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PIERS Online
Vol. 4
No. 5
2008
pp: 576-580Removal of Sea Surface Related Wavefields from CSEM DataPeter M. van den Berg, Aria Abubakar, and Tarek M. Habashy doi:10.2529/PIERS071206125235 Downloads: 586 Abstract:For a controlled-source electromagnetic (CSEM) survey in a shallow water environment, the presence of the sea surface significantly hinders the interpretation of the measured data. The electromagnetic (EM) wavefields are disturbed by the sea surface. The removal of the sea-surface related wave phenomena from the data is an important step in order to robustly interpret the collected data. We propose a processing method by which the sea-surface related multiples would be removed, while a priori knowledge of the EM source wavelet becomes superfluous. The governing equations are obtained from an appropriate application of the EM reciprocity theorem that relates on one side the EM fields in the actual measurement configuration including the sea surface and on the other side the EM fields in a desired source configuration and in the absence of the sea surface, where the water layer is extended to infinity.References:1. Eidesmo, T., S. Ellingsrud, L. M. MacGregor, S. Constable, M. C. Sinha, S. Johansen, F. N. Kong, and H. Westerdahl, "Sea bed logging (SBL), a new method for remote and direct identification of hydrocarbon filled layers in deepwater areas," First Break, Vol. 20, No. 144, 152, 2002. 2. Rosten, T. and L. Amundsen, "Generalized electromagnetic seabed logging wavefield decomposition into U/D-going components," SEG Expanded Abstracts, Vol. 23, 600-603, 2004. 3. Fokkema, J. T. and P. M. van den Berg, Seismic Applications of Acoustic Reciprocity, Academic Press, London, 1993. 4. De Hoop, A. T., Handbook of Radiation and Scattering of Waves, Academic Pres, London, 1995. 5. Vaage, S. T., J. T. Fokkema, and P. M. van den Berg, "Method for seismic exploration utilizing motion sensor and pressure sensor data," United States Patent, No. 7123543, October 17, 2006. 6. Van den Berg, P. M., A. Abubakar, and T. M. Habashy, "Removal of sea-surface related wavefields in controlled source electromagnetic survey," United States Patent Application, No. 11/554857, October 31, 2006. 7. Slob, E. C., K. Wapenaar, and R. Snieder, "Interferomtery in dissipative media: Adressing the shallow sea problem for seabed logging applications," SEG Expanded Abstracts, Vol. 26, 559-563, 2007. |
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