地—井瞬变电磁三维响应特征分析与异常体快速定位方法研究

doi:10.11720/wtyht.2022.1541

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摘要

通过对含异常体的三维地电模型进行系统正演和分析,提出了一种地—井瞬变电磁异常体快速定位方法。在对含异常体的三维地电模型进行正演响应规律分析时发现:纯异常场的X、Y分量曲线零点以及Z分量曲线的极值点与异常体深度对应较好;当异常体的规模、电阻率、埋深发生改变时,X、Y分量曲线形态基本不变;当异常体方位发生变化时,X、Y分量曲线形态发生变化。在此基础上,提出地—井瞬变电磁异常体快速定位方法:首先,依据X、Y曲线的零点确定异常体所在深度;其次,依据X、Y分量曲线形态确定异常体所在象限(90°范围);最后,依据X+Y或者X-Y分量的曲线形态将异常体定位于井周45°范围内。数值试验显示本方法对不同方位异常体模型的定位结果均与设计模型吻合。采用陕北某矿区地—井瞬变电磁实测数据作进一步验证,本文方法推断的结果与实际吻合较好。

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	赵友超
	张军
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	姚伟华
	杨洋
	孙怀凤

关键词 ：地—井瞬变电磁, 时域有限差分, 三维正演, 异常体定位

Abstract：

Through systematic forward modeling and analysis of a 3D geoelectric model containing anomalous bodies, this study proposed a rapid positioning method of anomalous bodies based on the ground-borehole transient electromagnetic (TEM) method. The analysis of the forward modeling response laws of the 3D geoelectric model containing anomalous bodies shows that the zero points of the X and Y component curves and the extreme points of the Z component curve of a pure anomaly field correspond well to the depths of the anomalous bodies; the morphologies of the X and Y component curves are basically unchanged when the sizes, resistivity, and burial depths of the anomalous bodies change but change when the orientations of anomalous bodies change. On this basis, this study proposed the following method to rapidly position anomalous bodies using the ground-borehole TEM method. First, determine the depths of anomalous bodies according to the zero points of the X and Y curves. Next, determine the quadrants (within 90°) of anomalous bodies according to the morphologies of the X and Y component curves. Finally, position anomalous bodies within 45° of boreholes according to the morphologies of the X+Y or X-Y component curves. Numerical experiments show that the positioning results of models of anomalous bodies with different orientations are consistent with those of the model designed in this study. As further verified using the ground-borehole TEM measured data of a mining area in northern Shaanxi, the inference that there is a water-filled goaf to the northwest of the borehole obtained using the method proposed in this study well agrees with the actual situation.

Key words： ground-borehole transient electromagnetic time-domain finite difference 3D forward modeling positioning of anomalous bodies

收稿日期: 2021-09-27 修回日期: 2021-12-12 出版日期: 2022-04-20

ZTFLH:

P631

基金资助:山东省自然科学基金项目(ZR2019MD20);国家自然科学基金项目(42074145);国家自然科学基金项目(42004056)

通讯作者: 张军

作者简介: 赵友超(1997-),男,主要从事地—井瞬变电磁正反演与应用研究工作。Email: 201914579@mail.sdu.edu.cn

引用本文:

赵友超, 张军, 范涛, 姚伟华, 杨洋, 孙怀凤. 地—井瞬变电磁三维响应特征分析与异常体快速定位方法研究[J]. 物探与化探, 2022, 46(2): 383-391.
ZHAO You-Chao, ZHANG Jun, FAN Tao, YAO Wei-Hua, YANG Yang, SUN Huai-Feng. Analysis of 3D ground-borehole TEM response characteristics and rapid positioning method for anomalous bodies. Geophysical and Geochemical Exploration, 2022, 46(2): 383-391.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1541 或 https://www.wutanyuhuatan.com/CN/Y2022/V46/I2/383

Fig.1 模型示意

Table 1 三维模型正演参数

Fig.2 不同电阻率异常体模型的响应曲线

Fig.3 不同规模异常体模型的响应曲线

Fig.4 不同目标体埋深模型响应曲线

Fig.5 不同水平方位模型的响应曲线

Fig.6 区域划分示意

Table 2 X、Y分量幅值对比

Table 3 目标体区域定位

Fig.7 异常体方位示意

Fig.8 -1 纯异常分量模型响应曲线

Fig.8 -2 纯异常分量模型响应曲线

Fig.9 异常体定位结果

Fig.10 采空区所在区域示意

Fig.11 实测总场三分量响应曲线

Fig.12 纯异常场响应曲线

Fig.13 充水采空区定位结果

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