| 井间电磁波层析成像中的高精度时间域正演计算 |
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| 引用本文： | 林树海,赵立英.井间电磁波层析成像中的高精度时间域正演计算[J].地球科学,2007,32(4):469-473. |
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| 作者姓名： | 林树海 赵立英 |
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| 作者单位： | 1.地质过程与矿产资源国家重点实验室和地下信息探测技术与仪器教育部重点实验室, 北京 100083 |
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| 基金项目： | 北京市重点学科建设项目
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教育部留学回国人员科研启动基金
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中国地质大学校科研和教改项目 |
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| 摘 要： | 为提高井间电磁波层析成像的分辨率, 正演计算中需保持较高的计算精度.本文正演计算中采用时间域伪谱(PSTD) 法模拟井间电磁波的传播.该算法在时间域有限差分(FDTD) 法的基础上采用快速傅立叶变换(FFT) 计算麦克斯韦方程中的空间导数.该算法除了具备时间域有限差分法的优点外, 在计算条件完全相同的情况下, 计算精度明显高于时间域有限差分法.时间域伪谱法的正演计算为井间电磁波高分辨率层析成像奠定了重要基础.
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| 关 键 词： | 时间域有限差分 时间域伪谱法 正演计算 层析成像 |
| 文章编号： | 1000-2383（2007）04-0469-05 |
| 收稿时间： | 2007-04-12 |
| 修稿时间： | 2007-04-12 |
High Precision Time Domain Forward Modeling for Crosshole Electromagnetic Tomography |
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| LIN Shu-hai,ZHAO Li-ying.High Precision Time Domain Forward Modeling for Crosshole Electromagnetic Tomography[J].Earth Science-Journal of China University of Geosciences,2007,32(4):469-473. |
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| Authors: | LIN Shu-hai ZHAO Li-ying |
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| Institution: | 1.State Key Laboratory of Geologiccd Processes and Mineral Resources; Geodection Laboratory of the Ministry of Education, Beijing 100083, China; 2. School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China; 3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China ;4. School of Applied Science, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | In order to improve the resolution of crosshole electromagnetic tomography, high precision of forward modeling is necessary. A pseudo-spectral time domain (PSTD) forward modeling was used to simulate electromagnetic wave propagation between two boreholes. The PSTD algorithm is based on finite difference time domain (FDTD) method and employs fast Fourier transform (FFT) to calculate spatial derivatives in Maxwell′s equations. Besides having the strongpoints of FDTD method, PSTD algorithm also demonstrates higher calculation precision than FDTD method under the same calculation condition. The PSTD forward modeling has laid important foundation of crosshole electromagnetic high-resolution tomography. |
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| Keywords: | finite difference time domain method pseudo-spectral time domain algorithm forward modeling tomography |
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