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油田勘探开发后期,迫切需要对0.2m薄层和薄互层进行定量评价,常规双侧向的纵向分辨率为0.6~0.9m,难与其它高分辨率测井曲线匹配,为此采用二维有限元方法进行数值模拟,对电极系进行优化设计,并分析了仪器的探测深度、纵向分辨率、层厚影响以及井眼影响,计算了连续测量曲线,并对数字聚焦后得到的深浅侧向电位场合电流线分布进行了数值模拟.理论分析和现场试验均表明,优化的电极系的纵向分辨率能够达到0.2 m,深浅侧向的探测深度分别为1.15 m和0.38m,但是仪器受井眼影响大,必须进行合理的实时井眼校正.
In the late stage of oilfield exploration and development, it is urgently necessary to quantitatively evaluate 0.2m thin and thin interbed. The conventional longitudinal resolution in bilateral direction is 0.6-0.9m and it is difficult to match with other high-resolution logging curves. Therefore, two-dimensional The finite element method was used to simulate the electrode system. The electrode system was optimized. The depth of investigation, longitudinal resolution, influence of layer thickness and borehole influence were analyzed. The continuous measurement curve was calculated. The current distribution in the potential field is numerically simulated.The theoretical analysis and field tests show that the longitudinal resolution of the optimized electrode system can reach 0.2 m and the lateral and deep depths of detection are 1.15 m and 0.38 m, The impact is large and a reasonable real-time wellbore correction is necessary.