本文選題：時(shí)間域航空電磁 + 激電效應(yīng)��； 參考：《吉林大學(xué)》2017年碩士論文

【摘要】：航空瞬變電磁法(Airborne transient electromagnetic,簡(jiǎn)稱ATEM)憑借其速度快、成本低和便捷高效,能夠完成傳統(tǒng)地面電磁法難以完成的地形條件復(fù)雜、氣候環(huán)境惡劣地區(qū)的資源和環(huán)境勘查工作。目前,航空瞬變電磁法在國(guó)內(nèi)外均有較大的發(fā)展,特別是近幾十年來(lái)隨著航空瞬變電磁系統(tǒng)的發(fā)展和數(shù)據(jù)采集精度的提高,地球物理工作者經(jīng)常在晚期時(shí)間道航空瞬變電磁響應(yīng)中發(fā)現(xiàn)符號(hào)反轉(zhuǎn)現(xiàn)象,經(jīng)過(guò)學(xué)者們的研究發(fā)現(xiàn),認(rèn)為該現(xiàn)象是由于激發(fā)極化效應(yīng)引起的。然而,傳統(tǒng)的電阻率反演方法無(wú)法對(duì)該類(lèi)航空瞬變電磁數(shù)據(jù)進(jìn)行有效地處理解釋和正確地反演。早期研究過(guò)程中通常直接將符號(hào)反轉(zhuǎn)部分的數(shù)據(jù)直接剔除,僅處理解釋早期正響應(yīng)部分?jǐn)?shù)據(jù),該方法必然導(dǎo)致深部地球物理信息丟失和電阻率反演結(jié)果的失真。近幾年,關(guān)于航空瞬變電磁激電參數(shù)的反演已成為航空電磁法的研究熱點(diǎn)之一,有效地解決該問(wèn)題對(duì)于航空電磁法的發(fā)展和國(guó)民經(jīng)濟(jì)的增長(zhǎng)具有雙重意義。本文主要研究?jī)?nèi)容為層狀介質(zhì)航空瞬變電磁激電效應(yīng)的正反演。本文首先介紹激發(fā)極化法的電化學(xué)理論,展示兩種典型的激發(fā)極化模型。另外,引入目前被廣泛使用的Cole-Cole模型,對(duì)其進(jìn)行適當(dāng)?shù)淖儞Q,給出幾種典型巖礦石的激電參數(shù)取值范圍,分析巖礦石電導(dǎo)率的頻率特性。這些為后續(xù)的研究奠定了理論基礎(chǔ)。接著本文研究航空瞬變電磁激電效應(yīng)對(duì)電磁擴(kuò)散的影響,給出全空間層狀模型任意位置的頻率域電場(chǎng)分量,根據(jù)歐姆定律得到頻率域電流密度響應(yīng),通過(guò)對(duì)Cole-Cole模型的分解又可以得到頻率域感應(yīng)電流密度和頻率域極化電流密度;利用正余弦變換可以將頻率域電流密度轉(zhuǎn)換為時(shí)間域電流密度。通過(guò)分析感應(yīng)電流密度、極化電流密度和總電流密度的時(shí)間域變化特征,研究極化介質(zhì)中電磁擴(kuò)散特征,并研究分析感應(yīng)電流和極化電流的充放電過(guò)程,合理解釋極化介質(zhì)出現(xiàn)符號(hào)反轉(zhuǎn)現(xiàn)象。通過(guò)研究不同充電率和電導(dǎo)率極化模型中的電磁擴(kuò)散特征,得出不同激電參數(shù)對(duì)電磁擴(kuò)散的影響,進(jìn)一步加深對(duì)航空瞬變電磁激電效應(yīng)的認(rèn)識(shí)。為后續(xù)章節(jié)的正演模擬研究提供理論基礎(chǔ)。針對(duì)航空瞬變電磁激電響應(yīng)正演模擬,本文以水平圓形回線源為例,給出層狀極化模型在水平圓形回線中心處垂直磁場(chǎng)表達(dá)式,利用正余弦變換計(jì)算航空瞬變電磁激電效應(yīng)的階躍響應(yīng)和脈沖響應(yīng),通過(guò)卷積技術(shù)計(jì)算得到任意波形的航空瞬變電磁激電響應(yīng),研究分析不同激電參數(shù)對(duì)航空瞬變電磁激電響應(yīng)的影響。通過(guò)對(duì)層狀極化模型的正演模擬研究,合理地解釋航空瞬變電磁響應(yīng)中出現(xiàn)多次符號(hào)反轉(zhuǎn)的現(xiàn)象。最后本文對(duì)航空瞬變電磁激電參數(shù)的反演進(jìn)行研究,采用經(jīng)典的Occam反演方法,首先介紹Occam反演方法的基本理論,反演過(guò)程中對(duì)Cole-Cole模型參數(shù)進(jìn)行合理的范圍約束,提高了反演的穩(wěn)定性,也一定程度上降低了反演的多解性。通過(guò)對(duì)幾種典型理論層狀極化模型的反演研究,給出本文反演算法的優(yōu)點(diǎn)及其局限性。綜合本文研究成果可為今后的三維航空瞬變電磁激電效應(yīng)正反演研究工作奠定良好的基礎(chǔ),同時(shí)也對(duì)進(jìn)一步認(rèn)識(shí)航空瞬變電磁法中激電效應(yīng)提供幫助,具有一定的理論研究意義。
[Abstract]:Airborne transient electromagnetic (ATEM), with its fast speed, low cost and convenient and efficient, can complete the complex terrain conditions that the traditional ground electromagnetic method is difficult to complete, and the resources and environmental exploration in poor climate and environment. In the last few decades, with the development of the aeronautical transient electromagnetic system and the improvement of the precision of data acquisition, geophysics often found the phenomenon of sign reversal in the transient electromagnetic response of the late time channel. After the study of the scholars, it was found that the phenomenon was caused by the excitation polarization effect. However, the traditional resistivity inverse was found. The method can not effectively deal with the interpretation and correct inversion of this kind of aero transient electromagnetic data. In the early research process, the data of the reverse part of the symbol are directly eliminated and only the early positive response of the data is explained. This method will inevitably lead to the loss of the physical information in the deep earth and the distortion of the resistivity inversion results. In recent years, the inversion of the parameters of the aero transient electromagnetic excitation has become one of the hot topics in the aero electromagnetic method. The effective solution to the problem is of double significance to the development of the aero electromagnetic method and the growth of the national economy. The main research