Electromagnetic fields from a horizontal electrical dipole buried in ocean |
| |
| Authors: | JIA Dingyu WENG Aihua LIU Yunhe YIN Changchun |
| |
| Institution: | College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China |
| |
| Abstract: | Marine controlled source electromagnetic signal could be used in mineral resource exploration,reservoir appraisal and communicative technique in ocean. It’s necessary to study the electromagnetic generated by MCSEM. The propagation of the electromagnetic fields from a controlled source in the marine environment was studied with virtual interface method combined with discrete complex image method. Transmitter of finite length current source is approximated by dipole (HED) . A three-layered model is accepted,with sea water as intermediate conductive layer under air and a relatively high resistive seabed as basement,possibly containing a hydrogen layer of higher resistivity. The electromagnetic fields in whole space thus computed show that: (1) the spatial distribution of field component depends on its type; (2) inline Ex component is more sensitive to reservoir layer than that in broadside; (3) The airwave affects marine electromagnetic (MEM) exploration when sea water is relatively shallow; in the case of deep water MEM exploration,the airwave influence could be neglected; and (4) an appropriate frequency should be selected in order to balance the signal strength and electromagnetic induction effect. |
| |
| Keywords: | electromagnetic propagation 1D model horizontal electrical dipole marine electromagnetic method |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
