TEM对于深部低阻层的分辨能力模拟分析  

Resolution capability priliminary analysis of deep conductive layer with TEM method

作　　者：武军杰[1,2] 杨毅[2] 张杰[2] 王兴春[2] 邓晓红[2] 吕国印[2] 

机构地区：[1]长安大学地质工程与测绘工程学院,西安710054 [2]中国地质科学院地球物理地球化学勘查研究所,廊坊06500

出　　处：《物探化探计算技术》2014年第5期547-554,共8页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：公益性行业科研专项(200911017);老矿山深部和外围找矿(12120113085800);物化探研究所中央级公益性科研院所基本科研业务费专项资金(AS2012P03)

摘　　要：为正确认识瞬变电磁法对于深部低阻层的分辨能力,通过设计三层H型系列模型,分析不同参数条件下模型一维反演计算结果误差情况,初步总结了TEM(瞬变电磁法)方法对于低阻层的可靠分辨及不可分辨的条件。计算结果表明,在一维条件下,低阻层与围岩电阻率差异足够大,具有一定厚度的低阻层才能够被可靠分辨出来。厚度埋深比小于10%的低阻层不能可靠分辨出来,当低阻层厚度埋深比小于5%并且电阻率差异小于2倍的情况下,低阻层是不可分辨的;当低阻层埋深超过700m,厚度埋深比小于10%的低阻层也是不可分辨的。本次研究中给出了可靠分辨与不可分辨的临界参数条件,对于野外实测数据的反演结果的认识具有实际指导意义。In order to find out the resolution capability of depth conductive layer for TEM method,series of three-layer H style model was designed,and effect of which 1D inversion was analyzed in the condition of vary model parameters.The param-eters have been concluded on which condition the conductive layer can be recognized or can't be recognized.The calculation re-sult shows that only the conductive layer with enough difference with country layer and with enough thickness can be recognized in 1D inversion result reliably.The critical parameters to separate the reliable resolution and unreliable resolution out are of-fered,which may has practical significance of the awareness of field measurement data inversion results.

关 键 词：瞬变电磁 一维反演 深部 分辨力 

分 类 号：P631.325[天文地球—地质矿产勘探]