摘要
场源效应严重影响了可控源音频大地电磁法(CSAMT)的应用效果,为了分析场源效应的影响,利用三维积分方程数值模拟计算方法,模拟场源下方存在三维异常体模型,然后做了相关的野外试验。模拟和野外试验证明场源下方基岩深浅不同,受影响的是低频段,高频段几乎不受影响;低阻体产生的场源复印效应更强,也就是说观测数据受低阻体影响更大。
Source effects have serious impact on the application effect of CSAMT. In order to analyze the effect of the source effects, the authors used three-dimensional integral equation numerical simulation method to simulate 3D anomalous body below the source, and then made a field test. Simulations and field tests have proved that, due to the different depths of the bedrocks, only the low band is af-fected, whereas the high band is almost unaffected, and that the low resistivity body can generate stronger source overprint effects, so the observational data are more remarkably impacted by the low resistivity body.
出处
《物探与化探》
CAS
CSCD
2015年第1期132-135,共4页
Geophysical and Geochemical Exploration
基金
中国地质科学院物化探所基本科研专项资金项目(AS2008J01)
关键词
CSAMT
场源效应
积分方程法
三维数值模拟
低阻体
CSAMT
source effects
integral equation method
three-dimensional simulation
low resistivity body