海洋可控源电磁数据的畸变校正与合成孔径源信号增强方法

我国对海洋可控源电磁勘探方法的研究起步较晚，目前海洋采集数据的处理流程较为单一。在经典的数据处理流程中，仍缺乏针对由存储设备读写、船速和长线源源距变化等造成的畸变电磁响应的数据处理方法。本文针对存储设备运行造成的规则干扰提出一种基于功率谱分析的自动压制方法；对于船速和长线源源距变化的干扰建立了分时窗畸变校正流程；最后，结合合成孔径源技术进一步增强了有效信号的强度。实测数据处理结果表明，文中提出的畸变校正与信号增强方法，在提高电磁数据信噪比的同时，增强了来自海底地层的有效信号幅度。

Distortion Correction and Synthetic-Aperture-Source Signal Enhancement Method of Marine Controlled-Source Electromagnetic Data

Due to the late start of marine controlled-source electromagnetic (MCSEM) method in China,the current processing flow of marine EM data is relatively simple. In these classic data processing procedures, there is still a lack of processing methods for distorted EM data caused by reading and writing to storage device, ship speed, and long-line source moment changes. In this study, a spectrogram-based automatic suppression method was proposed for regular noise caused by storage device operation, the corresponding window-based distortion correction procedures were established for the interference of ship speed and long-line source moment changes, and finally, the synthetic aperture source technology was applied to further enhance the strength of the effective signal. The results of real field data processing indicate that by using these distortion correction and signal enhancement methods, the signal-to-noise ratio of EM data can be increased while enhancing the effective signal amplitude from the seafloor.