磁性大定源TEM响应特征及应用研究
发布时间：2018-11-24 11:37
【摘要】：瞬变电磁法(Transient Electromagnetic Methods,简称TEM)因对低阻体反应敏感而在水文地质调查中得到了广泛的应用。磁性大定源TEM以其施工效率高、探测深度大及成本低而成为常用的一种施工方式。论文从瞬变电磁勘探原理出发,研究了磁性大定源的瞬变电磁响应特征,取得了以下成果:(1)以麦克斯韦基本方程为基础,从瞬变电磁理论出发,推导了磁性源瞬变电磁大定源响应计算公式;(2)在平面直角坐标系下,将磁性源的大线框TEM响应剖分成电偶极子瞬变电磁响应叠加,在计算单个电偶极子对坐标系中某一点的响应值后,累加积分求出总响应值;(3)利用二分法,编程计算出磁性源TEM响应的全区视电阻率,针对双解问题,论文通过研究分析,给出了判别方法:早期利用磁场积分判别,晚期则利用中心回线晚期计算法判别;(4)研究了磁性大定源TEM响应的空间分布情况,通过改变线框大小以及模型的电阻率参数值,分析边界影响问题和响应值的变化特征;(5)编写相关计算程序。通过不同地电模型正演和实例验证,表明了本文大定源TEM视电阻率计算程序的稳定性和有效性;研究表明,大定源TEM全区视电阻率计算法能将浅部地层的地电特性较好的反应出来,对电性层的划定效果更好。
[Abstract]:Transient electromagnetic method (Transient Electromagnetic Methods,) is widely used in hydrogeological survey because of its sensitivity to low resistivity body reaction. Magnetic fixed source TEM has become a common construction method because of its high construction efficiency, high detection depth and low cost. Based on the principle of transient electromagnetic exploration, the characteristics of transient electromagnetic response of magnetic source are studied in this paper. The results are as follows: (1) based on Maxwell's basic equation and transient electromagnetic theory, The formula for calculating the response of transient electromagnetic large fixed source of magnetic source is derived. (2) in the plane rectangular coordinate system, the TEM response of the large wire frame of the magnetic source is divided into the superposition of the transient electromagnetic response of the electric dipole. After calculating the response value of a single electric dipole to a point in the coordinate system, the total response value is calculated by the accumulative integral; (3) the whole area apparent resistivity of TEM response of magnetic source is calculated by programming by using dichotomy method. Aiming at the problem of double solution, the paper gives the discriminant method through research and analysis: early discrimination by using magnetic field integral, In the later stage, the central loop was used to calculate the late stage. (4) the spatial distribution of the TEM response of the magnetic large fixed source is studied. By changing the size of the wire frame and the resistivity parameter of the model, the problem of boundary influence and the variation characteristics of the response value are analyzed. (5) the relevant calculation program is compiled. Through the forward modeling of different geoelectric models and the verification of examples, it is shown that the stability and effectiveness of the TEM apparent resistivity calculation program with large fixed source is demonstrated in this paper. The results show that the calculation method of apparent resistivity in the whole area of Dadingyuan TEM can better reflect the geoelectric characteristics of shallow strata, and the delineation effect of electric layer is better.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.325
本文编号：2353553
[Abstract]:Transient electromagnetic method (Transient Electromagnetic Methods,) is widely used in hydrogeological survey because of its sensitivity to low resistivity body reaction. Magnetic fixed source TEM has become a common construction method because of its high construction efficiency, high detection depth and low cost. Based on the principle of transient electromagnetic exploration, the characteristics of transient electromagnetic response of magnetic source are studied in this paper. The results are as follows: (1) based on Maxwell's basic equation and transient electromagnetic theory, The formula for calculating the response of transient electromagnetic large fixed source of magnetic source is derived. (2) in the plane rectangular coordinate system, the TEM response of the large wire frame of the magnetic source is divided into the superposition of the transient electromagnetic response of the electric dipole. After calculating the response value of a single electric dipole to a point in the coordinate system, the total response value is calculated by the accumulative integral; (3) the whole area apparent resistivity of TEM response of magnetic source is calculated by programming by using dichotomy method. Aiming at the problem of double solution, the paper gives the discriminant method through research and analysis: early discrimination by using magnetic field integral, In the later stage, the central loop was used to calculate the late stage. (4) the spatial distribution of the TEM response of the magnetic large fixed source is studied. By changing the size of the wire frame and the resistivity parameter of the model, the problem of boundary influence and the variation characteristics of the response value are analyzed. (5) the relevant calculation program is compiled. Through the forward modeling of different geoelectric models and the verification of examples, it is shown that the stability and effectiveness of the TEM apparent resistivity calculation program with large fixed source is demonstrated in this paper. The results show that the calculation method of apparent resistivity in the whole area of Dadingyuan TEM can better reflect the geoelectric characteristics of shallow strata, and the delineation effect of electric layer is better.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.325
【参考文献】
相关期刊论文 前10条
1 赵广茂;;基于磁偶极子不规则源的瞬变电磁响应计算[J];铁道工程学报;2016年08期
2 韩自强;冯兵;陈红;朱炯;;电性双极源频率域全区视电阻率的计算及应用效果研究[J];地球物理学进展;2016年04期
3 刘尧;李延清;陶鹏飞;胡尊平;;瞬变电磁三维数值模拟进展[J];西部探矿工程;2016年03期
4 姜国庆;程久龙;孙晓云;陈丁;王海彦;;全空间瞬变电磁全区视电阻率优化二分搜索算法[J];煤炭学报;2014年12期
5 裘伟;李享元;程衍富;;基于小波和曲线拟合对瞬变电磁信号去噪的优化[J];现代电子技术;2014年11期
6 黄少华;吴信民;;瞬变电磁法探测深度研究进展[J];江西科学;2013年01期
7 杨海燕;岳建华;;地下瞬变电磁法全区视电阻率核函数算法[J];中国矿业大学学报;2013年01期
8 李文尧;晏冲为;邹振巍;王荣华;;瞬变电磁仪研究进展[J];云南大学学报(自然科学版);2012年S2期
9 李建慧;朱自强;曾思红;刘树才;;瞬变电磁法正演计算进展[J];地球物理学进展;2012年04期
10 欧阳立胜;;地面瞬变电磁法(TEM)研究进展[J];四川地震;2011年04期
，本文编号：2353553
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2353553.html
