阿尔奇公式在碎屑岩储集层中的应用

The application of Archie equation to the evaluation of clastic reservoirs.

岩电实验数据分析表明，阿尔奇公式中的地层电阻率因素都与孔隙度和渗透率呈负相关关系，把渗透率直接引入阿尔奇公式中求地层电阻率因素效果好；而影响含水饱和度指数的主要因素是孔隙度和渗透率的相关性，采用距离校正法可有效地改善地层电阻率指数和含水饱和度的关系，使含水饱和度的计算公式具有一定的稳定性，能把不同沉积环境、不同类型孔隙结构的储集层有效地统一起来。运用修正的阿尔奇公式有效地提高了含水饱和度的计算精度。图５参１（邹冬平摘）

Based on the great numbers of electric property experimental data, it is concluded that the formation resistivity factor F in Archie equation is a function of porosity ( Φ ) and permeability ( K ). The relation between m and log( K ) is, when K varies from high to low, the correlativity becomes from good to bad, when K little then 1.0, the correlativity becomes from negative to positive. The relation between m and Φ is to have positive correlation when Φ little then 16%, and to have reversal with poor correlation when Φ large then 16%. For formation resistivity index I, the main factor that affects n is the correlativity between Φ and K . It can greatly improve the correlativity between I and S w for different sedimentary environments by using distance correction. After introducing K to F and doing distance correction for I , it can effectively improve the S w precision and the computation stability of S w equation.