| 三维CSAMT中的阴影和场源附加效应 |
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| 引用本文： | 汤井田,葛伟男.三维CSAMT中的阴影和场源附加效应[J].物探化探计算技术,2012,34(1):19-26. |
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| 作者姓名： | 汤井田 葛伟男 |
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| 作者单位： | 中南大学地球科学与信息物理学院,湖南长沙,410083 |
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| 基金项目： | 国家高技术研究发展计划（2007AA060601） |
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| 摘 要： | 阴影和场源附加效应将导致对地质构造的错误推断,在实际工作中将导致一定的经济损失。这里通过利用有限单元法数值模拟了阴影和场源附加效应,对比分析均匀半空间中异常体在场源与测线之间不同位置的数值模拟结果,得出了阴影效应影响规律。同时,通过扩大测区范围得出阴影效应的影响区域比异常体本身大得多,并且阴影区域穿过异常体的中心,从中心向两边阴影效应逐渐减弱。通过改变收发距的大小,异常体的埋深以及其形态大小,分析了阴影和场源附加效应的影响程度。
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| 关 键 词： | CSAMT 阴影效应 场源附加效应 |
SHADOW AND SOURCE OVERPRINT EFFECTS IN 3D CSAMT |
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| TANG Jing-tian,GE Wei-nan.SHADOW AND SOURCE OVERPRINT EFFECTS IN 3D CSAMT[J].Computing Techniques For Geophysical and Geochemical Exploration,2012,34(1):19-26. |
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| Authors: | TANG Jing-tian GE Wei-nan |
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| Institution: | (School of Geosciences and Info-physics,Central South University,Changsha 410083,China) |
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| Abstract: | Shadow and source overprint effects will lead to errors in geological structure,and some economic loss in practical work.In this paper,these effects are simulated through finite element method.By analysing numerical simulation results of different models of abnormal body between the source and line in homogeneous half-space,the influence law of shadow effect is obtained,also this paper comes to the conclusion that the area of shadow effect is much more larger than abnormal body and passes the centre of abnormal body,from which to both sides,the shadow falls off gradually.With the changes of the resistivity and size of abnormal body,shadow and source overprint effects are different. |
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| Keywords: | CSAMT shadow effect source overprint effect |
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