地面及井中高精度磁测联合反演解释在四川平川铁矿勘查中的应用  

Application of Joint Inversion and Interpretation of Surface and Borehole High-Precision Magnetic Data to the Pingchuan Iron-Ore Exploration in Sichuan Province

作　　者：杨建华 胡振林 李巡 刘双[1] YANG Jianhua;HU Zhenlin;LI Xun;LIU Shuang(Institute of Geophysics&Geomatics,China University of Geosciences,Wuhan,Hubei 430074)

机构地区：[1]中国地质大学地球物理与空间信息学院,湖北武汉430074

出　　处：《地质与勘探》2020年第5期1019-1030,共12页Geology and Exploration

基　　金：贵州省科技计划项目(编号:黔科合支撑[2019]2868号);贵州省地矿局地质科研项目(编号:黔地矿科合[2019]2号)联合资助。

摘　　要：四川平川烂纸厂铁矿是我国重要的峨眉山玄武岩建造型铁矿床。通过对平川地区地面高精度磁数据进行化极、向上延拓以及小波分析等处理,圈定了五个磁性体。该区磁性体受南北向断裂控制,异常沿南北向呈狭长串珠条带状分布,产状近直立,埋藏较浅,下沿深度较大。通过与井中磁异常分量Z_a数据联合反演,获得磁性体的深部形态特征,分析了其对应的下延深度,与现已查明矿体的空间展布相吻合。研究结果表明,地面与井中数据联合反演提高了深部目标体分辨能力,为深部矿产资源探测提供了重要的地球物理方法。The Lanzhichang iron-ore mine in Pingchuan,Sichuan Province is an important iron deposit hosted in Emeishan basaltic.For further exploration,five magnetic bodies were delineated by processing of the ground high-precision magnetic data including reduced-to-the-pole,upward continuations and wavelet-analysis in this mine.The magnetic bodies are controlled by NS-trending faults,of which the anomalies are distributed in a narrow and long belt.The orebodies are nearly vertical,with shallow burial and large downward extension.Joint inversion of borehole magnetic data permits to reveal the shape of magnetic bodies at depth,in good consistency with the distributions of the identified ore bodies.This work demonstrates that the joint inversion and interpretation of surface and borehole magnetic data can improve the vertical resolution of magnetic survey,providing a useful tool for exploration of mineral resources in the deep subsurface.

关 键 词：地面高精度磁测 井中磁测 联合反演 磁铁矿 烂纸厂 平川铁矿 四川 

分 类 号：P631.2[天文地球—地质矿产勘探] P618.31[天文地球—地质学]