井中三分量磁测在旧县铁矿普查中的应用

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英文篇名：Application of Three-component Borehole Magnetometry in General Survey of Jiuxian Iron Deposit 作者：李兆令 ; 王石 英文作者：LI Zhaoling;WANG Shi;No.5 Exploration Institute of Geology and Mineral Resources,Shandong; 关键词：井中磁测 ; 三分量 ; 孔底盲矿 ; 旧县铁矿 英文关键词：Borehole magnetrmetry;;three components;;Jiuxian iron deposit;;blind ore at the bottom of the hole 中文刊名：山东国土资源 英文刊名：Shandong Land and Resources 机构：山东省第五地质矿产勘查院; 出版日期：2019-10-15 出版单位：山东国土资源 年：2019 期：10 基金：山东省国土资源厅地质勘查项目,山东省东平县旧县地区铁矿普查(续作),鲁勘字(2015)23号 语种：中文; 页：47-52 页数：6 CN：37-1411/P ISSN：1672-6979 分类号：P631.2;P618.31

摘要

井中磁测主要是测量钻孔周围空间磁性体的磁场,从而起到找矿或解决某些地质问题的作用。在铁矿普查中,由于钻孔往往穿过或靠近矿体,且矿体与围岩磁性差异较大,因而井中磁测更容易发现孔旁或孔底盲矿。山东省东平县旧县地区铁矿属沉积变质型,围岩均不具有磁性或磁性极弱,具备了磁法找矿的物性基础。该矿床主矿体埋藏较深,矿体较薄,勘探难度较大。而矿体的发现得益于紧密结合的地质与物探资料的二次开发。其中井中三分量磁测对深部矿体的发现起了重要作用。通过对ZK408孔开展井中三分量磁测,准确预测了井底盲矿的存在,为钻孔继续钻进与否的决断提供了可靠依据,在不保证漏掉磁性体的前提下减少了钻探工作量,节约了生产成本。对勘查区内磁性体的赋存状态和空间位置做出了合理推断,为东平县旧县铁矿探明储量提供了地球物理依据,为下一步地质工作提供了参考意见。井中三分量磁测在寻找深部磁性矿体方面具有科学准确的指导作用,为旧县铁矿深部找矿和外围找矿提供了新思路。
        Borehole magnetometry is mainly used to measure the magnetic field of the space magnets around boreholes. It can play a role in prospecting or solving some geological problems. In general survey of iron deposit, it is found that the borehole generally passes through or close to the ore body, and magnetic difference between the ore body and the surrounding rock is large, thus, it is easier to discover the blind ore near the hole by magnetic logging. The iron deposit of Jiuxian area in Dongping county of Shangdong province belongs to sedimentary metamorphic iron deposit. The surrounding rocks have no or very weak magnetic, and have physical basis of magnetic prospecting.The main ore body of this deposit is buried deeply with thin ore bodies, therefore it is difficult to explore. The discovery of the ore body is benefit from the secondary exploitation of geological and geophysical data. Three-component borehold magnetometry plays an important role in deep exploration. Through three-component magnetic logging in ZK408 borehole, the existence of blind ore in bottom hole is accurately predicated, which provides a reliable basis for the determination of drilling continuity, reducing drilling workload and saving production cost without guaranteeing the leakage of magnets, reasonably inferring the occurrence state and spatial location of magnets in exploration area, and evaluating the iron ore reserves in Jiuxian iron deposit of Dongping county. The evaluation provides geophysical basis for further geological work. The three-component magnetic logging in borehole has a scientific and accurate guiding role in searching for deep magnetic ore bodies. Its technical method provides a new idea for deep and peripheral prospecting in Jiuxian iron deposit.

引文

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