皮克特图版在含泥质砂岩储层测井解释评价中的改进及应用

Improvement and Application of Pickett Plot for Well Logging Interpretation of Argillaceous Formation

经典皮克特图版由阿尔奇公式推导而来,但无法处理泥质砂岩储层。本文以南海西部海域W油田作为研究对象,从印度尼西亚公式出发,对经典皮克特图版进行改进,开发出了泥质砂岩皮克特图版。通过对比分析经典皮克特图版与泥质砂岩皮克特图版的不同,指出在含泥质砂岩储层测井解释评价中使用泥质砂岩皮克特图版的重要性,并提出利用迭代法精确求解地层水电阻率及岩电参数的方法。研究表明:使用改进的泥质砂岩皮克特图版计算得到的地层水电阻率与纯水层的计算结果保持一致;同时,相比于经验值,使用迭代法求解出的地层水电阻率及岩电参数与实际情况更为吻合。

The regular Pickett plot is derived from Archie formula, which is not suitable for the evaluation of argillaceous formation in the west of the South China Sea. The authors modified the regular Pickett plot based on the Indonesian formula, developed a new Pickett plot for argillaceous formations, and proposed a method for calculating water resistivity and geoelectric parameters accurately by iteration. The study shows that the formation water resistivity calculated by the improved Pickett plot of argillaceous sandstone is consistent with that calculated by pure water layer. In comparison with the empirical value, water resistivity and geoelectric parameters obtained by the iterative method are more consistent with the actual situation.