本文選題：CSAMT + 激發(fā)極化法�。� 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：激電是常用的電法勘探方法,但針對一些構(gòu)造和巖性復(fù)雜地區(qū)的深部目標(biāo)體存在的測量噪聲嚴(yán)重、電磁信號弱的特點(diǎn),單一的電法勘探手段在解釋推斷時(shí)存在誤差且可信度低、抗干擾能力弱等問題,這嚴(yán)重影響了其在深部礦產(chǎn)資源的探測效果,因而在復(fù)雜構(gòu)造和巖性地區(qū)尋找隱伏型鉛鋅礦急需合適、有效的技術(shù)方法指導(dǎo)找礦,而CSAMT法正好彌補(bǔ)了單一使用激電方法的不足,因此本文對CSAMT與激電綜合尋找鉛鋅礦的應(yīng)用作了研究。本文首先闡述了CSAMT和激發(fā)極化法的發(fā)展?fàn)顩r,再就CSAMT測量中產(chǎn)生畸形數(shù)據(jù)的原因作了分析,并討論了場源效應(yīng)、靜態(tài)效應(yīng)、近場效應(yīng)的校正方法。同時(shí),介紹了Bostick方法與非線性共軛梯度法求解反問題,通過軟件建立不同理論模型,對比分析TE、TM模式的成像規(guī)律,確立以TM模式作為實(shí)測資料的反演模式,驗(yàn)證了所用軟件對解釋推斷的可靠性。然后利用有限單元法建立激發(fā)極化理論正演模型,對正演計(jì)算結(jié)果進(jìn)行阻尼最小二乘反演,分析反演結(jié)果的異常特征及走向,總結(jié)電阻率和極化率成像規(guī)律,為實(shí)測資料反演提供依據(jù)。論文最后以貴州某鉛鋅礦區(qū)為例,結(jié)合礦區(qū)地質(zhì)資料和巖(礦)石物性,確定礦區(qū)三條CSAMT法反演剖面的斷裂構(gòu)造傾向和蝕變帶的位置;根據(jù)激電普查結(jié)果,選取一條擬斷面進(jìn)行激電測深,確定低阻高極化體的異常特征及走向,綜合推斷出可能存在的鉛鋅礦帶或成礦遠(yuǎn)景區(qū)。通過CSAMT和激發(fā)極化法在復(fù)雜構(gòu)造和巖性礦區(qū)的應(yīng)用得到如下結(jié)論:1、CSAMT法中存在的數(shù)據(jù)畸變主要是由靜態(tài)效應(yīng)引起的,通過曲線平移和空間濾波進(jìn)行校正。2、CSAMT層析成像結(jié)果能較好地區(qū)分存在電性差異的巖體、蝕變帶、斷層等異常體,為分析成礦機(jī)制和控礦因素提供依據(jù)。3、激發(fā)極化法反演結(jié)果中電阻率與CSAMT視電阻率剖面的對比可增加異常解釋推斷的依據(jù),極化率為巖(礦石)的異常特征走向提供豐富的信息。4、CSAMT與激發(fā)極化法綜合探測,提高了探測結(jié)果解釋推斷的可信度,體現(xiàn)了綜合模式在復(fù)雜構(gòu)造和巖性地區(qū)探測深部鉛鋅礦的有效性和可行性。
[Abstract]:Induced electricity is a commonly used method of electrical exploration. However, in view of the serious measurement noise and weak electromagnetic signal in some deep target bodies in complex structural and lithologic areas, the single method of electrical exploration has errors and low reliability in interpreting and inferring. The ability of anti-interference is weak, which seriously affects the exploration effect of deep mineral resources. Therefore, it is urgent to find hidden lead-zinc ore in complex tectonic and lithologic areas, which is in urgent need of appropriate and effective technical methods to guide prospecting. The CSAMT method can make up for the shortage of the single IP method, so this paper studies the application of CSAMT and IP to find lead-zinc ore. In this paper, the development of CSAMT and induced polarization method is described, then the causes of abnormal data in CSAMT measurement are analyzed, and the correction methods of field source effect, static effect and near field effect are discussed. At the same time, the Bostick method and the nonlinear conjugate gradient method are introduced to solve the inverse problem. Different theoretical models are established by software, and the imaging laws of the TM model are compared and analyzed, and the inversion model using TM model as the measured data is established. The reliability of the software is verified. Then the forward model of induced polarization theory is established by finite element method, and the damping least square inversion of forward calculation results is carried out. The anomalous characteristics and trend of inversion results are analyzed, and the law of resistivity and polarizability imaging is summarized. It provides the basis for inversion of measured data. Finally, taking a lead-zinc mine area in Guizhou as an example, combined with geological data and petrophysical properties of the mining area, the fault structural tendency and the location of alteration zone of three CSAMT inversion sections in mining area are determined, and according to the results of induced electric survey, A pseudo section is selected for IP sounding to determine the anomalous characteristics and direction of low resistivity and high polarimetric bodies and to infer synthetically the possible lead and zinc ore belts or metallogenic scenic spots. Through the application of CSAMT and induced polarization method in complex tectonic and lithologic mining areas, it is concluded that the data distortion in the 1: 1 CSAMT method is mainly caused by static effects. By means of curve translation and spatial filtering, the results of CSAMT tomography can be used to distinguish the abnormal bodies, such as rock mass, altered zone, fault and so on, which have different electrical properties. For the analysis of ore-forming mechanism and ore-controlling factors, the correlation between resistivity and CSAMT apparent resistivity profile in the inversion result of induced polarization method can increase the basis of abnormal interpretation and inference. The polarizability provides abundant information for the abnormal characteristic trend of rock (ore) .4CSAMT and the induced polarization method, which improves the reliability of the interpretation and inference of the exploration results. The effectiveness and feasibility of the integrated model in the exploration of deep lead-zinc deposits in complex tectonic and lithologic areas are demonstrated.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P631.3;P618.4

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本文編號：1893548