A multi-layer equivalent source up-and-down continuation method for magnetic data

Abstract

The present invention provides a method for upward continuation and downward continuation of multi-layer equivalent sources of magnetic measurement data, comprising: S1, inputting magnetic field data, and establishing a terrain relief surface according to the terrain height information of the area where the relief observation surface is located; S2, determining the network grid subdivision, and carry out continuous structured non-uniform grid subdivision to further determine the solution space of the inversion model; The three-dimensional inversion calculation of the integral equation with depth regularization factor, positive constraint term and regularization term is performed on the magnetic field data, and the multi-layer equivalent source model of the magnetic anomaly is obtained; S4. Using the multi-layer equivalent source model to conduct The forward calculation of the magnetic field can obtain the magnetic field data after the upward continuation and / or downward continuation produced by the magnetic anomaly. The beneficial effect of the present invention is that it can self-adapt to magnetic anomalies and quickly, efficiently and accurately generate required up-extension or down-extension data.

Description

technical field [0001] The invention relates to the technical field of geomagnetic surveying, in particular to a method for upward continuation and downward continuation of multi-layer equivalent sources of magnetic survey data. Background technique [0002] When geophysical magnetic methods (such as aeromagnetic survey and ground magnetic survey) are used for detection, the measurements are distributed on the surface of the undulating observation surface. Since the distance between the measurement position and the magnetic anomalous body is different, the main anomaly information reflected by the magnetic survey data also varies. difference. In practical applications, it is necessary to convert the measurement position of the data to meet the interpretation requirements of magnetic data processing. That is to extend the data on the observation surface to a higher observation surface to eliminate the influence of anomalous bodies closer to the observation surface on the mag...

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Problems solved by technology

[0005] However, these techniques have the following problems: 1) The number of equivalent source layers constructed by the above method is less than or equal to three layers, and the grid division is discontinuous; 2) The depth position of each equivalent source needs to be estimated separately, and then Placement; 3) The traditional continuation method has limitations on the continuation distance of data (generally less than 6 times the data point distance), and the calculation accuracy of continuation greater than the limit distance is poor

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