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瞬变电磁测井信号易受外界噪声干扰,严重影响探测准确度。针对这一问题,以瞬变电磁理论为基础,通过对瞬变电磁信号特征进行研究分析,采用积分采样方法实现对瞬变电磁晚期信号的各测道进行检测,从强噪声信号中提取毫伏级信号。并在此基础上,实现对三分量探测信号的同步积分采样。实验结果表明,积分采样方法可以有效改善井下探测系统的信噪比,提高瞬变电磁测井性能。
Transient electromagnetic logging signal is susceptible to external noise, seriously affecting the detection accuracy. In response to this problem, based on the transient electromagnetic theory, through the analysis of the characteristics of transient electromagnetic signals, the integral sampling method is used to detect each channel of the transient electromagnetic late signal, and the millivolts Level signal. And on this basis, to achieve the three-component detection signal synchronization integral sampling. Experimental results show that the integral sampling method can effectively improve the SNR of downhole detection system and improve transient electromagnetic logging performance.