| 李静和.起伏地形频率域可控源电磁二维快速正反演[J].地质与勘探,2018,54(2):325-331 |
| 起伏地形频率域可控源电磁二维快速正反演 |
| Fast 2D forward modeling and inversion of CSEM with topography in the frequency domain |
| 投稿时间：2017-01-06 修订日期：2017-04-12 |
| DOI：10.12134/j.dzykt.2018.02.010 |
| 中文关键词: 起伏地形 频率域可控源 体积分模拟 对比源 快速正反演 |
| 英文关键词: Topography, frequency domain CSEM, IE, CSI, fast forward and inverse solvers |
| 基金项目:国家自然科学基金项目（编号：41604097）、国家博士后科学基金（编号：2016M592611）和桂林理工大学博士后科学基金联合资助 |
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| 中文摘要: |
| 起伏地形频率域可控源电磁正反演研究受到众多学者的关注和重视，目前普遍实用的为未考虑地形的二维正反演算法程序。本文基于积分方程法正演和多场源、多频率、对比源反演算法，开展起伏地形条件下频率域可控源电磁二维快速正反演研究。通过引入层状参考模型、将地形与目标体整体作为异常场剖分区域，实现起伏地形可控源电磁正反演计算。针对包含地形在内的大尺度剖分区域引起的大型计算代价问题，采用快速傅里叶算法提高正反演计算效率。通过与现有正反演算法进行模型算例对比，验证了本文采用方法的可行性与有效性。 |
| 英文摘要: |
| Research on forward modeling and inversion algorithms for frequency domain CSEM with topography is receiving much attention. While the 2-D codes of them that are commonly used do not consider topography. In this paper, the integral equation method is used in forward modeling and the multiple-frequency contrast source is adopted in inversion, then both are incorporated into development of a fast solver for CSEM with topography. By using a layered medium reference model and integrating the topography and the targeted object into one calculation domain, it is possible to realize the aim aforementioned. The FFT algorithm is also used to accelerate the computation caused by expansion of the calculated domain. Numerical examples demonstrate that the fast forward and inverse solvers for 2-D CSEM with topography presented in this paper are feasible and effective. |
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