The Practical Improvement Of Forward And Inversion Technique On Aeromagnetic Gradient Data And Its Application

In this thesis the author deduces new sphere ? T and its gradients' forwardtheoretical expressions in which the total magnetized direction of sphere isdifferent from the direction of geomagnetic field, and first clearly points out thatin upper non-source semi-space, the analytic odd points, in which the value cannotbe calculated, exist in original cuboid ? T and its gradients' forward theoreticalexpressions. Through detail formula deduction, the author discusses the cause theanalytic odd points exist, and then deduces new cuboid ? T and its gradients'forward theoretical expressions without analytic odd points. By means of directlyaccessing technique of a column or a block of grid data, it is possible for us todo the calculation and inversion of total gradient amplitude and Euler deconvolutionof grid data with large quantity. The author first puts forward the idea of alongthe anomaly's trend continuously tracing a string of adjoining maximum points afterautomatically searching a maximum point, the linking lines of string of maximumpoints can show the horizontal sites of edge (or center) of magnetic or gravity bodiesand structures more directly and effectively. Through automatically detect anddetermine the location and range of maximum anomalies, select the areas which existpotential source and do the inversion of Euler deconvolution, we can avoid lots ofpseudo inversion results and obtain the valid inversion results with high qualityand stability. At the same time, the strings of potential resources obtaining fromcontinuously tracing inversion of Euler deconvolution can also show the relationof the location and buried depth of potential resources more directly and effectively.The improved survey system of aeromagnetic horizontal gradient has importantprogress in instruments and survey techniques, its survey effect is good in Zhoushangtest area. The practically improved software of total gradient amplitude and Eulerdeconvolution of grid data can afford a fast inversion reference for theinterpretation of survey material.