

Key words: Junggar basin, condensate gas, compressibility factor, model, method