地质通报2024，Vol.43Issue(9)：1555-1564,10.DOI:10.12097/gbc.2022.09.023
分布式三维广域电磁法在山东齐河—禹城李屯厚覆盖区富铁矿勘查中的应用
Application of distributed 3D wide field electromagnetic method in the exploration of high-grade iron ore in the thick covered area of Litun in Qihe-Yucheng,Shandong Province
摘要
Abstract
In recent years,significant progress has been made in the exploration of high-grade iron ores in the Litun heavy-cover area of Qihe—Yucheng,Shandong Province.But the Cenozoic thickness(900～1100 m)in this area is so large that the magnetic iron ore is deeply buried.The geophysical condition caused by the iron ore is thus abnormally weak,and the prospecting is difficult.To reveal the deep geological structure of high-grade iron ore in the Litun,distributed three-dimensional wide field electromagnetic detection was carried out.The high-order 2n sequence pseudo-random signal was used,which can transmit 49 frequencies at a time and receive at the same time,realize distributed rolling measurement,and obtain the geoelectric characteristics of 2000 m underground.Based on this,a detailed interpretation of the underground geological structure was carried out,and a three-dimensional geological model of the key research area was constructed.The interpretation results were in good agreement with the existing seismic and drilling information.It provides effective geological structure constraints for gravity-magnetic joint inversion.Delineates new prospecting targets in combination with gravity and magnetic characteristics and metallogenic laws.The results show that the distributed three-dimensional wide field electromagnetic method is an effective detection method to obtain the deep geological structure in the heavy-cover area and has a good application prospect.关键词
分布式三维广域电磁法/富铁矿/厚覆盖区/山东Key words
distributed 3D wide field electromagnetic method/high-grade iron ore/thick coverage area/Shandong分类
天文与地球科学引用本文复制引用
朱裕振,张文艳,邵贵航,高志军,汝亮,闫冰,杨洋..分布式三维广域电磁法在山东齐河—禹城李屯厚覆盖区富铁矿勘查中的应用[J].地质通报,2024,43(9):1555-1564,10.基金项目
国家重点研发计划项目《齐河—禹城覆盖区富铁矿体定位预测与增储示范》(编号:2022YFC2903702-03)、山东省省级地质勘查项目《山东省禹城市李屯地区小刘庄铁矿普查》(编号:鲁勘字(2022)25号)、山东省煤田地质局科研专项基金《广域电磁法人机交互快速三维反演成像研究》(编号:鲁煤地科字(2022)19号) （编号:2022YFC2903702-03）
