The Improvement Of Euler Deconvolution Method Of Magnetic Anomaly And Its Application In Mining Area Of Dapai In Yongding County In Fujian Province

Euler deconvolution method is a kind of potential field inversion method that is widely used to estimate the distribution of magnetic field source in magnetic prospecting. In recent years, this method is widely used and achieved good results.This method can estimate the position of the field source automatically or semi-automatically. Under the condition of less prior information rapidly, The accuracy of the initial selection of the geological model is not high, can quickly and effectively reflect the location of the source of the underground source, the boundary,depth, applicable to the source of the body of the magnetic properties of the parameters, Large area of the magnetic data of the grid is calculated and interpreted.However, after years of interpretation, the application shows that the method is also affected by manual selection. It shows that if the choices of the window size and the structural index are not right, the estimation results are easy to diverge. Thus, a fixed window and a structural index are taken for different geological bodies in the large area, and the inversion results are not accurate enough.To solve these problems, this paper is based on the research of the theory of the Euler deconvolution method. The expression of the TDX boundary recognition filter is the inverse trigonometric function of the total horizontal gradient and the vertical gradient. The expression of the Theta boundary recognition filter is the ratio function of the change of the magnetic anomaly level and the vertical change. I combined TDX and Theta's two boundary recognition functions with Euler deconvolution methods,respectively. Transformed the Euler linear equations, and the new equations with TDX derivative and Theta derivative as coefficients are proved and established respectively.The tectonic indices in the conventional Euler equations are eliminated, and the least squares method is used to improve the Euler equations. Euler's inversion equation is solved to achieve the purpose of field anomaly inversion. In the practical application,it shows that the two improved Euler inversion methods can invert the boundary and depth of the geological body without the need of structural index.This paper uses four magnetic anomaly models to verify the effectiveness of these two methods. Each model is divided into three conditions: non-noise, the addition of noise and oblique magnetization. The inversion results of two inversion methods show that the position parameters of the anti-performance model can be obtained in the face of any model.In this paper, the practical application of the measured aeromagnetic data in Yongding county in Fujian province is carried out. This paper collected regional geophysical survey data in Yongding county, and analyzed the characteristics of regional magnetic anomaly distribution by using TDX method and Theta method.Then based on the inversion results, the paper inferred the fracture.