| 基于深埋管线探测的井中磁梯度方法 |
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| 引用本文： | 陈军,陈泽元,杨川.基于深埋管线探测的井中磁梯度方法[J].地球科学,2015,40(12):2110-2118. |
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| 作者姓名： | 陈军 陈泽元 杨川 |
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| 作者单位： | 1.中国地质大学地球物理与空间信息学院, 湖北武汉 430074 |
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| 摘 要： | 目前, 井中磁梯度方法是深埋金属管线常用的探测方法之一, 但是存在理论不够完善及缺乏定量分析方法等问题.研究内容包括3个方面: (1)从无限长水平圆柱体的磁场强度入手, 通过坐标系的转换, 推导出地面探测和井中探测的磁场水平分量、垂直分量的关系, 进一步推导出管线的井中磁梯度公式; (2)根据磁梯度公式模拟出梯度值随有效磁化倾角及孔位的变化情况; (3)通过对模型正演数据的统计分析确定了3种关系式: 极值比与有效磁化倾角之间的关系式、管线的水平位置和磁梯度极值间的孔深距离与有效磁化倾角的关系式、磁梯度极值的绝对值较大者和管线埋深之间的距离与极值距间的比值和有效磁化倾角的关系式.这3种关系式组成了管线埋深及水平位置的估算公式.最后, 通过实例来估算了管线的埋深和平面位置, 根据估算结果进行的正演结果表明了该方法的可行性.
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| 关 键 词： | 井中 磁梯度 深埋管线 管线探测 极值距 物探 |
| 收稿时间： | 2015-04-11 |
Borehole Magnetic Gradient Method Based on Detection of Deep Underground Pipeline |
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| Abstract: | At present, borehole magnetic gradient is one of the commonly used methods for the detection of deeply buried metal pipelines, which is controversial due to its unsystematic theoretic basis and absence of quantitative analysis. In view of these challenges, this paper aims to present our study involving the following three aspects. (1) The relationships of the vertical component, horizontal component between the magnetic fields of surface and boreholes were derived, and the borehole magnetic gradient formula of deep underground pipeline was deduced, starting from the strength of the magnetic field of infinite horizontal cylinder and the transformation of coordinate system. (2) The relationship of the magnetic gradient changes with the inclination of effective magnetization and the position of hole was simulated according to the formula of magnetic gradient. (3) Three kinds of relationship were determined based on the statistical analysis of the forward modeling data, namely, (a) the relationship between maximum ratio of magnetic gradient and the inclination of magnetic gradient, (b) the relationship of the horizontal position of deep underground pipelines, the extreme distance of magnetic gradient and the inclination of magnetic gradient, (c) the relationship of the ratio of distance between the depth of deep underground pipelines, the depth corresponding to the maximum absolute value of magnetic gradient, the extreme distance of magnetic gradient with the inclination of magnetic gradient. These relationships constitute the estimation formula to estimate the depth and horizontal position of deep underground pipelines. Finally, an example of estimating the depth and horizontal position of deep underground pipeline is given. The feasibility of the method is shown by the results of forward modeling based on the estimation results. |
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