2.5D Electromagnetic Profiling Forward Modeling with Finite Difference Method
详细信息
- 责任者：Liu Fangdi (Key Laboratory of Earth Exploration and Information Techniques of the Ministry of Education ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Wang Xuben
- 刊名：Coal Geology & Exploration
- 出版年：2012
- 卷期：40(1)
- 关键词：电磁法勘探 ; electromagnetic prospecting
- 页码：p.79-84
- 图表：14 illus., 18 refs.
- 分类号：1600
- issnNo：ISSN1001-1986
- isbnNo：CN61-1155/P
摘要
A finite difference formulation is developed for computing the frequency domain electromagnetic fields due to a magnetic source in the presence of two-dimensional conductivity structures.The main principle of this forward modeling method is to synthesize data for three dimensional signal source with a series of different wave numbers in geologic structure’s strike direction(direction x in Cartesion coordinate system).By the Fourier trans-formation the problem is transformed into the x-wave number(kx) and two coupled partial differential equations for Hx(kx,y,z) and Ex(kx,y,z) are obtained.These equations can be solved by finite difference method in y-z plane.In the paper,four typical models are used for 2.5D forward modeling.Then we demonstrate the Hz curves for two-anomaly bodies in different depth,two-lean-anomaly bodies and down fault anomaly.Numerical modeling re-sults clearly show the magnetic anomaly of the anomalous characteristics.Finally,we simulated the inter well ex-ploration methods and obtained some good results in Ey and Hz.