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浅析提高深部高密度电法探测精度的方法

2018-08-30赵希正

价值工程 2018年20期

赵希正

摘要: 针对目前国内用于勘探的高密度电法仪器存在的供电缺限,提出重新设计高密度电法仪的供电系统、人工电流场稳定性智能检测系统及电压转换智能控制系统的解决方案。本方案可以实现在一个完整的测量排列中,根据勘探区地电条件只要设定好参数,整个排列断面的测量及供电电压的跳转将自动完成,无需人为干预。同时在整个排列测量断面上建立了稳定的供电电流场,增强了抗干扰能力,保证了勘探精度与勘探深度,使高密度电法勘探的工作效率得到了很大的提高。

Abstract: In view of the power supply shortage existing in high-density electrical instruments used for exploration in China, the solutions for redesigning power supply system for high-density electrical apparatus, intelligent detection system for artificial current field stability, and voltage conversion intelligent control system are proposed. This scheme can be realized in a complete measurement arrangement. According to the geoelectrical conditions in the exploration area, as long as the parameters are set, the measurement of the entire arrangement section and the jump of the power supply voltage will be automatically completed without human intervention. At the same time, a stable power supply current field has been established across the entire surveying section, which has enhanced the

anti-jamming ability, ensured the exploration accuracy and exploration depth, and greatly improved the working efficiency of high-density electrical surveying.

關键词: 高密度电法;人工电流场;视电阻率;干扰电平;信噪比

Key words: high-density electrical method;artificial current field;apparent resistivity;interference level;signal-to-noise ratio

中图分类号:P631.3 文献标识码:A 文章编号:1006-4311(2018)20-0276-04

0 引言

上世纪90年代初日本OYO公司和英国伯明翰大学最先研制出阵列电法勘探观测系统,使电法勘探象地震勘探一样使用覆盖式观测方式,可获取地下介质的地电信息,这种电阻率阵列勘探方法称高密度电阻率法。之后国外多家地质仪器公司开始研发此类先进设备。功能最突出的是德国DMT公司生产的RESECS高密度电法仪,该仪器将开关单元分布在各个电极上(解码器),其主机有一个电流测量通道和能够扩展为6个的电位测量通道,在单通道和多通道情况下均可最高控制960个电极。90年代末期我国自行研制的仪器开始使用于勘探领域。具有代表性仪器为重庆奔腾数控技术研究所生产的WDJD-3多功能数字直流激电仪与WDJD-3多路电极转换器,实现了直流电法的高密度测量功能。……

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