Abstract: Da’anzhai oil reservoirs are the chief production zones of Chuanzhong oil field. Most of oil and gas are from the Da’anzhai carbonate formation. With the long time past, the out-put decreases and some wells are even exhausted. So it is much necessary to study the oil-bearing characteristics and predict the output. In the paper, the reservoirs are classified into three
types by oil productivity: dry zones, low production zones and high production zones. The qualitative characteristics of the dif-ferent types are reduced according to the information of well logging, geology and production test, and the models of produc-tion formation are set up. Eventually, the methods are formed,which is used to select pay zone and predict the productivity.

Key words: productivity prediction, the oil-bearing charac-teristics, Da’anzhai