一种动电探测器电极系的数值模拟研究

Numerical modelling study of an electrode array for electrokinetic detectors

用数值模拟方法研究了动电探测器在实际地层条件下的性能。首先分析了一种新型阵列式动电测井探测器电极系的设计依据及特点,建立了正演模拟模型,然后采用二维有限元法对动电探测器电极系的测井响应进行了数值模拟研究,并建立了在均质地层条件下点电极电场响应校验模型,分析了均质、高阻、低阻等地层以及不同层厚下的响应。分析结果表明,探测器对高阻地层及低阻地层的响应明显,能有效区分油层和水层。当层厚为1m时能有效划分油水界面;当层厚为0.5m时能非常准确地确定目的层中点的位置。此研究有助于指导动电探测器的设计、参数优化以及实际测井资料的处理。

The numerical modeling technique was applied to a study of the performance of an electrokinetic detector in different stratum environments. Firstly the design basis and characteristic of a new type of electrode array for electro- kinetic detectors for logging was analyzed, and a forward modeling model was established. Then, the logging respon- ses of the electrode array were simulated with the two-dimensional finite element method, and a model for verifica- tion of electrodes＇ electric field responses in the condition of homogeneous formation was founded. Finally, the dif- ferent logging responses in the strata of homogeneity, high resistance, low resistance, and the ones with different thicknesses, were analyzed so as to investigate the performance of electrokinetic detectors. The results show that the electrode array can effectively distinguish an oil layer from a water layer, the interface between the two layers can be rectors, optimizing parameters and processing real logging data.