辽宁大台沟铁矿深部找矿地质—地球物理应用研究
发布时间：2018-11-24 19:34
【摘要】：当前我国正处于工业化、城镇化中期阶段,对铁矿石的需求依旧很大。然而数据显示,我国约有70%的铁矿石依赖进口。如何从根本上破解钢铁产业和铁矿业受制于人的被动局面,不仅是一个经济问题,更是涉及国家经济安全的战略性问题。目前我国可开采的铁矿资源大都埋藏较浅,但开采多年已久面临老矿山枯竭,外围及深部找矿将成为新的找矿方向。 本论文首先研究区内鞍山式铁矿分布区域已有的地质、地球物理等基础资料总结、处理、解释,总结了鞍山式铁矿的区域成矿背景。再选择了近年工作发现的超大型隐伏式辽宁大台沟铁矿床为例,总结了矿区的地质背景,并在已有钻孔约束下进行了音频大地电磁法测深方法有效性验证。最终选取重、磁、音频大地电磁测深组合方法,进行矿区深部找矿勘测研究。大台沟铁矿矿区开展了1：1万地面高精度磁法勘探66km2、1：1万重力勘探40km2和音频大地电磁法测深4条,对取得的原始数据进行了整理、解释推断,建立该矿区的地质、地球物理找矿标志,为在鞍本地区进行进一步查找同类型隐伏铁矿床提供了技术支撑。同时使用综合地球物理信息建立矿区的深部铁矿地质-地球物理找矿模型,为该铁矿下一步勘查工作提供指导。 通过对辽宁大台沟铁矿研究表明,高精度重力测量是继磁法勘探外在研究区域内具有直接寻找鞍山式铁矿的有效手段,同时具有不受斜磁化影响,能直接指导钻探工作。大地电磁工作形成电阻率反演断面图能圈定出深部隐伏矿体赋存特征,对钻探工作具有补充和指导意义。 本文在已有的地质、钻探和音频大地电磁测深结果资料的约束下,采用人机交换方式,进行了重磁2.5D反演,勾勒出大台沟铁矿体的立体模型,反映了矿体的空间展布,直观显示了矿体的位置、形态和走向。从反演结果可以看出矿体为近是单一厚板状体,矿体顶端埋深1100～1200,底端埋深3100-3200m,估算远景资源量为167.58亿万吨。
[Abstract]:At present, our country is in industrialization, urbanization stage, iron ore demand is still very large. However, data show that China has about 70% of iron ore imports. How to fundamentally solve the passive situation of iron and steel industry and iron mining industry is not only an economic problem, but also a strategic problem involving national economic security. At present, most of the ore resources that can be mined in our country are buried shallowly, but the mining has been faced with the depletion of old mines for many years, so the peripheral and deep prospecting will become a new prospecting direction. In this paper, the geological, geophysical and other basic data in the distribution area of Anshan type iron ore are summarized, processed and interpreted, and the regional metallogenic background of Anshan type iron ore is summarized. Finally, the geological background of the mining area is summarized and the validity of the Audio magnetotelluric sounding method is verified under the constraints of the existing boreholes by selecting the super-large concealed Liaoning Dataigou iron ore deposit which has been discovered in recent years as an example. Finally, the combined method of gravity, magnetic and audio magnetotelluric sounding is selected to investigate the deep prospecting in mining area. In the Datingou iron mine area, 1: 10 000 ground high precision magnetic prospecting has been carried out for 66 km ~ 2 ~ 10 000 gravity exploration 40km2 and 4 Audio magnetotelluric sounding methods. The original data obtained have been sorted out, and the geological features of the mine have been established. Geophysical prospecting marks provide technical support for further searching for the same type of concealed iron deposits in Anben area. At the same time, the geological geophysical prospecting model of deep iron ore in the mining area is established by using the comprehensive geophysical information, which provides guidance for the next exploration of the iron ore. The study on Dataigou Iron Mine in Liaoning Province shows that high precision gravity measurement is an effective means to search for Anshan iron ore directly in the external research area after magnetic exploration and can direct drilling work without the influence of oblique magnetization. The inversion sectional map of resistivity formed by magnetotelluric work can delineate the occurrence characteristics of deep concealed orebodies, which is of supplementary and instructive significance to drilling work. In this paper, under the constraint of existing geological, drilling and audio frequency magnetotelluric sounding data, gravity and magnetic 2.5D inversion is carried out by means of man-machine exchange, and the three-dimensional model of Datingou iron ore body is outlined, which reflects the spatial distribution of ore body. The position, shape and direction of the orebody are shown directly. From the inversion results, it can be seen that the orebody is a single thick plate-like body, with a depth of 1100m ~ 1200m at the top of the orebody and a depth of 3100-3200m at the bottom of the orebody. The estimated potential resource amount is 167.58 million tons.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.31;P631
[Abstract]:At present, our country is in industrialization, urbanization stage, iron ore demand is still very large. However, data show that China has about 70% of iron ore imports. How to fundamentally solve the passive situation of iron and steel industry and iron mining industry is not only an economic problem, but also a strategic problem involving national economic security. At present, most of the ore resources that can be mined in our country are buried shallowly, but the mining has been faced with the depletion of old mines for many years, so the peripheral and deep prospecting will become a new prospecting direction. In this paper, the geological, geophysical and other basic data in the distribution area of Anshan type iron ore are summarized, processed and interpreted, and the regional metallogenic background of Anshan type iron ore is summarized. Finally, the geological background of the mining area is summarized and the validity of the Audio magnetotelluric sounding method is verified under the constraints of the existing boreholes by selecting the super-large concealed Liaoning Dataigou iron ore deposit which has been discovered in recent years as an example. Finally, the combined method of gravity, magnetic and audio magnetotelluric sounding is selected to investigate the deep prospecting in mining area. In the Datingou iron mine area, 1: 10 000 ground high precision magnetic prospecting has been carried out for 66 km ~ 2 ~ 10 000 gravity exploration 40km2 and 4 Audio magnetotelluric sounding methods. The original data obtained have been sorted out, and the geological features of the mine have been established. Geophysical prospecting marks provide technical support for further searching for the same type of concealed iron deposits in Anben area. At the same time, the geological geophysical prospecting model of deep iron ore in the mining area is established by using the comprehensive geophysical information, which provides guidance for the next exploration of the iron ore. The study on Dataigou Iron Mine in Liaoning Province shows that high precision gravity measurement is an effective means to search for Anshan iron ore directly in the external research area after magnetic exploration and can direct drilling work without the influence of oblique magnetization. The inversion sectional map of resistivity formed by magnetotelluric work can delineate the occurrence characteristics of deep concealed orebodies, which is of supplementary and instructive significance to drilling work. In this paper, under the constraint of existing geological, drilling and audio frequency magnetotelluric sounding data, gravity and magnetic 2.5D inversion is carried out by means of man-machine exchange, and the three-dimensional model of Datingou iron ore body is outlined, which reflects the spatial distribution of ore body. The position, shape and direction of the orebody are shown directly. From the inversion results, it can be seen that the orebody is a single thick plate-like body, with a depth of 1100m ~ 1200m at the top of the orebody and a depth of 3100-3200m at the bottom of the orebody. The estimated potential resource amount is 167.58 million tons.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.31;P631
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