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

[1] Constable S, Weiss C J. Mapping Thin Resistors and Hydrocarbons with Marine EM Methods:Insights from 1D Modeling[J]. Geophysics, 2006, 71(2):43-51.

[2] Eidesmo T, Ellingsrud S, MacGregor L M, et al. Sea Bed Logging (SBL):A New Method for Remote and Direct Identification of Hydrocarbon Filled Layers in Deepwater Areas[J]. First Break, 2002, 20(3):144-152.

[3] Ellingsrud S, Eidesmo T, Johansen S, et al. Remote Sensing of Hydrocarbon Layers by Sea Bed Logging-SBL:Results from a Cruise Offshore Angola[J]. The Leading Edge, 2002, 21(10):972-982.

[4] MacGregor L M, Thomkins M, Andreis D. Electromagnetic Surveying for Hydrocarbon Reservoirs:U K, 20050077902[P]. 2005-04-14.

[5] Um E S, Alumbaugh D L. On the Physics of the Marine Controlled-Source Electromagnetic Method[J]. Geophysics, 2007, 72(2):13-26.

[6] Chave A D, Constable S C, Edwards R N. Electrical Exploration Methods for the Seafloor[C]//Nabighian M N.Electromagnetic Methods in Applied Geophy-sics. Tulsa:Society of Exploration Geophysicists, 1991:931-966.

[7] Chen J, Alumbaugh D L. Three Methods for Mitigating Airwaves in Shallow Water Marine Controlled-Source Electromagnetic Data[J]. Geophysics, 2011, 76(2):89-99.

[8] Amundsen L, Løseth L, Mittet R, et al. Decomposition of Electromagnetic Fields into Up Going and Down Going Components[J].Geophysics, 2006, 71(5):211-223.

[9] Constable S. Ten Years of Marine CSEM for Hydrocarbon Exploration[J]. Geophysics, 2010, 75(5):7567-7581.

[10] Maaø F A, Nguyen A K. Enhanced Subsurface Response for Marine CSEM Surveying[J]. Geophysics, 2010, 75(3):7-10.

[11] Chave A D, Cox C S. Controlled Electromagnetic Sources for Measuring Electrical Conductivity Beneath the Oceans:1:Forward Problem and Model Study[J]. Journal of Geophysical Research, 1982, 87(B7):5327-5338.

[12] Wait J R. The Electromagnetic Fields of a Horizontal Dipole in the Presence of a Conducting Half-Space[J]. Canadian Journal of Physics, 1961, 39(7):1017-1027.

[13] Baàos A. Dipole Radiation in the Presence of a Conducting Half-Space[M]. Oxford:Pergamon Press Inc, 1966.

[14] Bannister P R. New Simplified Formulas for ELF Sub-surface-to-Subsurface Propagation[J]. IEEE Journal of Oceanic Engineering, 1984, 9(3):154-163.

[15] King R W P, Owens M, Wu T T. Lateral Electromagnetic Waves:Theory and Applications to Communications, Geophysical Exploration, and Remote Sensing[M]. Newyork:Springer-Verlag Inc, 1992.

[16] Løseth L O, Amundsen L, Jenssen A J K. A Solution to the Airwave-Removal Problem in Shallow-Water Marine EM[J]. Geophysics, 2010, 75(5):37-42.

[17] Ziolkowski A, Wright D. Removal of the Airwave in Shallow Marine Transient EM Data[C]//77th Annual International Meeting. San Antonio:Society of Exploration Geophysicists, 2007:534-538.

[18] Lu X, Srnka L J, Carazzone J J. Method for Removing Air Wave Effect from Offshore Frequency Domain Controlled-Source Electromagnetic Data:U S, O2005/010 560A1[P].2005-10-20.

[19] 殷长春, 刘云鹤, 翁爱华, 等, 海洋可控源电磁法空气波研究现状及展望[J]. 吉林大学学报:地球科学版, 2012, 42(5), 1506-1520. Yin Changchun, Liu Yunhe, Weng Aihua, et al. Research on Marine Controlled Source Electromagnetic Method Airwave[J]. Journal of Jilin University:Earth Science Edition, 2012, 42(5):1506-1520.

[20] 沈金松, 詹林森, 王鹏飞, 等.可控源海洋电磁勘探中空气波影响的理论分析和数值模拟[J]. 地球物理学报, 2012, 55(7):2473-2488. Shen Jinsong, Zhan Linsen, Wang Pengfei, et al. Theoretic Analysis and the Numerical Simulation of the Effects of the Air Wave Interaction on the Marine Controlled Source Electromagnetic Exploration[J]. Chinese Journal of Geophysics, 2012, 55(7):2473-2488.

[21] 刘长胜, 林君. 海底表面磁源瞬变响应建模及海水影响分析[J]. 地球物理学报, 2006, 49(6):1891-1898. Liu Changsheng, Lin Jun. Transient Electromagnetic Response Modeling of Magnetic Source on Seafloor and the Analysis of Seawater Effect[J]. Chinese Journal of Geophysics, 2006, 49(6):1891-1898.

[22] Nordskag J I, Amundsen L, Ursin B. Decomposition of Marine Electromagnetic Fields into TE and TM Modes for Enhanced Interpretation[C]//EGM International Workshop.[S.l]:EGM, 2007.

[23] Ward S H, Hohmann G W. Electromagnetic Theory for Geophysical Applications[C]//Ward H S, Hohmann W G. Electromagnetic Methods in Applied Geophysics.[S.l]:SEG, 1988:131-311.

[24] Weiss C J. The Fallacy of the Shallow-Water Problem in Marine CSEM Exploration[J]. Geophysics, 2007, 72(6):93-97.

[25] Løseth L O, Pedersen H M, Schaug-Pettersen T, et al. A Scaled Experiment for the Verification of the Seabed Logging Method[J]. Journal of Applied Geophysics, 2007, 64(3/4):47-55.

[26] Andréis D, MacGregor L. Controlled-Source Electromagnetic Sounding in Shallow Water:Principles and Applications[J]. Geophysics, 2008, 73(1):21-32.

[27] Ziolkowski A. Developments in the Transient Electromagnetic Method[J]. First Break, 2007, 25(6):99-106.

[28] Mittet R. Normalized Amplitude Ratios for Frequency-Domain CSEM in Very Shallow Water[J]. First Break, 2008, 26(11):47-54.

[29] Wapenaar K, Slob E, Snieder R. Seismic and Electromagnetic Controlled-Source Interferometry in Dissipative Media[J]. Geophysical Prospecting, 2008, 56(3):419-434.
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