| 时间域电磁场偏移成像方法研究 |
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| 引用本文： | 杨华,胡文宝.时间域电磁场偏移成像方法研究[J].现代地质,1999,13(4):455-460. |
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| 作者姓名： | 杨华 胡文宝 |
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| 作者单位： | 中国地质大学工程技术学院!北京100083(杨华，桂峰，李金铭)，江汉石油学院!荆州434102(胡文宝) |
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| 基金项目： | 国家自然科学基金!资助项目 (项目号 :494742 19)成果 |
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| 摘 要： | 采用 Gaver-Stehfest( G-S)方法模拟水平电偶极源在不同介质模型中地表面的负阶跃波电磁场响应 ,然后引入逆时序偏移的观点 ,把这些电磁场响应作为实际观测值 ,利用 Stratton-Chu积分公式将其向下偏移 ,对偏移后的电磁场值进行归一化处理并对场值求偏导数 ,重建地下拟地震深度剖面图 ,实现时间域电磁场的偏移成像。选用了均匀介质、含良导和高阻薄层水平均匀层状介质模型以及高阻柱体、断层等模型分别进行计算 ,成像的结果表明能够得到较高质量的地下地电构造图 ,从重建的深度剖面图中可以识别出地下反射界面的位置 ,该图比时间剖面直观。
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| 关 键 词： | 时间域(瞬变) 电磁场 偏移成像 Stratton-Chu积分 归一化 |
MIGRATING AND IMAGING METHOD OF TIME-DOMAIN ELECTROMAGNETIC FIELD |
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| Yang Hua.MIGRATING AND IMAGING METHOD OF TIME-DOMAIN ELECTROMAGNETIC FIELD[J].Geoscience——Journal of Graduate School,China University of Geosciences,1999,13(4):455-460. |
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| Authors: | Yang Hua |
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| Abstract: | In this thesis,the transientelectromagnetic responseson the surface for differentgiven modelsunder the txcitation of a grounded dipole are calculated by using the Gaver- Stehfest( G- S) method,then the authors introduce the concept of reverse- time migration,use Stratton- Chu integral formulas to migrate downward these forward modelling results being used as measured electromagnetic field,and then normalize anddifferentiate the migrated electromagnetic field,reconstruct the pseudo- seismic depth profile,realize the migration and imaging of time- domain electromagnetic field.To testthe migration and imaging method,one homogeneous medium and two layered mediums including a high conductivity orhigh resistivity thin layerare selected for calculating respectively. From the calculation results we can obtain the quality subsurface geoelectric structure map and the locations of reflectors which are better than those in time profile. |
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| Keywords: | time- domain electromagnetic field migrating and imaging Stratton- Chu integrate normalize |
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