Three Dimensional Interface Of The Gravity And Magnetic Modeling And Inversion Methods Research And Software Design

The inversion on geological interface of the gravity and magnetic seems to beone of the important problems in geophysical prospecting. It is of great significanceon improving the result of geological interpretation of the gravity and magnetic data.There are many methods of inversion on interface. It can be divided into the followingtwo domains: frequency domain and spatial domain, it also can be divided into twomethods, such as iterative method and direct method. Nowadays, the parker-method iswidely used for it having introduced FFT. This method not only has fast computationin frequency domain, but also has exact computation in spatial domain. It can inversethe relief depth of the interface automatically after giving the certain densitydifference and the average depth of the interface. However, there are also someproblems with parker-method, and the key problem with it is stability. In this paper,the parker-method is used in forward and inversion. On the basis of forefather'sresearches, I use a method enhancing the stability of inversion for rapid forward andinversion. On the other hand, two kinds of transcendental information are neededwhile using parker-method, such as density difference and average depth of theinterface. This paper makes use of the normalized full gradient method in inversion,and then obtains the two kinds of transcendental information while unknowing theaverage depth of the interface. In the aspect of inversion of multilayer, aftercomparison between many methods, I ultimately choose the layer-stripped inversionmethod for its reliability. First of all, the relief of the first layer must be known, andthen the field value of the first field interface is gained by forward calculation.Moreover, the total field value should be subtracted by the field value of the first layer,and finally do inverse calculation of the next interface.As the computer science fast developed, the computing speed advances rapidly,and the data size also gets a huge augment. Therefore, it is not only feasible but alsonecessary to introduce object oriented idea based on Windows developing platforminto visual system of inversion on gravity and magnetic interface. It can make the bestuse of resources of the user's computer adequately, and process gravity and magneticdata with large area and high density. The friendly GUI provided by the system alsomakes it easily to be used. Based on Windows developing platform, this paper usesthe language of Visual C++ and OpenGL, and develops a system of strong practicalitywith high speed and efficiency as well as precision.