井下瞬变电磁探测运动补偿方法

Motion compensation method of underground transient electromagnetic detection

受测井仪器运动速度影响,井下瞬变电磁探测会引入收发距失配误差。针对这一问题,本文提出了一种基于收发距校正矩阵的井下瞬变电磁探测系统的运动速度补偿方法。首先介绍了井下瞬变电磁探测信号模型,并分析了收发距对井下瞬变电磁响应的影响。在此基础上,推导了瞬变电磁响应在不同采样时刻的收发距校正系数,并建立了基于该校正系数的运动速度补偿模型。最后,利用该方法对现场实测数据进行补偿分析。结果表明,该方法能降低由于运动测量带来的收发距失配误差,有效提高反演解释的精度。

Influenced by the velocity of logging tool,the mismatch error of transmitting and receiving distance will be introduced in downhole transient electromagnetic detection.In order to solve this problem,this paper proposes a method of velocity compensation for underground transient electromagnetic detection system based on transceiver distance correction matrix.Firstly,the signal model of underground transient electromagnetic detection is introduced,and the influence of transceiver distance on transient electromagnetic response is analyzed.On this basis,the correction coefficient of the transient electromagnetic response at different sampling time is derived,and the motion velocity compensation model based on the correction coefficient is established.Finally,the method is used to compensate and analyze the field measured data.The results show that this method can reduce the mismatch error caused by the motion measurement and effectively improve the accuracy of inversion interpretation.