... with the radiusvector H (Figure 2). We introduce a horizontal plane P located at some depth underground (with the axis z directed downward). We also assume that the background conductivity of the earth is given as J#(H); the domain with anomalous conductivity is below plane P. Let us consider a semisphere, KL...

... Summary In this paper we propose a methodology to generate a 3D distribution of pseudo-chargeability from airborne time domain electromagnetic data. The processing flow is as follows: (a) Invert the TEM data to generate a background conductivity. This may involve omitting data...

... background conductivity We consider, first, the typical MEMRS survey consisting of a set of sea-bottom electrical and magnetic receivers and a fixed horizontal electric dipole transmitter located onshore. The transmitter generates a frequency domain EM field. The operating frequencies are usually selected...

... need to be considered. dc resistivity anomaly magnetic permeability spherical target electrical potential dipole magnetic source magnetic anomaly upstream oil & gas seg houston 2013 geophysics frequency background conductivity low frequency dipole source magnetic target...

... SUMMARY We present a new formulation of the hybrid method for threedimensional (3D) electromagnetic (EM) modeling in complex structures with inhomogeneous background conductivity (IBC). This method overcomes the standard limitation of the conventional IE method related to the use...

... inversion result upstream oil & gas magnetic field conductivity background conductivity conductivity structure oldenburg inversion mt data seg seg denver 2010 british columbia information reservoir characterization grid algorithm ztem data ubc-geophysical inversion facility...

... SUMMARY We present a multigrid integral equation (IE) method for threedimensional (3D) electromagnetic (EM) field computations in largescale models with inhomogeneous background conductivity (IBC). This method combines the advantages of the iterative IBC IE method and the multigrid quasi...

... integral equation method reservoir characterization conductivity application em field structural geology inhomogeneous background conductivity modeling bathymetric inhomogeneity inhomogeneous background upstream oil & gas inhomogeneity electric field bathymetry effect integral...

... and keep it un- changed during the inverse process. In this paper, we introduce a new method of the nonlinear MT inversion which takes into account the known variable background conductivity model. We demonstrate that this approach provides a natural way for fast but accurate Fréchet deriv- ative...

... Summary We present a new formulation of the integral equation (IE) method for models with variable background conductivity. This method overcomes the standard limitation of the conventional IE method related to the use of a horizontally layered background only. The new IE method still employs...

.... Practically, this can be very limiting when attempting to solve those 3-D inverse problems where the background model is known to be inhomogeneous. To overcome this problem, we have extended the IE method for 3-D EM modeling to include an inhomogeneous background conductivity distribution and applied...

... ABSTRACT No preview is available for this paper. finite-difference approach migration conductivity variable background conductivity cross-section zhdanov equation hohmann background conductivity upstream oil & gas inversion time domain electromagnetic migration apparent...

... Obviously, the background theoretical field compo- nents o, and o, depend on the con- ductivity distribution in the given geoelectri- cal model and, therefore, can be treated as a func- tional of the conductivity model: We would like to modify the background conductivity in such a way, that it will be equal...