Analysis of Air Wave Interaction Mechanism and Effect of Sea Water Depth on Electromagnetic Prospecting
详细信息
- 责任者：Shen Jinsong (College of Geophysics and Information Engineering ; China University of Petroleum ; Beijing 102249 ; China) ; Zhan Linsen
- 刊名：Journal of China University of Petroleum
- 出版年：2011
- 卷期：35(6)
- 关键词：海洋物探 ; marine geophysical exploration ; 电磁场 ; electromagnetic field
- 页码：p.51-58
- 图表：7 illus., 22 refs.
- 分类号：0200
- 出版序号：20122170
- issnNo：ISSN1673-5005
- isbnNo：CN37-1441/TE
摘要
Based on the analysis of electromagnetic (EM) potential and electromagnetic field of 1D layer model, the interaction relationships of EM fields among air, sea water layer and undersea formation were established by using mode decomposition theory of EM field. Based on the presumed infinite sea water model and five-layer model, the EM field expressions of the TE and TM modes which were decomposed from the EM responses excited by the horizontal electric dipole (HED) source were derived. The variation laws of critical offset with the undersea floor conductivity and sea water depth. It is pointed out that the conventional recognition of former researchers of the boundary depth of 300 m between the deep sea water and shallow water has drawbacks.