本文選題：砂巖型鈾礦 + 觀測參數(shù)特征分析��； 參考：《東華理工大學(xué)》2015年碩士論文

【摘要】：本文從麥克斯韋方程組出發(fā),研究了瞬變電磁法中心回線裝置一維正反演理論。利用漢克爾變換解決了瞬變電磁響應(yīng)含貝塞爾函數(shù)的問題,并運用Matlab實現(xiàn)相應(yīng)的正演響應(yīng)計算。通過理論模型進行瞬變電磁響應(yīng)模擬,分析均勻半空間與三層地電模型正演響應(yīng)特征,在此基礎(chǔ)上提出了瞬變電磁法理論探測深度計算方式,并分析了理論探測深度與其影響因素之間的關(guān)系。對瞬變電磁法觀測參數(shù)特征進行研究,分析了線圈匝數(shù)、線圈形狀、發(fā)射線圈電阻、接收線圈電阻、供電電流、采樣延時、疊加次數(shù)、增益等觀測參數(shù)對采集數(shù)據(jù)產(chǎn)生的影響。在綜合分析了理論探測深度與其影響因素之間的關(guān)系以及觀測參數(shù)響應(yīng)特征的基礎(chǔ)上,將其應(yīng)用于新疆伊犁盆地南緣砂巖型鈾礦。結(jié)合已有勘探、測井資料中的伽馬、電阻率曲線,選取最優(yōu)觀測參數(shù)進行野外數(shù)據(jù)采集。在數(shù)據(jù)處理過程中,首先分析了瞬變電磁響應(yīng)在利用IX1D軟件處理過程中出現(xiàn)震蕩的原因。定義了解釋深度的概念,并分析了解釋深度影響因素。對比分析了解釋深度與理論探測深度的區(qū)別與聯(lián)系。借助IX1D軟件進行正演計算,分析IX1D解釋深度與瞬變電磁法理論探測深度的關(guān)系。然后將實測數(shù)據(jù)進行關(guān)斷時間校正、濾波去噪后進行反演處理。并對反演結(jié)果進行推斷解釋,取得了較好的應(yīng)用效果。
[Abstract]:Based on Maxwell's equations, the one-dimensional forward and inverse theory of the center loop device of transient electromagnetic method is studied in this paper. The problem of transient electromagnetic response with Bessel function is solved by Hankel transform, and the corresponding forward response calculation is realized by using Matlab. Based on the simulation of transient electromagnetic response by theoretical model, the forward response characteristics of homogeneous half-space and three-layer geoelectric model are analyzed. Based on this, a method for calculating the theoretical detection depth of transient electromagnetic method is proposed. The relationship between the depth of theoretical exploration and its influencing factors is analyzed. The characteristics of observation parameters of transient electromagnetic method are studied. The effects of coil turns, coil shape, transmitting coil resistance, receiving coil resistance, power supply current, sampling delay, superposition times and gain on the data acquisition are analyzed. Based on the comprehensive analysis of the relationship between the theoretical exploration depth and its influencing factors and the response characteristics of the observed parameters, it is applied to the sandstone-type uranium deposits in the southern margin of the Yili Basin, Xinjiang. Combined with the gamma and resistivity curves of existing exploration and logging data, the optimal observation parameters are selected for field data acquisition. In the process of data processing, the cause of transient electromagnetic response oscillation in the process of processing with IX1D software is analyzed. The concept of interpretation depth is defined and the influence factors of interpretation depth are analyzed. The difference and relation between the depth of explanation and the depth of theoretical exploration are compared and analyzed. The relationship between the depth of IX1D interpretation and the theoretical detection depth of transient electromagnetic method is analyzed by means of forward calculation with IX1D software. Then the measured data are corrected by turn-off time, and then filtered and de-noised. The inversion results are inferred and interpreted, and good results are obtained.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P619.14;P631.325

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