大功率电法在河南省铝土矿老矿区勘查中的应用
2012-11-07节昌录
节昌录
【摘要】阐述了河南省西部沉积铝土矿地层基本沉积情况。铝土矿沉积地层及其围岩的地球物理特性,铝土矿层岩系具有中低阻低极化特征,赋矿岩系顶板——石炭系灰岩、底板——奥陶系灰岩具有明显高阻中极化特征。使得利用电阻系法勘探成为可能。探讨利用大功率电法勘查铝土矿的方法技术,介绍如何利用大功率电法的勘测成果推断铝土矿体方法。举例说明大功率电法的在找铝土矿效果。
【关键词】大功率电法;铝土矿勘探;物探找矿;电阻率法お
High efficiency electrical method in Henan Province bauxite old mining area investigation application
Jie Chang—lu
(Henan Province, Geophysical Engineering InvestigationZhengzhouHenan450053)
【Abstract】Elaborated west Henan Province to deposit the bauxite stratum basic deposition situation. Bauxite sedimentary formation and adjacent formation geophysics characteristic,The alumina ore bedseam rock series have the low resistivity low polarization characteristic. Bestows on the ore rock series roof—Carboniferous series calcareous rock, ledger wall—The Ordovician system calcareous rock has obviously high—resistance polarizes the characteristic. Causes is the law possibly explores into using the resistance. Discussion use high efficiency electrical method investigation bauxite method technology, Introduced how uses the high efficiency electrical method the survey achievement inference alumina ore body method. Explains with examples the high efficiency electrical method to look for the bauxite effect.
【Key words】High efficiency electrical method;The bauxite prospects;The thing is fished for looking for an ore;Resistivity lawお
1. 绪言
(1)多年来,铝土矿勘探都以钻探、浅井、探槽、坑探等直接性的勘探为主。随着多年的开采,埋藏较浅的矿体已经基本开采完毕,坑采区留下的采井,采空也到处都是,加上以往的开采中存在采富弃贫,乱采乱挖,而使矿区千疮百孔,这些不明的采空区给以后的开采勘探带来了非常大的麻烦。如何在老矿区内继续勘察,开采,让这些老矿区再为国民经济服务,是需要解决的一大难题。
(2)利用物探方法与钻探验证相结合,从理论上来讲成为可能。六七十年时老地质工作都曾在豫西地区开展过激电法、浅震、α径迹、磁法等物探测量方法来做铝土矿勘探试验。其结果指出,放射性测量、中低精度磁法、激电等物探测量方法均不适用。浅震测量方法效果较好,但其费用高,电阻率测量和对称四极剖面测量方法的效果也不错,但当矿体埋藏较深、上覆有高阻时,其无法法穿透高阻层的“屏蔽”作用。……