content of this paper is the positive inversion of the transient electromagnetic excitation effect of layered medium. The first part is the introduction of this paper. The electrochemistry theory of the excitation polarization method shows two typical excitation polarization models. In addition, the Cole-Cole model, which is widely used, is introduced, and the range of the parameter value of several typical rock ores is given and the frequency characteristics of the electrical conductivity of rock ore are analyzed. These have laid a theoretical foundation for the follow-up study. In this paper, the influence of the aeronautical transient electromagnetic excitation effect on the electromagnetic diffusion is studied. The frequency domain electric field component of any space layered model is given. The frequency domain current density response is obtained according to Ohm's law. The frequency domain and frequency domain polarization current density can be obtained by the decomposition of the Cole-Cole model. The current density of the frequency domain can be converted into a time domain current density by the positive cosine transformation. By analyzing the characteristics of the induced current density, polarization current density and the time domain of the total current density, the characteristics of the electromagnetic diffusion in the polarized medium are studied. The charge discharge process of the induced current and polarization current is studied and analyzed, and the polarization medium appears reasonably. By studying the characteristics of the electromagnetic diffusion in the polarization model of different charge rate and conductivity, the influence of different excitation parameters on the electromagnetic diffusion is obtained, and the understanding of the effect of the aero transient electromagnetic excitation is further deepened. The theoretical basis for the forward simulation of the subsequent chapters is provided. In this paper, taking the horizontal circular loop source as an example, this paper gives the expression of the vertical magnetic field at the center of the horizontal circular loop, using the positive cosine transform to calculate the step response and impulse response of the aeronautical transient electromagnetic excitation effect, and calculate the transient electromagnetic excitation response of the arbitrary wave form by the convolution technique. The effect of the same excitation parameters on the response of the aeronautical transient electromagnetic excitation. Through the forward modeling of the layered polarization model, the phenomenon of multiple sign reversal appeared in the aero transient electromagnetic response is explained reasonably. Finally, the inversion of the parameters of the aeronautical transient electromagnetic excitation is studied. The classical Occam inversion method is adopted to introduce the Occa first. The basic theory of M inversion method is that the parameters of Cole-Cole model are restricted reasonably in the inversion process, the stability of the inversion is improved and the multiple solvability of the inversion is reduced to a certain extent. The advantages and limitations of the inverse algorithm in this paper are given by the inversion of several typical theoretical layered polarization models. The results can lay a good foundation for the forward and forward research of the three dimensional transient electromagnetic excitation effect and provide some theoretical significance for further understanding of the excitation effect in the aero transient electromagnetic method.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：P631.326

