电磁传播电阻率测井阵列仪探测特性的对比分析

On the Comparative Analysis of the Investigating Characteristics for the Array Electromagnetic Propagation Resistivity Logging Tools

MPR和VIKIZ是目前西方和俄罗斯应用最广泛的电磁传播电阻率测井阵列仪器。利用响应函数、信息丰度矩阵以及视电阻率曲线对MPR和VIKIZ的探测特性做了对比考察分析 ,发现VIKIZ的仪器参数选择比MPR的合理 ,应用效果更好。VIKIZ的各探头具有不同的探测深度 ,分布合理 ,其探头具有极高分辨率 ,它的测井曲线数虽然比MPR少了 3条 ,但其探测性能和视值解释效果却明显优于MPR ;VIKIZ只测相位差Δ ,不测幅度比S ;VIKIZ的仪器参数是根据等参数条件选取的 ,其 14MHz的高频率对地层介电常数的影响一般不能忽略。分析的结果可为阵列仪器的改进及其资料处理方法研究提供依据。

MPR and VIKIZ are the most popular array tools of the electromagnetic propagation resistivity logging in the west countries and Russia. Their detecting characteristics were analyzed through the respond function, information abundance matrix and the apparrent resistivity curves. It is found that the instrument parameters of VIKIZ are more appropriate than that of MPR and its application result is better. VIKIZ has five proper configurated detectors with higher resolution, each of them has its investigating depth;Though VIKIZ provides five log curves (3 less than MRR), its investigating properties and apparent interpretations are much better than that of MRR. VIKIZ only measures phase difference (Δ) not amplitude ratio(S);its parameters are selected according to equivalent parameters, the effect of higher frequency(14 MHz) on dielectric constants of formation should not be ignored. The results given in this paper are useful for the improvement of the array electromagnetic propagation resistivity logging tool and its data processing method.