Abstract: As a whole,P oilfield is a typical thin interbedded reservoir,which is characterized by uneven reservoir thickness,thin layer development,rapid lateral change of reservoir,poor reservoir connectivity,and less testing and production performance data,so it is difficult to predict the real water flooding degree. The corresponding rate of injection and production in water flooding reservoir directly determines the water flooding degree,which has an important impact on the prediction accuracy of key indicators such as recovery rate,decline rate and water cut rise rate. Based on the comparison on the geological fine layers,starting from the injection production corresponding rate of thin interbedded reservoirs,the average static injection production connectivity rate of the oilfield is about 75%. Further analysis of the pressure measurement while drilling data and actual production data shows that the actual dynamic injection production corresponding rate of the reservoir is 70%. Through the establishment of a typical numerical model which can represent the geological characteristics of thin interbedded reservoir,the influence of injection production corresponding rate on decline rate,recovery rate and water cut rise rate is judged. The results show that under the same liquid production rate,the higher the injection production corresponding rate,the smaller the decline rate;On the contrary,the greater the decline rate. With the increase of the injection production corresponding rate,the oil recovery rate and water cut rise rate are also increased.

Key words: thin interbedded reservoir, water flooding, decline rate, oil recovery rate, water cut rise rate