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在野外观测中,我们发现,利用多极声波测井仪(Chen,1984)可以在下套管并孔中有效地测量地层中的 P 波和 S 波.由一个单极和一个四极的激发源/接收器系统构成的多极测井仪,最初设计用于在裸井中直接测定各种岩石的 P 波与 S 波.与工作频率为15至25千赫兹的常规声波测井仪相比,其单极激发/接收系统的(P 波)工作频率为7至10千赫兹,而四极激发/接收系统(S 波)的工作频率为3至7千赫兹.这种低操作频率产生信息比常规声波测井仪器产生的信息能更有效地穿透井中套管和混凝土,人而用多极声波测井仪记录的 P 波和 S 波通常比穿过套管和混凝土的干扰波要强得多.因此可以容易地识辨这些地层的波至,并与套管波分离开来。我们在文章中给出几个从非常坚硬到非常软的地层的不同类型岩性的实例某些例子里还提供了下套管前后的比较结果.这些结果表明,即使是在那种经剧烈洗刷过的区段,结果也相当一致。
In field observations, we found that P-wave and S-wave in the formation can be effectively measured in the casing and hole using a multi-polar sonic logging tool (Chen 1984), consisting of a monopole and a quadrupole excitation source / Receiver system originally designed for the direct measurement of P and S waves of various rocks in bare bores.Compared with conventional acoustic logging tools operating at 15 to 25 kHz, The (P-wave) operating frequency of a monopolar excitation / reception system is 7 to 10 kHz, while the quadrupole excitation / reception system (S-wave) operates at a frequency of 3 to 7 kHz. This low operating frequency produces information Sonic logging tools produce information that penetrates wellbores and concrete more efficiently, and P-waves and S-waves recorded by multi-polar sonic logging tools are generally much stronger than those that travel through casing and concrete. It is therefore easy to identify the arrival of these formations and separate them from the casing wave. We have given several examples of different types of lithology from very hard to very soft formations in the article Some examples provide comparative results before and after the casing.These results show that even in the case of the kind of intense scrub Over the section, the result is quite consistent.