物探化探计算技术2012，Vol.34Issue(6)：646-651,6.DOI:10.3969/j.issn.1001-1749.2012.06.04
瞬变电磁法对低阻薄层的分辨能力研究
STUDY ON TEM'S RESOLUTION CAPABILITY FOR THE THIN LAYER OF LOW RESISTIVITY
摘要
Abstract
Starting from frequency-domain electric field excited by vertical magnetic dipole, we derived one-dimensional forward method of Loop source, and calculated induced electromotive force on the thin layer of low resistivity while the ratio of depth and thickness and difference in the resistivity changes. In accordance with volume effect of e-lectromagnetic method, we improved traditional dichotomy and proposed the method of calculating the whole stage apparent resistibity. And then on this basis we draw the curves of apparent resistivity when the ratio of depth and thickness is 1 : 1. 2,1 = 1. 5, 1 : 2, 1 : 4 and the ratio of resistivity is 1 = 5, 1 : 10, 1 : 20 respectively. By comparing the characteristics of all kinds of apparent resistivity curve for different geoelectric models, we pointed out the resolution limit of TEM for low-resistivity thin layer of specific kinds and summarized the capacity of TEM for identifying and distinguishing low-resistivity thin layer, which is important to study the response of horizontal layered medium.关键词
瞬变电磁法/低阻薄层/改进二分法/全期视电阻率/分辨能力Key words
TEM/ thin layer of low resistivity/improved dichotomy/ whole stage apparent resistibity/ identified capacity分类
天文与地球科学引用本文复制引用
王战军,朱自强,李建慧,鲁光银,赵云威,彭凌星..瞬变电磁法对低阻薄层的分辨能力研究[J].物探化探计算技术,2012,34(6):646-651,6.基金项目
国家自然科学基金项目资助(41174061) （41174061）
湖南省自然科学基金项目资助(11JJ3042) （11JJ3042）
