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《Chinese Journal of Geophysics》 2012-04
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3D frequency-domain modeling of marine controlled source electromagnetic responses with topography using finite volume method

YANG Bo1,XU Yi-Xian1,2,HE Zhan-Xiang3,SUN Wei-Bin3 1 Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074,China 2 State Key Laboratory of Geological Processes and Mineral Resources,Wuhan 430074,China 3 BGP,CNPC,Hebei Zhuozhou 072751,China  
We present an algorithm for modeling the 3D frequency-domain marine controlled-source electromagnetic(CSEM) response by using the finite volume method.In this paper,the formulae of the discrete form of the governing equation have been deduced in details.Comparison of the discrete formulae of the finite volume method(FVM) with the finite difference method(FDM) shows that FVM is more accurate,while it is as efficient as FDM.The weighted mean conductivity of the seawater and the sediment,which is calculated by using two volumes divided by the interface as the weightings,are set to be the conductivities of the cells on the terrain interface.Our numerical modeling shows that the weighting processes of the terrain interface can improve the accuracy of the terrain effects of CSEM.An oil reservoir with bathymetry variation has been simulated by our code.The modeling result demonstrates that the electric field is influenced by the terrain,however,the magnetic field is insensitive to the bathymetry.
【Fund】: 国家大型油气田及煤层气开发专项课题(2008ZX05019-007)资助
【CateGory Index】: P631.325
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