【摘要】：當(dāng)前我國正處于工業(yè)化、城鎮(zhèn)化中期階段,對鐵礦石的需求依舊很大。然而數(shù)據(jù)顯示,我國約有70%的鐵礦石依賴進(jìn)口。如何從根本上破解鋼鐵產(chǎn)業(yè)和鐵礦業(yè)受制于人的被動局面,不僅是一個經(jīng)濟問題,更是涉及國家經(jīng)濟安全的戰(zhàn)略性問題。目前我國可開采的鐵礦資源大都埋藏較淺,但開采多年已久面臨老礦山枯竭,外圍及深部找礦將成為新的找礦方向。 本論文首先研究區(qū)內(nèi)鞍山式鐵礦分布區(qū)域已有的地質(zhì)、地球物理等基礎(chǔ)資料總結(jié)、處理、解釋,總結(jié)了鞍山式鐵礦的區(qū)域成礦背景。再選擇了近年工作發(fā)現(xiàn)的超大型隱伏式遼寧大臺溝鐵礦床為例,總結(jié)了礦區(qū)的地質(zhì)背景,并在已有鉆孔約束下進(jìn)行了音頻大地電磁法測深方法有效性驗證。最終選取重、磁、音頻大地電磁測深組合方法,進(jìn)行礦區(qū)深部找礦勘測研究。大臺溝鐵礦礦區(qū)開展了1：1萬地面高精度磁法勘探66km2、1：1萬重力勘探40km2和音頻大地電磁法測深4條,對取得的原始數(shù)據(jù)進(jìn)行了整理、解釋推斷,建立該礦區(qū)的地質(zhì)、地球物理找礦標(biāo)志,為在鞍本地區(qū)進(jìn)行進(jìn)一步查找同類型隱伏鐵礦床提供了技術(shù)支撐。同時使用綜合地球物理信息建立礦區(qū)的深部鐵礦地質(zhì)-地球物理找礦模型,為該鐵礦下一步勘查工作提供指導(dǎo)。 通過對遼寧大臺溝鐵礦研究表明,高精度重力測量是繼磁法勘探外在研究區(qū)域內(nèi)具有直接尋找鞍山式鐵礦的有效手段,同時具有不受斜磁化影響,能直接指導(dǎo)鉆探工作。大地電磁工作形成電阻率反演斷面圖能圈定出深部隱伏礦體賦存特征,對鉆探工作具有補充和指導(dǎo)意義。 本文在已有的地質(zhì)、鉆探和音頻大地電磁測深結(jié)果資料的約束下,采用人機交換方式,進(jìn)行了重磁2.5D反演,勾勒出大臺溝鐵礦體的立體模型,反映了礦體的空間展布,直觀顯示了礦體的位置、形態(tài)和走向。從反演結(jié)果可以看出礦體為近是單一厚板狀體,礦體頂端埋深1100～1200,底端埋深3100-3200m,估算遠(yuǎn)景資源量為167.58億萬噸。
[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.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.31;P631

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