Abstract: Through analyses of the core, well log, geophysical prospecting, test well and production test data, the variation of gas-oil ratio (GOR) of carbonate reservoir of east test area in Tazhong No.1 gas field is reviewed in this paper. The changes with time of the GOR show such four types as the keeping stable, the slow increase, the sustained decrease and the first increase and then decrease. Besed on these, the relationship between the GOR's changes and the reservoir belongs to the apparent homogeneous type, facture system type and dual-porosity medium type.

Key words: Tazhong No.1 gas field, east test area, gas-oil ratio, gas condensate reservoir