摘要
EH - 4电导率成像系统属于部分可控源与天然场源相结合的一种大地电磁测深系统。由接收与发射两部分组成。根据勘探目的 ,可选择高频配置 ( 10Hz～ 10 0kHz)或低频配置 ( 0 .1Hz～10 0 0Hz)。通过采集时间域两组相互正交的电磁场信号 (Ex ,Hy ,Ey ,Hx)经过频谱分析及运算 ,求得不同频率的电阻率、相位及相关度变化曲线。通过分析对比这些曲线 ,现场判别数据质量 ,同时对剖面测点的一维视电阻率连续反演结果进行EMAP二维连续剖面反演 ,图示电阻率断面灰度图 ,可即时对勘测结果进行初步解释。
The Stratagem TM EH-4 electrical conductivity image forming system is a magnetotelluric sounding system which combines partly controllable source and natural field source and consists of receiving device and emitter. Based on the exploration object, one can use high frequency allocation (10 Hz～100 kHz) or low frequency allocation (0.1 Hz～1 000 Hz). By collecting two sets of electromagnetic signals (E x, H y, E y, H x) in time domain which are perpendicular to each other and through spectral analysis and calculation, the variation curves of different frequencies, resistivities, phases and correlation degrees can be drawn. By analysing and comparing these curves, the on the spot judgement of data quality can be carried out, the EMAP two dimensional continuous profiling inversion can be conducted for continuous inversion result of one dimensional apparent resistivity of measuring points along the profile, and the gray level diagram of the resistivity section can be illustrated. As a result, preliminary interpretation of the exploration result may be made immediately.Three fields work examples are given in this paper.
出处
《物探与化探》
CAS
CSCD
1998年第6期458-464,共7页
Geophysical and Geochemical Exploration
关键词
电导率
成像系统
电法勘探
电磁测量系统
EH-4 electrical conductivity image forming system, brief description,application.
