A Study on Finite Element Modeling and Anomaly Features of Complex Resistivity Method with Surface Topography
详细信息
- 责任者：Shang Xiao (Hebei Electric Power Design and Research Institute ; Shijiazhuang 050000 ; China) ; Li Yong
- 刊名：Computing Techniques for Geophysical and Geochemical Exploration
- 出版年：2013
- 卷期：35(1)
- 关键词：频率域激发极化法 ; frequency-domain IP methods
- 页码：p.1-9
- 图表：illus., 2 tables, 21 refs.
- 分类号：1600
- issnNo：ISSN1001-1749
- isbnNo：CN51-1242/P
摘要
This thesis,in order to understand the influence caused by the undulate topography on the data of the complex resistivity method,develops the 2.5-D finite-element forward modeling method of the complex resistivity method in conditions of the undulate topography.From the comparison between the result of numerical modeling and the analytical solution,this modeling method has made a satisfactory result in terms of the calculation precision;from the numerical simulation results of several common terrains,it shows that the undulate topography’s effect on the complex resistivity method has a fairly strong correlation to the gradient and distribution of topography.The greater the gradient is,the more fiercely the effect o{ terrain functions.For the 45° terrains of ridge,valley and brae,the abnormal real component o{ complex resistivity caused by them comes respectively to background values of 21.2 times and 3.9 times and 3.4 times;the abnormal imaginary component reaches respectively to background values of 2.3 times and 2.2 times and 2.1 times;and abnormal amplitude,respectively,21.2 times and 3.9 times and 3.4 times.However,phase gets extremely weak impact of topography.These has laid a foundation for the topographic correction and inversion algorithm of the complex resistivity method.
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