Removal of the airwave effect by main-part decomposition of the anomalous field of MCSEM data

Removal of the airwave effect by main-part decomposition of the anomalous field of MCSEM data
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MCSEM数据异常场主体分解消除电波效应

DOI:
10.1007/s11770-018-0653-1
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发表时间:
2018-01
期刊:
影响因子:
0.7
通讯作者:
王鹏飞
王鹏飞
中科院分区:
地球科学4区
文献类型:
--
作者:
王书明;底青云;王若;王雪梅;苏晓璐;王鹏飞

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短波效应对浅海可控源电磁勘探观测资料影响较大,掩盖了勘探目标产生的异常效应,影响了勘探后期资料解释的准确性。本文提出了一种基于Stratton-Chu积分变换的海洋可控源电磁法(MCSEM)数据异常场主体分离方法,以消除浅海中主导观测电磁响应的电波效应。这种从异常场中分离主要部分的方法是一种基于离散数据集的有限脉冲响应滤波器。理论分析证明,该方法稳定,能有效抑制噪声。数值试验表明,该方法能有效地消除空气-水界面和海水层产生的电磁观测信号中的电波效应。该技术适用于海床平坦或粗糙的海水模型。
The airwave effect greatly influences the observational data from controlledsource electromagnetic exploration in shallow seas, which obscures the abnormal effects generated by exploration targets and, hence, affects the accuracy of the late exploration data interpretation. In this study, we propose a method to separate the main part from the anomalous field of marine controlled-source electromagnetic method (MCSEM) data based on Stratton–Chu integral transforms to eliminate the airwave effect, which dominates observed electromagnetic (EM) response in shallow seawater. This method of separating the main part from the anomalous field is a type of finite impulse response filter based on a discrete data set. Theoretical analysis proved that the method is stable and able to effectively depress noise. A numerical test indicated that the method could successfully eliminate the airwave effect from the observed EM signals generated by an air–water interface and a seawater layer. This technique is applicable for seawater models with either flat or rough seabeds.
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