earth resistivity Magazines & Journals

Explicit expressions for the Fréchet derivatives in 3D anisotropic resistivity inversion

We have developed explicit expressions for the Fréchet derivatives or sensitivity functions in resistivity imaging of a heterogeneous and fully anisotropic earth. The formulation involves the Green’s functions and their gradients, and it is developed from a formal perturbation analysis and by means of a numerical (finite-element) method. A ...

By ZZ Resistivity Imaging Pty. Ltd.
2.5-D/3-D resistivity modelling in anisotropic media using Gaussian quadrature grids

We present a new numerical scheme for 2.5-D/3-D direct current resistivity modelling in heterogeneous, anisotropic media. This method, named the ‘Gaussian quadrature grid’ (GQG) method, cooperatively combines the solution of the Variational Principle of the partial differential equation, Gaussian quadrature abscissae and local cardinal functions ...

By ZZ Resistivity Imaging Pty. Ltd.

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Explicit expressions for the Fréchet derivatives in 3D anisotropic resistivity inversion