摘要
本文系统地研究了大地电磁测深（MT）资料中倾子多数的特征。研究结果表明：倾子异常主要反映了地电构造的水平非均匀性；倾子异常的幅值不仅与水平非均匀界面两边介质电导率的对比度有关．还与上覆层的电导率和厚度以及观测频率有关；利用倾于异常的频率特征．可以定量地解释出垂直断面的上覆层厚度。在倾子资料解释方法上，可采用图象处理中的模板相关匹配技术。以理想模型的响应为样板，对野外实测资料进行匹配．可以较准确地解释出垂直断面的位置和埋深以及电阻车的分布情况等。文中对一条测线的野外实测倾子资料进行了处理和解释，在没有参考任何其它地质信息的情况下，解释结果能很好地反映该测线的地质构造特征，分辨率和可信度均较常规解释方法要高。
The characteristics of tipper parameter in magnetotelluric data are analysed detailedly. Tipper anomaly mainly reflects the horizontal nonuniformity of geoelectric structure. Amplitude of tipper anomaly depends on not only the conductivity contrast between the media at two sides of horizontal nonuniform interface but also the thicknes and conductivity of the overburden along with the field frequency. The frequency characteristic of tipper anomaly can be employed to quantitatively interPret the thickness of overburden above vertical fatllt. In tipper data interDretation,the template matching technique for image processing can be used to ascertain vertical fault and resistivity distribution in real data. The tipper data from a field traverse have been processed and interpreted without consultling any geological materlal. The interpreted results show good agreement with the known geologic knowledge,and have higher resolution and better reliability than usual results.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1997年第2期202-213,共12页
Oil Geophysical Prospecting
基金
中国石油天然气总公司科技局资助
关键词
大地电磁测深
资料解释
倾子异常
电法勘探
magnetotelluric sounding,data interpretation,tipper anomaly,template, matching,resistivity
