Study On The Fast Inversion Of Magnetic Source Parameters Based On The Eigenvalues Of Magnetic Gradient Tensor

Magnetic exploration is one of the commonly used geophysical methods,which has the characteristics of economy,convenience and high efficiency.It is widely used in geological survey,energy prediction and mineral exploration.Data processing and interpretation is the core part of magnetic exploration and the field source location and parameter inversion are two effective means commonly used in data processing.Field source localization plays an important role in magnetic prospecting,which can provide a basis for fault structure identification,structural unit division and geological lithology mapping.Based on the theory of magnetic gradient tensor,this paper studies the eigenvalues of magnetic gradient tensor and directional analytical signals in depth,and proposes a field source position identification method that it is combining the eigenvalues of magnetic gradient tensor and directional analytical signals(A combination of the eigenvalue values and the direction analytic signals,EDAS).Model test shows that the new process method for gradient tensor invariant tensor I₁,horizontal tensor invariant,the sum of the squares of the vertical derivatives of the horizontal analytic signal,curvature tensor maximum normalization algorithm and eigenvalue equilibrium boundary recognition method,EDAS with magnetic source positioning with high precision,strong ability to recognize,noise sensitivity low and magnetized Angle is small,etc.In the application of the measured magnetic data in the north of Wulate middle Banner,Inner Mongolia,EDAS method can better display the magnetic anomaly information,which provides a basis for the study of the distribution and morphological characteristics of underground magnetic bodies in the study area.Rapid inversion of magnetic source parameters can obtain the information of field source parameters automatically and quickly,which is of great significance in magnetic anomaly interpretation.Since the intensity of the normalized magnetic source is less affected by the magnetization Angle,it can be written into the expression related to the position of the geological body and the structural index.Based on this,a fast inversion method of magnetic source parameters based on vertical difference of normalized magnetic source intensity is proposed in this paper according to the normalized magnetic source intensity relations at different heights.The experimental results show that the normalized vertical difference of magnetic source intensity can improve the anomaly identification ability and resolution,and the inversion algorithm can accurately obtain the depth information of the field source and the structure index through the anomaly minimum trap.In addition,different extension heights can be used flexibly to reduce the influence of noise,and the reliability of inversion results can be improved by comparing the calculation results at different heights.In northern region of Inner Mongolia banner magnetic anomaly processing results reveal that high magnetic diorite in the area,the depth of the inversion of basic it is 0,structure index,main points in the vicinity of 1,article of the central belt high magnetic anomaly that is concealed caused by the long dyke,the depth between 0?1 km,the main change between 1?3 index structure,shows that the concealed vein width change,and is not strictly a fine dyke.The magnetic source location method and parameter inversion method proposed in this paper are both less affected by the direction of magnetization,and can quickly and accurately give the location and geometric parameters of the magnetic source,which provides technical support for the study of the distribution characteristics of underground magnetic bodies.