童氏图版的改进及在油藏含水率预测中的应用

在研究辽河油区低渗透油田含水率与采出程度关系的基础上，采用统计学方法，通过对童氏含水率与采出程度关系图版进行改进，把童氏图版标准公式中由中、高渗透油藏统计的常数7．5，换成由辽河油区低渗透油藏统计的常数21．87，使其符合低渗透油田的含水率与采出程度变化规律。实践证明：用改进后的图版预测低渗透油藏的含水率是行之有效的，对评价低渗透油藏的开发水平具有重要的指导意义。

Improvement of Tong's Chart and application in forecasting water cut of reservoir

Based on the research on the relation between the water cut and the recovery percentage of OOIP in low permeability reservoir, this paper adopts the statistical method and changes the constant 7.5 according to the statistics from the mid-high permeability reservoir into the constant 21.87 according to the statistics from the low permeability reservoir of Liaohe Oilfield in Tong＇standard formula through the improvement on Tong＇s Relation Chart between water cut and the recovery percentage of OOIP. The chart will be accordant with the law of water cut and recovery percentage in low permeability reservoir. The results show that the improved chart is effective on forecasting the water cut of the low permeability reservoir, which will be a guide in the evaluation of development level of low permeability reservoir.