金属矿钻孔雷达探测的数值模拟  

Numerical Simulations of Borehole Radar for Metal Ore Detection

作　　者：刘四新[1] 周俊峰[1] 吴俊军[1] 曾昭发[1] 万洪祥[2] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026 [2]吉恩镍业股份有限公司,吉林磐石132311

出　　处：《吉林大学学报（地球科学版）》2010年第6期1479-1484,共6页Journal of Jilin University：Earth Science Edition

基　　金：国家'863'计划项目(2008AA06Z103);国家自然科学基金项目(40874043)

摘　　要：为了研究钻孔雷达对金属矿的响应特征,利用时域有限差分法(FDTD)对钻孔雷达探测进行了数值模拟。通过对不同形态的金属矿体,包括等球状体、板状体和一个实际矿体的模拟,得到大量模拟结果。球状目标体在剖面上表现为双曲线形态,通过偏移处理可以精确确定目标体的位置。板状矿体被钻孔穿过时,直达波位置发生错动并变弱,反射同相轴向上下延伸;板状矿体未被钻孔穿过时,反射同相轴呈线状。对于实际矿体,不同的钻孔表现出不同的特征,结合左、中、右3个钻孔的探测结果可以判断出目标体的形态,并且可以判断出此目标矿体具有低阻、高介电常数的特性。In order to investigate the response of borehole radar to metal ore,finite difference time domain（FDTD）was applied to borehole radar forward modeling on metal ore detection.Numerous simulated results were obtained for different metal ore-body,such as spherical,planar,and a practical ore-body.Spherical ore-body exhibits hyperbolic curves in profile and exact position can be determined after migration processing.As the planar ore-body is penetrated by the borehole,direct wave is shifted and weakened,andreflection events extend upward and downward.However,when it is not penetrated by the borehole,reflection exhibits a linear characteristic.For the practical ore-body,different boreholes show different signal characters.Combing with the detection from three boreholes,we can deduce the shape of the ore-body,and judge that the ore-body has the characteristic of low-resistivity and high permittivity.

关 键 词：钻孔雷达 金属矿 数值模拟 时域有限差分法 

分 类 号：P631.325[天文地球—地质矿产勘探]