Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (6): 1872-1880.doi: 10.13278/j.cnki.jjuese.20200195

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

Wang Xuan1, Shen Jinsong1, Wang Zhigang2, Sun Weibin2   

  1. 1. College of Geophysics, China University of Petroleum, Beijing 102249, China;
    2. Bureau of Geophysical Prospecting INC., China National Petroleum Corporation, Zhuozhou 072750, Hebei, China
  • Received:2020-08-29 Online:2021-11-26 Published:2021-11-24
  • Supported by:
    Supported by the National Natural Science Foundation of China (41574124) and Technology Project of China National Petroleum Corporation (2017D-3505)

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Abstract: 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.

Key words: marine controlled-source electromagnetics, preprocessing, signal correction, synthetic aperture

CLC Number: 

  • P631
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