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Large-Scale Electromagnetic Modeling for Multiple Inhomogeneous Domains

Communications in Computational Physics 2009年第7期6卷 269-289页

作者： Masashi Endo Martin Cuma Michael S.Zhdanov Department of Geology and Geophysics University of Utah135S 1460ERm 719Salt Lake CityUT 84112USA

We develop a new formulation of the integral equation(IE)method for three-dimensional(3D)electromagnetic(EM)field computation in large-scale models with multiple inhomogeneous *** problem arises in many practical applications including modeling the EM fields within the complex geoelectrical structures in geophysical *** geophysical applications,it is difficult to describe an earth structure using the horizontally layered background conductivity model,which is required for the efficient implementation of the conventional IE *** a result,a large domain of interest with anomalous conductivity distribution needs to be discretized,which complicates the *** new method allows us to consider multiple inhomogeneous domains,where the conductivity distribution is different from that of the background,and to use independent discretizations for different *** reduces dramatically the computational resources required for largescale *** addition,using this method,we can analyze the response of each domain separately without an inappropriate use of the superposition principle for the EM field *** method was carefully tested for the modeling the marine controlled-source electromagnetic(MCSEM)fields for complex geoelectric structures with multiple inhomogeneous domains,such as a seafloor with the rough bathymetry,salt domes,and *** have also used this technique to investigate the return induction effects from regional geoelectrical structures,e.g.,seafloor bathymetry and salt domes,which can distort the EM response from the geophysical exploration target.

关键词： Large-scale EM modeling multiple inhomogeneous domains marine CSEM

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Frequency-dependent seismic anisotropy and its implication for estimating fracture size in low porosity reservoirs

Frequency-dependent seismic anisotropy and its implication f...

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中国科学院地质与地球物理研究所2003学术年会

作者： SONJA MAULTZSCH MARK CHAPMAN JOHN H.QUEEN Edinburgh Anisotropy Project EdinburghU.K. ConocoPhillips HoustonTexasU.S

The use of seismic anisotropy for characterizing subsurface fracture orientations and intensity has become increasingly ***,the reluctance of reservoir engineers to accept seismic anisotropy as a routine technique for fracture characterization is partly because of its inability to provide information about sizes and volume of *** both grain-scale micro-cracks and formation -scale macro-fractures are considered causes of *** anisotropy, reservoir engineers are more interested in the latter as permeability in many

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