时间域激发极化法在某多金属矿勘探中的研究与应用

Research and Application of Time Domain Induced Polarization Method in Exploration of A Polymetallic Deposit

某区成矿地质条件较好,但以往地质工作多限于地表,仅用了少量的土壤剖面和槽探工程进行解剖,查证力度有限,对深部矿化体研究不足。因此,开展物探工作查明含矿地质体的规模、产状特征十分必要。时间域激发极化法是以岩(矿)石、水的激发极化效应的差异为物性前提,研究地下横、纵向激发极化效应的变化,查明矿产资源和有关地质问题的方法。本文分析了激发极化法在某多金属矿勘探的视极化率与视电阻率特征,通过采用激电中梯装置,有效推断了研究区含矿地质体的平面范围和展布方向,通过采用激电测深装置,并采用带不平地形的2.5维广义逆反演,进一步查明了含矿地质体的顶底板埋深及赋存情况,为寻找隐伏矿体及深部工程施工提供了科学依据,取得了较好的找矿效果。

The metallogenic geological conditions of a certain area are good,but the previous geological work is mostly limited to the surface,only a small amount of soil profile and trenching engineering are used for dissection,the verification is limited,and the research on deep mineralized body is insufficient.Therefore,it is necessary to carry out geophysical exploration to find out the scale and occurrence characteristics of ore bearing geological bodies.The time domain induced polarization method is based on the difference of induced polarization effect between rock(ore)and water as the premise of physical property.It is a method to study the change of underground horizontal and vertical induced polarization effect and identify mineral resources and related geological problems.This paper analyzes the characteristics of apparent polarizability and apparent resistivity of induced polarization method in the exploration of a polymetallic deposit.By using IP middle ladder device,the plane range and distribution direction of ore bearing geological bodies in the study area are effectively inferred.By using IP sounding device and 2.5 D generalized inverse inversion with uneven terrain,the buried depth and occurrence of ore bearing geological bodies are further identified It provides a scientific basis for prospecting concealed ore bodies and deep engineering construction,and achieves good prospecting results.