Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (1): 282-292.doi: 10.13278/j.cnki.jjuese.201501302

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Methods of Air Wave Approximation and Decomposition for Marine Controlled Source Electromagnetic Measurements in Shallower Water Domain

Shen Jinsong1,2,3, Wang Xuan1, Wei Shuaishuai1, Li Man1   

  1. 1. Faculty of Geophysics and Informatics, China Petroleum University(Beijing), Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resource and Prospecting, Beijing 102249, China;
    3. CNPC Key Lab of Geophysical Exploration, Beijing 102249, China
  • Received:2014-04-06 Published:2015-01-26

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Abstract:

In marine controlled-source electromagnetic (MCSEM) exploration, the influence on the EM response of the airwave has been paid great attention by the industry and the air wave is one kind of EM signal from the horizontal electric dipole (HED) source that is reflected from or travels along the air-sea interface and return back to receivers. In shallow water domains, the airwave dominates over the effective signal from seabed sediments, and makes it very difficult to identify the hydrocarbon reservoirs. On the basis of the layer model, we have derived airwave expression of half space resistivity model by using the mode decomposition theory of the EM field and the air wave in the sea water layer is approximately expressed as a series of wave reverberations that travel down and backward between the sea surface and the seabed. According to the propagations of EM field near sources and receivers, we have obtained airwave expression of a finite water layer. In order to compare the effectiveness of the various air wave mitigation methods, we have adopted the decomposition method of EM fields into upgoing and downgoing components, and have acuired larger anomaly of several times than that of the raw EM field above the resistive formation, and indicated the favorable effect of airwave attenuation by using of wave separation. Finally, simulation results of electromagnetic responses from different background and reservoir models have been used to check the effectiveness and adaptability of the two air wave mitigation methods of wave reverberations approximation and wave field decomposition, numerical results show that for model of horizontal layers, the latter is more effective, however, the former is applicable to rugged sea floor formation and the latter only fits for horizontal layers.

Key words: shallower water domain, marine controlled-source electromagnetic exploration, wave reverberations approximation, air wave separation, air wave mitigation

CLC Number: 

  • P631.3

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