E-E_x和E-E_φ广域电磁法测量范围

发布时间：2018-06-30 04:23

本文选题：广域电磁法 + 测量范围　；参考：《石油地球物理勘探》2017年06期

【摘要】：应用标量CSAMT方法定义E-E_x广域电磁法的测量范围,场强和视电阻率曲线会出现严重畸变,因此需要重新定义E-E_x广域电磁法的测量范围。本文采用均匀半空间模型,分析天线方向图、电磁场和视电阻率随角度的变化规律,研究E-E_x和E-E_φ广域电磁法的测量范围。结果显示,E-E_x广域电磁法最佳测量范围在发射偶极中垂线两侧30°和轴向两侧20°张角内,E-E_φ广域电磁法最佳测量范围在发射偶极中垂线两侧60°张角内。采用E-E_x测量时,旁侧剖面长度约为垂直收发距的1.15倍,而采用E-E_φ测量时,测线长度可达垂直收发距的3.46倍。建议在发射偶极中垂线两侧30°张角和轴向两侧20°张角范围内采用E-E_x测量方式,在中垂线两侧30°~60°范围内采用E-E_φ测量方式。
[Abstract]:Using scalar CSAMT method to define the measurement range of E-Ex wide area electromagnetic method, the field intensity and apparent resistivity curve will be distorted seriously, so it is necessary to redefine the measurement range of E-E x wide area electromagnetic method. In this paper, the uniform half-space model is used to analyze the variation of antenna pattern, electromagnetic field and apparent resistivity with angle, and the measurement range of E-E _ x and E-E _ 蠁 wide-area electromagnetic method is studied. The results show that the optimum measurement range of E-Ex wide area electromagnetic method is 30 掳on both sides of vertical line and 20 掳angle of axial direction on both sides of vertical line of emission dipole. The optimum measurement range of E-E _ 蠁 wide area electromagnetic method is within 60 掳angle on both sides of vertical line in launching dipole. The length of the side profile is 1.15 times that of the vertical transceiver distance when E-Ex is used, and the length of the measured line is 3.46 times that of the vertical transceiver distance when E-E _ 蠁 is used. It is suggested that E-Ex should be used in the range of 30 掳opening angle on both sides of vertical line and 20 掳angle in axial direction of the dipole, and E-E _ 蠁 measurement mode should be used in the range of 30 掳~ 60 掳on both sides of the vertical line of the transmitting dipole and in the range of 30 掳~ 60 掳on both sides of the vertical line.
【作者单位】：有色金属成矿预测与地质环境监测教育部重点实验室(中南大学);有色资源与地质灾害探测湖南省重点实验室;中南大学地球科学与信息物理学院;
【基金】：国家重点研发计划深地专项(2016YFC0601100) 国家自然科学基金项目(41227803)联合资助
【分类号】：P631.325

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