Automatic Extraction Method of Magnetic Structural Lattice in Low Latitude Area

Abstract

The invention provides a method for automatically extracting structural grids. The method includes the following steps: performing multi-directional edge detection based on the horizontal gradient of the slope derivative at multiple scales on the gridded magnetic or gravity anomaly data to obtain the edges of each scale respectively; Edge refinement; by assigning cutting depth, burial depth, and magnetic or density strength attributes to each edge point respectively, various types of structural framework diagrams of multiple scales can be obtained, and the structural framework diagrams of various scales of the same type can be obtained Various types of comprehensive structural framework diagrams are generated by superimposing the diagrams. According to the method of the invention, the identification and qualitative interpretation of the geological structure controlling the formation of the ore deposit can be realized, and the target area positioning of the metal ore deposit can be realized. The invention is especially suitable for automatic extraction of magnetic structure grids in low latitude regions.

Description

technical field [0001] The invention relates to a method for automatically extracting a magnetic structure frame in a low-latitude area, which is a technology for detecting geological structures based on magnetic anomaly data. More specifically, the present invention relates to the fields of image processing, geophysics, geology, mineral exploration, etc., and the method according to the present invention can be directly applied to the fields of mineral exploration and related geological surveys, etc. Background technique [0002] The aeromagnetic method has the advantages of high efficiency, economy, speed, and can cover many difficult-to-reach landscape areas, etc., and it plays an increasingly important role in the exploration and evaluation of metal deposits, especially the development of high-precision aeromagnetic measurement technology. The geological structure detection method that controls the formation of deposits based on data is of great significance in all stage...

AI Technical Summary

Problems solved by technology

[0004] However, due to the influence of small magnetic inclination and noise, it is difficult to obtain reliable perpendicular magnetization magnetic anomaly data by polarizing TMI anomalous data in low latitude (usually refers to magnetic inclination between ±20°) regions

Existing methods for automatic identification and extraction of magnetic structure information based on postpolarization TMI anomaly data, such as analytical signal method, Euler deconvolution method, phase symmetry method (Phase symmetry), multi-scale edge detection method of potential field, potential Field multi-directional multi-scale edge detection methods, etc., are not suitable for automatic identification of magnetic structure information in low-latitude regions

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