电阻法测定多孔介质含水饱和度可行性研究

为了研究电阻法测定多孔介质中含水饱和度方法的可行性,设计了静态标定试验和二维动态物理模拟试验,对比根据含水饱和度变化计算的最终采收率和实际采收率是否相符。试验结果表明,矿化度由4000mg/L降低到1000mg/L时,静态电阻值上升幅度接近50%;电极间距对测量电阻值影响可以忽略不计;通过含水饱和度的变化计算出的最终采收率17.99%与实际采收率18.41%基本相符。因此,电阻法测定多孔介质含水饱和度方法性能稳定且一致性较好,对于油田的开发效果分析、潜力评价、水淹层测井解释方法的验证等诸多方面起着良好的指导作用。

The Feasibility of Determining Water Saturation in Porous Media by Using Electrical Resistivity

To study the feasibility of determining water saturation in porous media by using electrical resistivity method,static calibration experiments and 2-D dynamic physical simulation experiments were established,it compared the calculation of oil production by the water saturation with the actual oil recovery.The results show that when the salinity was reduced from the 4000mg/L to 1000mg/L,the static resistance values were reduced by nearly 50%,and the distance between electrodes on the measurement of resistance was negligible.The ultimate recovery calculated by using the water saturation changes of the different permeability distributions is 17.99%,it is consistent with the actual oil recovery of 18.41%.Therefore,water saturation in porous media determined with the electrical resistivity method presents stability and consistency.It provides a guidance for the evaluation of oilfield development effect,its potential analysis and the proving the logging interpretation of water-out reservoirs.