2 results about "Magnetotellurics" patented technology

This invention provides a numerical simulation method for magnetotellurics under the Lorentz specification. The Maxwell equations are transformed into a set of governing equations consisting only of vector potentials using the Lorentz specification. A two-dimensional Fourier transform is performed on the quadratic vector potential governing equations in the horizontal direction, converting the three-dimensional governing equations into one-dimensional governing equations, reducing computational load and storage requirements, and improving computational efficiency. The Fourier transform can employ the standard Fourier transform algorithm, the offset sampling Fourier transform algorithm, or the non-uniform sampling Fourier transform algorithm. Then, the one-dimensional equations are solved using the one-dimensional finite element method with quadratic interpolation shape functions, resulting in three pentagonal equation sets, which are then solved using the pursuit method. This invention offers fast computation speed and small memory footprint, providing a new method for efficient and high-precision numerical simulation of large-scale magnetotellurics.

The present invention patent discloses a method for high-order finite element forward modeling of magnetotellurics based on hybrid grids, which specifically relates to the field of geophysical electromagnetic three-dimensional forward modeling. The Delaunay triangulation algorithm is used to divide the earth's surface into triangular grids, and triangular grids are extended on the triangular grids to form triangular prism units; the areas adjacent to the triangular prism units are discretized into tetrahedral units, and the underground electrical model is discretized using the constructed hybrid grid. Finite element unit analysis is performed through high-order shape functions to discretize the magnetotelluric wave equations and form a magnetotelluric high-order finite element system; the hybrid grid finite element system is solved to obtain the magnetotelluric response signal. The technical solution of the present invention solves the problem of increased computational cost caused by the use of traditional unstructured networks in MT forward modeling under high-frequency conditions. The hybrid grid can adapt to complex geoelectric models with strong terrain fluctuations, which requires less computational cost than the use of traditional unstructured units.