金胜,
魏文博,
邓明
中国地质大学(北京)地球物理与信息技术学院, 北京 100083
基金项目: 国家自然科学基金（41874142）、地信平台科研创新基金和国家高技术研究发展计划（863计划）重大项目"深部矿产资源探测技术"第三课题（2014AA06A603）联合资助
详细信息
作者简介: 王猛, 男, 1984年生, 副教授, 主要从事地球物理仪器研发和教学.E-mail:wangmeng@cugb.edu.cn
中图分类号: P631 收稿日期:2018-07-05
修回日期:2019-01-02
上线日期:2019-10-05
The technique analysis and achievement of the high power borehole-ground electromagnetic synchronous transmitter system
WANG Meng,JIN Sheng,
WEI WenBo,
DENG Ming
School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China
MSC: P631
--> Received Date: 05 July 2018
Revised Date: 02 January 2019
Available Online: 05 October 2019
摘要
摘要:为了提高勘探深度和分辨率，对于地球物理传统可控源电磁法的人工激励场源而言，主要通过提高其发射功率和更换激发方位的途径来实现，但是单套的发射系统会因为功率的增加而变得笨重、复杂和可靠性降低，且不适用于金属矿复杂的探测环境.本文采用分布于勘探目标区周边多个方位的中功率同步发射系统来组合成一套大功率发射系统，该系统可以显著提高探测区接收信号的信噪比，有望克服传统可控源类方法的探测盲区和获取可靠性更高的异常体反演结果.每个单套发射系统由发电机、开关供电电源、发射电缆、发射电极、发射机及其外控同步激发控制器构成.利用此发射系统可以在地面或井下的多个位置布设多个人工激励场源，同时对异常体进行扫频激发，频率范围覆盖10 kHz~0.01 Hz，单套发射系统的最大发射功率为48 kW，发射电流大于60 A，同时，在地面、井道、巷道或已有的探测井中采集电磁场信号.通过对均匀半空间理论场值的叠加计算以及实际数据的对比研究发现，多方位场源同时激发能够提高目标区信噪比，并初步验证了其可行性.该方法对可控源电磁法系统提出了一种全新的研发方向，为金属矿勘探提供了一种新的探测手段.
关键词: 井-地电磁法/
同步发射技术/
发射系统/
金属矿勘查/
信噪比
Abstract:In order to improve the depth and resolution of exploration, it is a main way to increase the transmitting power and replace the excitation direction for traditional geophysical controlled source electromagnetic method of artificial source. However, a single set of transmitter system will only get heavy and complicated because of the increase in power, meanwhile, the reliability of the system is reduced and it is not suitable for the detection of metal complex environment. This article provides the power distribution in exploration target zone surrounding multiple azimuth synchronous transmitter system to combine into a set of high power transmitter system, the system can significantly improve the signal-to-noise ratio of the received signal detection area by using the theoretical calculation and field test results, which is expected to overcome the traditional reliability of controlled source methods and detection blind area and get higher abnormal body inversion results. Each single set of transmission system consists of generator, switching power supply, transmitting cable, transmitting electrode, transmitter and external control synchronous excitation controller. The transmitter system could use the multiple position and multiple artificial source on the ground or underground to sweep the abnormal body, covering 10 kHz to 0.01 Hz frequency range, a single set of 48 kW maximum transmitted power of the transmitter system, transmission current greater than 60 A, at the same time to collect the electromagnetic field signals on the ground, shaft and roadway or existing wells. Based on superposition calculation of theoretical field values of uniform half space and comparison of actual data, we found that multiple source transmission can improve the target zone signal-to-noise ratio at the same time. This preliminary result has verified its feasibility and provided a new detecting means of controlled source electromagnetic system in the metallic ore exploration.
Key words:Borehole-ground electromagnetic/
Synchronous transmitting technique/
Transmitter system/
Metal mine prospecting/
Signal-to-noise ratio
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http://www.geophy.cn/data/article/export-pdf?id=dqwlxb_15189
