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井间电磁波层析成像中的高精度时间域正演计算 被引量:6

High Precision Time Domain Forward Modeling for Crosshole Electromagnetic Tomography
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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. 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.
出处 《地球科学(中国地质大学学报)》 EI CAS CSCD 北大核心 2007年第4期469-473,共5页 Earth Science-Journal of China University of Geosciences
基金 北京市重点学科"地球探测与信息技术(XK104910598)"资助 教育部留学回国人员科研启动基金项目 中国地质大学(北京)校内基金项目
关键词 时间域有限差分 时间域伪谱法 正演计算 层析成像 finite difference time domain method pseudo-spectral time domain algorithm forward modeling tomography.
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参考文献13

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