瞬变电磁法在伊犁某砂岩型铀矿中的应用研究

发布时间：2018-04-21 18:01

本文选题：砂岩型铀矿 + 观测参数特征分析　；参考：《东华理工大学》2015年硕士论文

【摘要】：本文从麦克斯韦方程组出发,研究了瞬变电磁法中心回线装置一维正反演理论。利用汉克尔变换解决了瞬变电磁响应含贝塞尔函数的问题,并运用Matlab实现相应的正演响应计算。通过理论模型进行瞬变电磁响应模拟,分析均匀半空间与三层地电模型正演响应特征,在此基础上提出了瞬变电磁法理论探测深度计算方式,并分析了理论探测深度与其影响因素之间的关系。对瞬变电磁法观测参数特征进行研究,分析了线圈匝数、线圈形状、发射线圈电阻、接收线圈电阻、供电电流、采样延时、叠加次数、增益等观测参数对采集数据产生的影响。在综合分析了理论探测深度与其影响因素之间的关系以及观测参数响应特征的基础上,将其应用于新疆伊犁盆地南缘砂岩型铀矿。结合已有勘探、测井资料中的伽马、电阻率曲线,选取最优观测参数进行野外数据采集。在数据处理过程中,首先分析了瞬变电磁响应在利用IX1D软件处理过程中出现震荡的原因。定义了解释深度的概念,并分析了解释深度影响因素。对比分析了解释深度与理论探测深度的区别与联系。借助IX1D软件进行正演计算,分析IX1D解释深度与瞬变电磁法理论探测深度的关系。然后将实测数据进行关断时间校正、滤波去噪后进行反演处理。并对反演结果进行推断解释,取得了较好的应用效果。
[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.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P619.14;P631.325

【参考文献】