| 地形对长偏移距瞬变电磁测深的影响研究(英文) |
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| 引用本文： | 唐新功,胡文宝,严良俊.地形对长偏移距瞬变电磁测深的影响研究(英文)[J].应用地球物理,2011,8(4):277-284. |
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| 作者姓名： | 唐新功 胡文宝 严良俊 |
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| 作者单位： | "油气资源与勘探技术"教育部重点实验室(长江大学) |
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| 基金项目： | supported by National Natural Science Foundation of China (Nos. 40727001, 40774073, and 40774074);the National Basic Research Programs of China (973 Program) (No. 2007CB209607);the Doctoral Program of Higher Research and Special funds (No. 20070489001) |
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| 摘 要： | 用基于张量格林函数的体积分方程法对三维异常体进行瞬变电磁响应的正演模拟,首先在频率域内计算电磁场分量的频率域响应,然后利用快速数字滤波技术将计算结果转换到时间域。设计和计算了水平电偶极子源激发下层状水平地层模型背景下的常见地形如山谷、山峰地形的模型,并考察分别把源和接收器放于这些地形中的瞬变电磁场响应,详细分析了这些地形对长偏移距瞬变电磁测深(LOTEM)的影响。结果表明,山谷和山峰地形对LOTEM的结果均有不同程度的影响。当电偶极子源放在山谷谷底时,地形对观测异常场的畸变非常严重;当接收器放在山谷中时,接收器处地形的影响强烈但该影响在空间和时间上只是局部的。总体来讲,不论山峰地形位于何处,其对LOTEM的影响相对较小。当地形处于发射源与接收器之间时,地形对LOTEM的影响非常小,表明在进行LOTEM勘探时,选择发射源的放置比接收器的位置更加重要,野外勘探是尽量把发射源选择在开阔的平坦位置。
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| 关 键 词： | 三维 地形 瞬变电磁 长偏移距瞬变电磁测深(LOTEM) |
Topographic effects on long offset transient electromagnetic response |
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| Xin-Gong Tang,Wen-Bao Hu,Liang-Jun Yan.Topographic effects on long offset transient electromagnetic response[J].Applied Geophysics,2011,8(4):277-284. |
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| Authors: | Xin-Gong Tang Wen-Bao Hu Liang-Jun Yan |
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| Institution: | 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education, Jingzhou, 434023, China
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| Abstract: | The forward modeling procedure used in this article is formulated with the volume integral equation based on the tensor Green’s
function. The electromagnetic components responses are first calculated in the frequency domain and then transformed to the
time domain by digital filtering. The valley and hill topography with a layered earth is stimulated by a horizontal electric
dipole (HED) transmitter, which is common in field surveys, and the TEM responses are calculated at the transmitter and receivers.
The topography effects on the long offset electromagnetic transient (LOTEM) responses are discussed in detail. The results
show that both valley and hill topography has significant effect on the LOTEM measurement. If the HED is located in the bottom
of a valley, the distortion of the observed anomalous field at distance is severe. A valley at the receiver locations show
a strong effect but are localized in space and time. In general, hill-shaped topography shows smaller effects no matter where
its located. When the topography is located between source and receivers, the influence is negligible. We conclude that the
location of the source is much more important than the receivers and it is critical to put the transmitter in an open flat
area in the field survey. |
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| Keywords: | Three-dimension topography transient electromagnetic long offset transient electromagnetic (LOTEM) |
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