Abstract
Three-dimensional magnetic inversion allows the distribution of magnetic parameters to be obtained, and it is an important tool for geological exploration and interpretation. However, because of the redundancy of the data obtained from large-scale investigations or high-density sampling, it is very computationally intensive to use these data for iterative inversion calculations. In this paper, we propose a method for compressing magnetic data by using an adaptive quadtree decomposition method, which divides the two-dimensional data region into four quadrants and progressively subdivides them by recursion until the data in each quadrant meets the regional consistency criterion. The method allows for dense sampling at the abnormal boundaries with large amplitude changes and sparse sampling at regions with small amplitude changes, and achieves the best approximation to the original data with the least amount of data, thus retaining more anomalous information while achieving the purpose of data compression. In addition, assigning values to the data in the quadrants using the averaging method is essentially equivalent to average filtering, which reduces the noise of the magnetic data. Testing the synthetic model and applying the method to mineral exploration a prove that it can effectively compress the magnetic data and greatly improve the computational efficiency.
Highlights
The magnetic survey is widely used in geological mapping, geological structure surveys, mineral resources exploration, sedimentary basin basement detection and other fields [1]
A total of 10 medium and high magnetization anomalies were obtained by 3D inversion, and were labeled M1-M10
The distribution of anomalies corresponds to the surface magnetic anomalies, and their buried depth is between 100 m and 500 m
Summary
The magnetic survey is widely used in geological mapping, geological structure surveys, mineral resources exploration, sedimentary basin basement detection and other fields [1]. According to the different inversion algorithms, magnetic inversion can be summarized into two categories [2], one is to obtain the equivalent magnetism through inversion calculations to outline the distribution of magnetic anomaly field sources, called the probability tomography [3,4,5] This is a semi-quantitative inversion interpretation method that is simple, stable, and fast to compute. It can be used to locate the geometric position of the anomaly and solve complex geological problems Another type of inversion method is to directly calculate the magnetic distribution in the imaging space through linear or nonlinear algorithms to obtain information about the shape, volume, magnetic parameter distribution and properties of anomalies
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