类中梯装置的大功率三维激电法在甘肃花牛山金矿勘查中的应用  

Application of the Similar Central Gradient Array High-Power 3D Induced Polarization Method in the Huaniushan Gold Exploration of Gansu Province

作　　者：顾观文 王顺吉 武晔 许志河 GU Guanwen;WANG Shunji;WU Ye;XU Zhihe(School of Earth Sciences,Institute of Disaster Prevention,Langfang,Hebei 065201;Hebei Key Laboratory of Earthquake Dynamics,Langfang,Hebei 065201)

机构地区：[1]防灾科技学院地球科学学院,河北廊坊065201 [2]河北省地震动力学重点实验室,河北廊坊065201

出　　处：《地质与勘探》2023年第4期872-882,共11页Geology and Exploration

基　　金：中央高校创新团队项目(编号:ZY20215108);国家重大科学仪器设备开发专项(编号:2011YQ050060);河北省高等学校科学技术研究项目(编号:ZC2022056,ZC2021213);河北省硕士在读研究生创新能力培养项目(编号:CXZZSS2023184)联合资助。

摘　　要：时间域激发极化法是应用于金矿勘查的一种重要地球物理勘探手段,以往主要采用中梯扫面和激电测深组合的方法获取激电异常。中梯扫面受限于单一固定供电极距,仅能反映某一深度的激电异常分布;常规对称四极激电测深由于需要对固定测点布设不同极距的供电电极,工作效率较低,并且不适合三维探测。近些年随着大功率、阵列观测技术发展起来的类中梯激电装置可在观测区布设多组不同极距的供电电极,兼顾了激电测深与激电剖面二者的特点,为常年干旱的戈壁滩地区金属矿深部勘查提供了一种可能的探测手段。本文基于类中梯装置大功率三维激电测量技术在甘肃花牛山金矿区开展时间域激发极化法实验工作。实验结果表明:类中梯装置大功率三维激电观测能快捷高效获得研究区不同深度的激电异常;采用与类中梯装置相适应的三维反演方法对激电数据进行三维反演,可获取研究区地下三维精细电性结构;基于矿区的三维电性结构并结合相关地质资料构建的三维地质-地球物理模型,与矿区已知金矿点位置吻合,并发现了三处潜在成矿点。类中梯装置大功率三维激电测量技术在供电困难的戈壁滩地区金属矿勘查中应用效果明显。Time domain induced polarization method is an important geophysical exploration method applied to gold exploration.In the past,a combination of central gradient scanning and IP sounding was mainly used to obtain IP anomalies.The scanning surface of the central gradient scanning is limited by a single fixed supply pole distance and can only reflect the distribution of induced polarization anomalies at a certain depth.Conventional symmetrical quadrupole induced polarization sounding has low work efficiency and is not suitable for three⁃dimensional(3D)detection due to the need to lay power electrodes with different pole distances at fixed measuring points.In recent years,with the development of high-power and array observation technology,the similar central gradient array induced polarization device can deploy multiple sets of power supply electrodes with different pole distances in the observation area,taking into account the characteristics of both induced polarization sounding and induced polarization profile,which provides a possible detection method for deep exploration of metal mines in the perennial arid Gobi Desert area.This work is based on the highpower 3D induced polarization measurement technology of a similar central gradient array to carry out experimental work on the time domain induced polarization method in the Huaniushan gold mine area of Gansu Province.The experimental results show that the high-power 3D induced polarization observation of a similar central gradient array can quickly and efficiently obtain induced polarization anomalies at different depths in the research area.By using a 3D inversion method suitable for the similar central gradient array devices to perform 3D inversion on induced polarization data,the underground 3D fine electrical structure of the research area can be obtained.Based on the 3D electrical structures of the mining area and combined with relevant geological data,a 3D geological geophysical model was constructed,which is consistent with the known location of gold mi

关 键 词：三维地质-地球物理模型 类中梯装置 大功率 时间域激发极化法 花牛山金矿 甘肃 

分 类 号：P631.3[天文地球—地质矿产勘探]