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• W1999822034 abstract "We present a fast approximate method for three-dimensional low frequency controlled source electro-magnetic modeling. We apply the method to a synthetic model in a typical marine controlled source electromagnetic scenario, where conductivity and permittivity are different from the known background medium. For 3D configurations, fast computational methods are relevant for both forward and inverse modelling studies. Since this problem involves a large number of unknowns, it has to be solved efficiently to obtain results in a timely manner, without compromising accuracy. For this reason, the Born approximation, extended Born approximation and iterative extended Born approximation are implemented and compared with the full solution of the conjugate gradient fast Fourier transformation method. These methods are based on an electric field domain integral equation formulation. It is shown here how well the iterative extended Born approximation method performs in terms of both accuracy and speed with different configurations and different source positions. The improved accuracy comes at virtually no additional computational cost. With the help of this method, it is now possible to perform sensitivity analysis using 3D modelling in a timely manner, which is vital for controlled source electromagnetic applications. For forward modeling the solution at the sea-bottom is of interest, because that is where the receivers are usually located. For inverse modeling, the accuracy of the solution in the target zone is important to obtain reasonably accurate conductivity values from the inversion using this approximate solution method. Our modelling studies show that the iterative extended Born approximation method is fast and accurate for both forward and inverse modelling. Sensitivity analysis as a function of the source position and different reservoir sizes validate the accuracy of the iterative extended Born approximation." @default.
• W1999822034 created "2016-06-24" @default.
• W1999822034 creator A5065454449 @default.
• W1999822034 creator A5071846150 @default.
• W1999822034 date "2010-03-01" @default.
• W1999822034 modified "2023-09-25" @default.
• W1999822034 title "Fast and accurate three-dimensional controlled source electromagnetic modelling" @default.
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• W1999822034 doi "https://doi.org/10.1111/j.1365-2478.2010.00876.x" @default.
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