本文選題：張量 + CSAMT　； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：可控源音頻大地電磁法是一種頻率域電磁測深方法。其原理是采用人工源發(fā)射交變電流產(chǎn)生交變電磁場,通過觀測電磁響應(yīng)來計(jì)算波阻抗及視電阻率。頻率域可控源大地電磁法沿用了AMT的測量方式,人工場源主要采用電性源,因?yàn)殡娦栽唇▓龇绞胶啽�、電磁場覆蓋面積大、探測深度較大,多用于煤田探測,地?zé)?油氣和固體礦產(chǎn)深部找礦等。傳統(tǒng)測量方式都是采用單一場源測量,近年來多源的張量CSAMT測量逐漸得到重視,由于張量測量需要多個(gè)源的發(fā)射,本文做了多偶極源的特征和張量測量的初步研究。論文首先基于麥克斯韋方程組,推導(dǎo)了水平電偶極源在層狀大地地表的電磁場響應(yīng),編程實(shí)現(xiàn)了CSAMT一維正演,能夠開展地表的場值分布特征的計(jì)算。同時(shí),基于矢量疊加原理,得到了兩個(gè)電偶極子的疊加場源分布特征;再通過電磁場的對稱性,實(shí)現(xiàn)了張量CSAMT一維正演,分析了不同類型地電斷面下的阻抗張量元素和磁傳輸函數(shù)的特征。其次,通過對張量CSAMT測量的分析,研究了張量CSAMT測量的勘探深度、最低工作頻率、收發(fā)距等參數(shù),特別是對不同的發(fā)射源的適宜觀測區(qū)域做了一定的研究,主要分析了目前國內(nèi)外試驗(yàn)研究的十字型源、L型源及旋轉(zhuǎn)偶極發(fā)射裝置的適宜觀測區(qū)域,研究工作對張量CSAMT的實(shí)際測量有一定的參考價(jià)值。論文基于張量CSAMT數(shù)據(jù)的特點(diǎn),本文初步研究了張量CSAMT數(shù)據(jù)處理的一般步驟,主要包括頻譜信息的提取、主抗張量元素的求取和主軸方位的求取,然后求取主軸方向上的視電阻率值并進(jìn)行反演研究。最后,論文采用CSAMT自適應(yīng)的正則化方法實(shí)現(xiàn)一維全資料段的反演,反演結(jié)果能夠較好地反映地電斷面類型。
[Abstract]:Controlled source audio magnetotelluric method is a frequency domain electromagnetic sounding method. The principle is that the alternating electromagnetic field is generated by the alternating current emitted by artificial source, and the wave impedance and apparent resistivity are calculated by observing the electromagnetic response. The frequency domain controllable source magnetotelluric method adopts the method of AMT measurement, and the artificial field source mainly adopts electric source, because the electric source is simple in establishing the field, the electromagnetic field covers a large area, the detection depth is large, and most of them are used for coalfield exploration and geothermal. Deep prospecting of oil, gas and solid minerals. In recent years, Zhang Liang CSAMT measurement with multiple sources has been paid more and more attention. Due to the need for the emission of multiple sources, this paper makes a preliminary study of the characteristics of multi-dipole sources and Zhang Liang measurements. Based on Maxwell's equations, the electromagnetic response of the horizontal electric dipole source on the layered earth surface is deduced, and the CSAMT one-dimensional forward modeling is programmed to calculate the distribution characteristics of the field value on the surface. At the same time, based on the principle of vector superposition, the superposition field distribution characteristics of two electric dipoles are obtained, and the one-dimensional forward modeling of Zhang Liang CSAMT is realized through the symmetry of electromagnetic field. The characteristics of impedance Zhang Liang element and magnetic transfer function under different geoelectric sections are analyzed. Secondly, through the analysis of Zhang Liang CSAMT survey, the exploration depth, the lowest working frequency, the transceiver distance and other parameters, especially the suitable observation area of different emitter sources, are studied, such as the exploration depth, the lowest working frequency, the transceiver distance and so on. This paper mainly analyzes the suitable observation area of cross type source L source and rotating dipole emitter which has been tested and studied at home and abroad. The research work has certain reference value for Zhang Liang CSAMT actual measurement. Based on the characteristics of Zhang Liang CSAMT data, this paper preliminarily studies the general steps of Zhang Liang CSAMT data processing, including the extraction of spectrum information, the extraction of the main anti- element and the direction of the principal axis. Then the apparent resistivity in the principal axis is obtained and the inversion is carried out. Finally, CSAMT adaptive regularization method is used to realize the inversion of one-dimensional full data. The inversion results can well reflect the type of geoelectric section.
【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】：P631.325

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 馮兵;王s，

本文編號：1776801