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Stepped Inversion of 2D Magnetic Data

Author: ZhangFeiFei
Tutor: WangWanYin
School: Chang'an University
Course: Solid Geophysics
Keywords: Step-by-step inversion Morphological function Continuation Zero frequency Normal background Improved control random search Magnetic anomaly
CLC: P631.4
Type: Master's thesis
Year: 2009
Downloads: 95
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Abstract


The magnetic anomaly, step-by-step inversion method is based on the characteristic parameters of the field source variable step-by-step magnetic anomaly inversion order unchanged by a given field source parameters inversion of body cross-section ( 1) magnetic source geometry parameters , (2) of magnetization, (3) the direction of magnetization of the magnetic source . The advantage of this method is not dependent on the magnetization and the magnetization direction of the field source , the field source geometry in the case of arbitrary magnetization direction of the inversion , and then were obtained by fitting the magnetic anomaly total gradient magnetic anomaly value field source magnetization and the direction of magnetization. On the basis of previous studies ( Soraya , 2007) , step-by-step method inversion carried out a more detailed analysis . First, the data processing in the frequency domain , the upward continuation technique , a good solution to the problem of high frequency interference ; solve the zero frequency in the frequency domain magnetic anomaly component conversion process ; detailed study morphological the general characteristics of the function S by a constant increase in the forward value of the abnormal component solve regional background interference ( normal field ) in the form of the function S calculated ; Fourth, the objective function is modified by changing the form of function of magnitude and units to enhance the effect of the S-function , not only improve the inversion speed and improve the inversion accuracy ; Fifth improved inversion control field source morphology random search algorithm (ICRS) and the use of the Fortran90 standard preparation of the corresponding program , carried out a large number of model spreadsheet to get satisfactory results . Step inversion method for processing of aeromagnetic data in the northern part of the South China Sea , has been relatively consistent results with other methods .

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