用于地质勘查中的双频激电法  

APPLICATION OF DUAL-FREQUENCY IP METHOD TO GEOLOGIC EXPLORATION

作　　者：姜义生[1] 

机构地区：[1]核工业北京地质研究院,北京100029

出　　处：《铀矿地质》2000年第4期243-246,250,共5页Uranium Geology

摘　　要：笔者近年来采用S 3B双频激电仪在 3个地区铀、金和地下水的地质勘查中获得了较好的效果。本文介绍了不同电极排列的测深方法以及采用双频激电仪在不同地质体上测量、获得的视幅频率Fa 和视电阻率 ρa 断面图的不同特征。其中 ,在铀钼矿体部位显示为中阻高激电特点 ;在碎裂蚀变型的金矿赋存部位反映为低阻高激电效应 ;在富水地段则为低阻负视幅频率特征。验证结果表明 ,铀钼矿体一般工业矿化的Fa 为 3% - 6 % ,富矿体Fa 大于 6 % ,最高可达 15% ;金矿品位在 5× 10 - 6 以上者 ,Fa 为 3% - 6 % ;含水层Fa 为负值 ,视电阻率低于 30Ω·m。Recently the dual frequency IP survey has been applied by the author to the geological exploration for prospecting for uranium, gold and ground water, and satisfactory results have been obtained. This paper introduces IP electro sounding with different arrangement of electrodes using dual frequency IP meter on different geologic bodies, and different features of apparent amplitude frequency F a and sections of apparent resistivity ρ a are obtained. Of them, medium resistivity, high IP features are displayed above the uranium molybdenum ore body, and low resistivity, high IP effect are displayed above the gold ore body of fractured altered rock type, and ground water enriched sections show low resistivity,negative amplitude frequency. Checking results indicate that F a of uranium molybdenum ore body with commercial grade ranges from 3% to 6%, that with high grade is 6% and the maximum value may reach 15%. Gold orebody with gold grade higher than 5×10 -6 has the F a value of 3%-6%. Aquifer has F a of negative value,and its apparent resistivity is lower than 30 Ω·m.

关 键 词：双频激电法 视幅频率 视电阻率 地质勘查 

分 类 号：P631.324[天文地球—地质矿产勘探]