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 傅良魁,劉若谷;時(shí)間域非線性激電效應(yīng)的實(shí)驗(yàn)研究[J];桂林冶金地質(zhì)學(xué)院學(xué)報(bào);1989年01期

2 傅良魁,劉若谷;時(shí)間域非線性激電效應(yīng)的實(shí)驗(yàn)研究——金屬模型體實(shí)驗(yàn)結(jié)果[J];桂林冶金地質(zhì)學(xué)院學(xué)報(bào);1990年02期

3 周云鳳;陳鴻雁;;滇中紅層砂巖型銅鉛礦的激電效應(yīng)[J];云南地質(zhì);2013年02期

4 何繼善，王少武，湯井田;直接同時(shí)提取激電效應(yīng)的方波相干法[J];地球物理學(xué)報(bào);1994年S2期

5 羅延鐘;;利用多頻測(cè)量作“變頻法”電磁耦合校正[J];地質(zhì)與勘探;1980年10期

6 何繼善;熊彬;鮑力知;傅國(guó)紅;;直接消除電磁耦合的斬波去耦方法[J];地球物理學(xué)報(bào);2006年06期

7 徐凱軍;石雙虎;周家惠;;三維大地電磁激電效應(yīng)特征研究[J];西北地震學(xué)報(bào);2009年01期

8 朱占升;譚捍東;;考慮激電效應(yīng)的二維大地電磁正演[J];工程地球物理學(xué)報(bào);2011年04期

9 肖宏躍;計(jì)算規(guī)則形體視極化率的PC—1500程序[J];地球科學(xué)與環(huán)境學(xué)報(bào);1991年01期

10 殷長(zhǎng)春，，劉斌;瞬變電磁法三維問(wèn)題正演及激電效應(yīng)特征研究[J];地球物理學(xué)報(bào);1994年S2期

相關(guān)會(huì)議論文 前4條

1 劉明;楊進(jìn);馮居;;巖(礦)石激電效應(yīng)等效模型研究[A];2014年中國(guó)地球科學(xué)聯(lián)合學(xué)術(shù)年會(huì)——專題2：電磁地球物理學(xué)研究應(yīng)用及其新進(jìn)展論文集[C];2014年

2 王慶乙;蔣彬;黃利賢;朱添寶;;偏置頻譜激發(fā)極化法[A];1990年中國(guó)地球物理學(xué)會(huì)第六屆學(xué)術(shù)年會(huì)論文集[C];1990年

3 王世權(quán);王孟霞;;變頻法電磁耦合效應(yīng)校正原理與實(shí)例[A];河南省地質(zhì)調(diào)查與研究通報(bào)2007年卷（上冊(cè)）[C];2007年

4 郭寧寧;昌彥君;何展翔;;帶激電效應(yīng)的海洋可控源電磁法一維正演及反演[A];中國(guó)地球物理2010——中國(guó)地球物理學(xué)會(huì)第二十六屆年會(huì)、中國(guó)地震學(xué)會(huì)第十三次學(xué)術(shù)大會(huì)論文集[C];2010年

相關(guān)碩士學(xué)位論文 前4條

1 閆國(guó)翔;電性源瞬變電磁激電效應(yīng)的正反演方法技術(shù)研究[D];長(zhǎng)安大學(xué);2015年

2 繆佳佳;層狀介質(zhì)航空電磁激電效應(yīng)正反演研究[D];吉林大學(xué);2017年

3 黃逸偉;含激電效應(yīng)的可控源電磁法三維正演及響應(yīng)研究[D];東華理工大學(xué);2017年

4 朱占升;考慮激電效應(yīng)的二維大地電磁反演研究[D];中國(guó)地質(zhì)大學(xué)(北京);2012年

本文編號(hào)：1945750