A Three-Dimensional Polarizability Inversion Method Based on Cross-Gradient Constraints

CN122307749APending Publication Date: 2026-06-30SHAANXI GEOLOGICAL MINERAL & GEOCHEMICAL EXPLORATION TEAM CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHAANXI GEOLOGICAL MINERAL & GEOCHEMICAL EXPLORATION TEAM CO LTD
Filing Date
2026-03-13
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In areas with complex terrain, traditional mineral resource exploration methods suffer from distortion of underground currents due to topographic effects, leading to false anomalies. Furthermore, single-property parameter inversion methods have multiple solutions, making it difficult to accurately delineate the location and morphology of deep ore bodies.

Method used

A three-dimensional inversion method based on cross-gradient constraints is adopted. By combining hybrid grid partitioning, cross-gradient constraint terms and alternating inversion strategies with the joint inversion of resistivity and polarizability, a joint inversion objective function is constructed. The hybrid grid model and cross-gradient function are used to constrain parameters, eliminate the influence of terrain and improve the reliability of the inversion results.

Benefits of technology

It effectively eliminates the influence of terrain, reduces inversion errors, reduces multiple solutions, improves the clarity and reliability of ore body anomaly targets, and achieves efficient and stable identification of deep ore bodies.

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Abstract

This invention relates to the field of geophysical exploration technology and discloses a three-dimensional polarizability inversion method based on cross-gradient constraints. The method includes the following steps: acquiring apparent resistivity observation data d_obsr and equivalent apparent resistivity observation data d_obsη; performing hybrid mesh partitioning on the computational domain to generate a hybrid mesh model containing triangular prism elements, tetrahedral elements, and pyramidal elements; and performing three-dimensional resistivity forward modeling based on the hybrid mesh model to obtain the total field potential. This three-dimensional polarizability inversion method based on cross-gradient constraints, by employing a hybrid mesh (combination of triangular prism, tetrahedral, and pyramidal elements) partitioning technique, can accurately fit undulating surfaces, fundamentally eliminating the terrain influence error caused by mesh simplification. Measured data show that the forward modeling response error at steep terrain measurement points can be reduced from 5.1% to 1.5% using traditional methods, effectively suppressing false anomalies and making the anomaly boundary more clearly delineated.
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