微动勘探方法在鸡冠咀矿区外围深部找矿中的应用效果研究  

Application Effect of Microtremor Survey Method in Deep Prospectingat Periphery of Jiguanzui Mining Area

作　　者：徐富文 刘博 蔡恒安 魏克涛 刘冬勤 罗银河[2] Xu Fuwen;Liu Bo;Cai Hengan;Wei Ketao;Liu Dongqin;Luo Yinhe(First Geological Brigade of Hubei Geological Bureau,Daye,Hubei 435000;China University of Geosciences,Chinese Academy of Sciences,Wuhan,Hubei 430074)

机构地区：[1]湖北省地质局第一地质大队,湖北大冶435000 [2]中国地质大学(武汉),湖北武汉430074

出　　处：《资源环境与工程》2022年第5期658-667,共10页Resources Environment & Engineering

基　　金：湖北省大冶市鸡冠咀矿区外围铜金多金属矿预查(2019〔8〕);基于微动勘探方法的铜绿山矿田深部成矿构造与深部找矿关键技术研究(KJ2020-5)。

摘　　要：矿集区复杂的人文干扰给传统物探方法应用于深部探测带来较大限制。将微动(被动源面波)勘探方法应用于鸡冠咀矿区外围深部找矿,采用圆环半径分别为75、150、300、600 m的四重嵌套三角形观测台阵,利用扩展空间自相关法(ESPAC)进行面波频散曲线提取,获得目标区2000 m以浅的视横波速度结构,推断火山岩盆地边界形态及深部大理岩、岩体范围,圈定成矿有利部位。结果显示,28线成果与以往的勘探线剖面成果对应良好,高横波速度区域反映了岩体侵入部位;15线实施的ZK1505孔在孔深1200 m处成功揭露出隐伏大理岩,该钻孔波速测井结果与微动勘探视横波速度剖面成果吻合良好。微动勘探方法由于利用环境中的地震背景噪声作为信号源,具有探测深度大、抗干扰能力强的特点,能很好地适用于人文活动密集、干扰情况复杂的矿集区深部勘探工作。The complex human interference in the ore concentration area brings great restrictions to the application of traditional geophysical methods for deep prospecting.In this paper,the microtremor(natural source surface wave)survey is tentatively applied to the deep prospecting at the periphery of Jiguanzui mining area.The four nested triangular observation array with ring radius of 75,150,300,600 m is used to extract the surface wave dispersion curve by improved extended spatial autocorrelation(ESPAC)method,and the apparent shear wave velocity structure within 2000 m of the target area is obtained,the boundary shape of the basin,the range of deep marble and rock mass are inferred,and the favorable location of mineralization is delineated.The results show that the results of line 28 correspond well with the results of previous exploration profile,and the area with high shear wave velocity indicate the intrusion position of rock mass.In addition,the ZK1505 hole on line 15 successfully exposed the concealed marble at the depth of 1200 m.The results of microtremor survey shear wave velocity profile are in good agreement with the borehole wave velocity logging of ZK1505.The results show that the passive source surface wave exploration method,which uses the seismic background noise in the environment as the signal source,has the characteristics of large detection depth and strong anti-interference ability.It can be well applied to the deep exploration work in the ore concentration area with intensive human activities and complex interference.

关 键 词：深部找矿 微动勘探 扩展空间自相关法 鸡冠咀矿区 

分 类 号：P631.4[天文地球—地质矿产勘探]