大地电磁二维倾子和视倾子模拟及其应用研究

余年; 胡祥云; 王绪本; 李坚

doi:10.3969/j.issn.0258-2724.2014.02.013

大地电磁二维倾子和视倾子模拟及其应用研究

doi: 10.3969/j.issn.0258-2724.2014.02.013

余年^1,2,3,
胡祥云¹,
王绪本³,
李坚²

基金项目:

国家自然科学基金资助项目（41274078）

详细信息

作者简介:
余年（1984-），男，博士，研究方向为工程物探、矿产勘探、深部构造，E-mail：yunian@126.com

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出版历程
- 收稿日期: 2013-04-26
- 刊出日期: 2014-03-25

Two-Dimensional Magnetotelluric Tipper and Apparent Tipper：Simulation and Application

摘要

摘要: 为研究大地电磁倾子的异常响应特征，采用四边形剖分有限元实现了倾子正演计算.对异常体、倾斜断层、静态位移和地形等模型进行数值模拟，完善了视倾子资料的推导和计算，并对倾子和视倾子资料进行了对比分析.在新建铁路丽香线中义隧道音频大地电磁勘探中，利用TE模式的视电阻率和相位，计算得到了视倾子资料.研究结果表明：倾子对异常体横向边界和断层有明显反映；仅在中高频段（频率1 Hz以上）静态位移和地形对倾子有影响，倾子和视倾子资料有较好的对应性；视倾子较好地反映了隧道主要断层、破碎带的位置、规模和倾向等，同时可以反映更多细微的异常结构.
- 大地电磁 /
- 倾子 /
- 视倾子 /
- 二维有限元 /
- 工程勘探
Abstract: In order to analyze abnormal responses of 2D magnetotelluric tipper data, a tipper data forward calculation was developed using the finite element quadrilateral mesh, and a forward numerical simulation of the abnormal body, inclined faults, static effects, and terrains was made based on their theoretical models. The derivation and calculation of the apparent tipper data were improved, and the tipper and apparent tipper were compared. As an application example, the apparent tipper was calculated using the transversal electric (TE)-mode apparent resistivity and phase data during the audio-magnetotelluric (AMT) exploration of the Zhongyi tunnel on the newly built Lijiang-Shangrila railway. The results show that the tipper can reflect the abnormal lateral boundary and fault apparently, and is only affected by the static displacement and topography at mid-high frequency band above 1 Hz, where the tipper and apparent tipper data have a good correspondence. In addition, the apparent tipper data can not only locate the fracture zone of the tunnel and reflect the position, scale, and trend of main faults effectively, but also can reflect the more subtle abnormal structures.
- magnetotellurics /
- tipper /
- apparent tipper /
- 2D finite element /
- engineering exploration

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参考文献(13)

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