大地电磁走向角确定及其对MT响应函数的影响  

Determination of the magnetotelluric strike and its influence to MT response function

作　　者：秦林江[1] 杨长福[1] 肖思东[1] 

机构地区：[1]浙江大学地球科学系,浙江杭州310027

出　　处：《石油地球物理勘探》2010年第A01期217-223,共7页Oil Geophysical Prospecting

基　　金：国家自然科学基金面上项目(40774035);浙江省教育厅科研项目(20061307)

摘　　要：本文基于目前大地电磁测深勘探中确定MT走向的几种常用方法,以实测EDI格式的功率谱文件计算出走向角,分析和讨论不同方法所确定的走向角差异;通过实例计算,定量地反映走向角对计算视电阻率、相位等其他MT响应函数的影响程度。结果表明,在一般情况下,走向角对视电阻率、相位等MT响应函数有较大影响;当确定的走向角在某一范围时,不同方法获得的走向角对视电阻率、相位等影响较小。Based on the introduction to several widely-used methods for determining the magnetotelluric strike in the magnetotelluric depth probing exploration,the power spectrum file of the field measured EDI was used to calculate the strike,then the strike difference determined by different methods were analyzed and discussed,through filed example calculation,the influence extent of the strike on calculating apparent resistivity,phase and other MT response function were quantitatively reflected,the results show that the strike generally has obvious influence on apparent resistivity,phase and other MT response function.When the strikes lie in certain range,the strikes acquired by different methods have relatively small influence on apparent resistivity,phase and so on.

关 键 词：大地电磁 走向角 阻抗张量 倾子 

分 类 号：P631.325[天文地球—地质矿产勘探]