本文選題：磁法勘探 + 電法勘探��； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：磁法勘探是物探方法中理論最成熟、工作效率最高、成本最低的方法之一,在找礦勘查中得到廣泛的應(yīng)用。其主要應(yīng)用于尋找含磁性礦物的金屬以及非金屬礦床、勘查區(qū)域地質(zhì)構(gòu)造、含油氣構(gòu)造及煤田構(gòu)造等。電法勘探應(yīng)用范圍也十分廣泛,無論在金屬與非金屬的固體勘查中,還是在尋找地下水資源、油氣礦藏和地?zé)岱矫?都獲得了成功的應(yīng)用。電法勘探是以地殼中多數(shù)巖礦石之間存在的電學(xué)性質(zhì)差異為基礎(chǔ),從而查明地下地質(zhì)構(gòu)造或礦產(chǎn)分布。針對本次研究區(qū)的含礦目標(biāo)層的分布特點,展開地面氋精度磁法測量,大功率激電測量以及EH4大地電磁測深的工作,并對其測量成果做了深入的研究。(1)磁法測量成果:數(shù)據(jù)進(jìn)行了化極、延拓處理、水平一階導(dǎo)數(shù)、垂向二階導(dǎo)數(shù)處理、確定了磁異常中心,并推測其埋深,判斷了磁性體的斷裂構(gòu)造線,以及大致確定了磁性體的邊界。磁測數(shù)據(jù)化極后做了小波多尺度分解,用譜分析方法計算了磁源體的平均深度。小波多尺度分解法與常規(guī)的場源分離(化極延拓)的方法相比,從判斷磁源體的埋深角度看,小波多尺度分解法在實際生產(chǎn)應(yīng)用方面更為快捷,更能夠直接指導(dǎo)下步的工作安排。(2)大功率激電測量與EH4大地電磁測深成果:結(jié)合地質(zhì)資料和化探資料,圈定了物探異常找礦靶區(qū),大致查明了與硫化物有關(guān)的銀多金屬礦(化)體的空間分布特征。在綜合分析物探資料的基礎(chǔ)上,圈定具有一定規(guī)模的高磁局部異常13處、具有找礦意義的高阻高極化異常3處,并且推斷本區(qū)的構(gòu)造以北東走向的斷裂為主,北西走向的斷裂為次;區(qū)內(nèi)淺部存在多條規(guī)模較大的巖脈;深部隱伏有中酸性巖基。利用磁法勘探與電法勘探相結(jié)合、激電測深與EH4大地電磁測深相結(jié)合的多種物探方法,在找尋磁鐵礦與多金屬礦方面,組合物探方法起到了相輔相成,相互印證的作用。并提出了“找礦重點地段進(jìn)行大比例尺物探測量,總結(jié)本區(qū)的成礦規(guī)律,優(yōu)選找礦靶位”的建議。通過鉆孔驗證情況,確認(rèn)了綜合物探方法找礦的有效性與合理性,為其它同類型地區(qū)找礦提供借鑒,具有一定現(xiàn)實意義。
[Abstract]:Magnetic exploration is one of the most mature methods in geophysical exploration, which has the highest efficiency and lowest cost, and has been widely used in prospecting.It is mainly used in the exploration of metallic and nonmetallic deposits containing magnetic minerals, exploration of regional geological structures, petroliferous structures and coalfield structures.The application scope of electrical exploration is also very wide. It has been successfully applied in solid exploration of metal and non-metal, groundwater resources, oil and gas deposits and geothermal resources.Electrical prospecting is based on the difference of electrical properties between most rocks and ores in the crust, thus the underground geological structure or the distribution of mineral resources can be ascertained.In view of the distribution characteristics of the ore-bearing target layer in this study area, the work of ground precision magnetic survey, high-power IP survey and EH4 magnetotelluric sounding is carried out.The measurement results are as follows: the data are processed by polarity, extension, horizontal first derivative, vertical second derivative, and the center of magnetic anomaly is determined, and its buried depth is estimated.The fracture structure line of the magnetic body and the boundary of the magnetic body are determined.The wavelet multiscale decomposition is made after the polarity of magnetic data is measured, and the mean depth of magnetic source is calculated by spectral analysis method.Compared with the conventional method of field source separation (polarization continuation), the wavelet multiscale decomposition method is more efficient in practical application from the perspective of determining the buried depth of magnetic source body.The results of high power IP survey and EH4 magnetotelluric sounding are as follows: combined with geological and geochemical data, geophysical exploration anomaly prospecting target area is delineated.The spatial distribution characteristics of silver polymetallic ore bodies related to sulphides are roughly identified.On the basis of comprehensive analysis of geophysical data, 13 high magnetic local anomalies with a certain scale and 3 high resistivity and high polarization anomalies with prospecting significance are delineated, and it is inferred that the faults in the north to east strike of the structures in this area are mainly faults.The faults in the NW strike are secondary, there are many larger veins in the shallow part of the area, and there are some intermediate-acid rock bases in the deep.With the combination of magnetic prospecting and electrical exploration, and the combination of IP sounding and EH4 magnetotelluric sounding, the combined geophysical prospecting methods play a complementary and mutually corroborating role in finding magnetite and polymetallic ore.The suggestion of "large scale geophysical survey in key ore prospecting area, summary of metallogenic law in this area and optimum dressing and prospecting target" is put forward.The validity and reasonableness of comprehensive geophysical prospecting method are confirmed by drilling verification, and it is of practical significance to provide reference for other prospecting in the same type of areas.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.2;P631

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本文編號：1737734